Securities and Exchange Commission
                             Washington, D.C. 20549

                                    FORM 10-K

(Mark One)

[X]  Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange
     Act of 1934

                 for the fiscal year ended December 30, 2006 or

[ ]  Transition Report Pursuant to Section 13 or 15(d) of the Securities
     Exchange Act of 1934

            for the transition period from ___________ to ___________

                         Commission file number 0-20388

                                LITTELFUSE, INC.
             (Exact name of registrant as specified in its charter)


                                         
                Delaware                                 36-3795742
     (State or other jurisdiction of        (I.R.S. Employer Identification No.)
     incorporation or organization)

       800 East Northwest Highway,
          Des Plaines, Illinois                             60016
(Address of principal executive offices)                 (Zip Code)


                                  847/824-1188
              (Registrant's telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:



                                                                 Name of
                                                              Each Exchange
                                                                On Which
Title of Each Class                                             Registered
- -------------------                                      -----------------------
                                                      
Common Stock, $.01 par value                             The Nasdaq Stock Market


Indicate by check mark if the registrant is a well-known seasoned issuer, as
defined in Rule 405 of the Securities Act.
Yes [X] No [ ]

Indicate by check mark if the registrant is not required to file reports
pursuant to Section 13 or Section 15(d) of the Act.
Yes [ ] No [X]

     Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.
Yes [X] No [ ]

     Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]

     Indicate by check mark whether the registrant is a large accelerated filer,
an accelerated filer, or a non-accelerated filer. See definition of "accelerated
filter and large accelerated filter" in Rule 12b-2 of the Exchange Act (Check
one):
Large accelerated filer [X] Accelerated filer [ ] Non-accelerated filer [ ]

     Indicate by check mark whether the registrant is a shell company (as
defined in Rule 12b-2 of the Exchange Act). Yes [ ] No [X]

     The aggregate market value of 22,335,039 shares of voting stock held by
non-affiliates of the registrant was approximately $767,878,641 based on the
last reported sale price of the registrant's Common Stock as reported on The
Nasdaq Stock Market on July 1, 2006.

     As of February 16, 2007, the registrant had outstanding 22,487,280 shares
of Common Stock.

                      DOCUMENTS INCORPORATED BY REFERENCE


     Portions of the following documents have been incorporated herein by
reference to the extent indicated herein:

     Littelfuse, Inc. Proxy Statement for the 2007 Annual Meeting of
Stockholders (the "Proxy Statement") is incorporated into Part III of this Form
10-K. Littelfuse, Inc. Annual Report to Stockholders for the year ended
December 30, 2006 (the "Annual Report to Stockholders") is incorporated into
Parts II and III of this Form 10-K.


                                        2


                                     PART I

The statements in this Annual Report on Form 10-K, which are not historical
facts are intended to constitute "forward-looking statements" entitled to the
safe-harbor provisions of the Private Securities Litigation Reform Act ("PSRLA")
and that involve risks and uncertainties, including, but not limited to, product
demand and market acceptance, economic conditions, the impact of competitive
products and pricing, product quality problems or product recalls, capacity and
supply difficulties or constraints, coal mining exposures in excess of reserves,
failure of an indemnification for environmental liability, exchange rate
fluctuations, commodity price fluctuations, the effect of the Company's
accounting policies, labor disputes, restructuring costs in excess of
expectations, pension plan asset returns less than assumed, integration of
acquisitions and other risks which may be detailed in the Company's Securities
and Exchange Commission filings.

ITEM 1. BUSINESS

GENERAL

Littelfuse Inc. (the "Company" or "Littelfuse") is the world's leading supplier
of circuit protection products for the electronics industry. The Company
provides the broadest line of circuit protection solutions to worldwide
customers. The Company is also the leading provider of circuit protection for
the automotive industry and the third largest producer of electrical fuses in
North America. The Company operates in three geographic segments which are the
Americas, Europe and Asia-Pacific. The Company manufactures products and sells
to customers in all three segments. There has been and continues to be a shift
in the Company's revenues, and consequently manufacturing, to the Asia-Pacific
segment. Net sales by geographic segment, based upon the origination of the
sales, are as follows:



                         FISCAL YEAR
                       (IN THOUSANDS)
               ------------------------------
                 2006       2005       2004
               --------   --------   --------
                            
Americas       $213,564   $195,974   $234,835
Europe          112,193    114,943    105,278
Asia-Pacific    209,192    156,172    136,270
               --------   --------   --------
  Total        $534,859   $467,089   $476,833
               ========   ========   ========




The Company serves customers in three major product areas of the circuit
protection market: electronic, automotive and electrical. In the electronic
market, the Company supplies leading manufacturers such as Alcatel, Celestica,
Compaq, Delta, Flextronics, Fuji, GE, HP, Huawei, Hughes, IBM, Intel, Jabil,
Legend, LG, Matsushita, Motorola, Nokia, Palm, Quanta, Samsung, Sanmina-SCI,
Sanyo, Selectron, Siemens, Sony and Toshiba. In the automotive market, the
Company's end customers include major automotive manufacturers in North America,
Europe and Asia such as BMW, DaimlerChrysler, Ford Motor, General Motors, Honda
Motor, Hyundai and Toyota. The Company also supplies wiring harness
manufacturers and auto parts suppliers worldwide, including Alcoa, Auto Zone,
Delphi, Lear, Pep Boys, Siemens VDO, Sumitomo, Valeo and Yazaki. In the
electrical market, the Company supplies representative customers such as Abbott,
Carrier, Dow Chemical, DuPont, GE, General Motors, Heinz, International Paper,
John Deere, Lithonia Lighting, Marconi, Merck, Otis Elevator, Poland Springs,
Procter & Gamble, Rockwell and 3M. See "Business Environment: Circuit Protection
Market."

The Company manufactures many of its products on fully integrated manufacturing
and assembly equipment. The Company maintains product quality through a Global
Quality Management System with all manufacturing sites certified under ISO
9001:2000. In addition, several of the Littelfuse manufacturing sites are also
certified under TS 16949 and ISO 14001.

The Company's products are sold worldwide through a direct sales force and
manufacturers' representatives. For the year ended December 30, 2006,
approximately 61.1% of the Company's net sales were to customers outside the
United States (exports and foreign operations).

References herein to "2004" or "fiscal 2004" refer to the fiscal year ended
January 1, 2005. References herein to "2005" or "fiscal 2005" refer to the
fiscal year ended December 31, 2005. References herein to "2006" or "fiscal
2006" refer to the fiscal year ended December 30, 2006.

The Company's annual report on Form 10-K, quarterly reports on Form 10-Q,
current reports on Form 8-K, and all amendments to those reports are currently
available free of charge through the "Investor Relations" section of the
Company's Internet website (http://www.littelfuse.com) as soon as practicable
after such material is electronically filed with, or furnished to, the
Securities and Exchange Commission as well as on the website maintained by the
SEC at http://www.sec.gov. Except as otherwise provided herein, such information
is not incorporated by reference into this annual report on Form 10-K.

BUSINESS ENVIRONMENT: CIRCUIT PROTECTION MARKET


                                        3



The Company serves customers in three major product areas of the circuit
protection market: electronic, automotive and electrical. Net sales by product
area for the periods indicated are as follows:



                         FISCAL YEAR
                       (IN THOUSANDS)
               ------------------------------
                 2006       2005       2004
               --------   --------   --------
                            
Electronic     $365,418   $305,870   $325,617
Automotive      123,620    118,595    113,690
Electrical       45,821     42,624     37,526
               --------   --------   --------
  Total        $534,859   $467,089   $476,833
               ========   ========   ========


ELECTRONIC PRODUCTS

Electronic circuit protection products are used to protect circuits in a
multitude of electronic systems. The Company's product offering includes a
complete line of overcurrent and overvoltage solutions including: (1) fuses and
protectors, (2) positive temperature coefficient, (PTC) resettable fuses, (3)
varistors, (4) polymer electrostatic discharge (ESD) suppressors, (5) discrete
transient voltage suppression (TVS) diodes, TVS diode arrays and protection
thyristors, (6) gas discharge tubes, (7) power switching components, and (8)
fuseholders, blocks and related accessories.

Electronic fuses and protectors are devices that contain an element which melts
in an overcurrent condition. Electronic miniature and subminiature fuses are
designed to provide circuit protection in the limited space requirements of
electronic equipment. The Company's fuses are used in a wide variety of
electronic products, including wireless telephones, consumer electronics,
computers, modems and telecommunications equipment. The Company markets these
products under the following trademarked and brand names: PICO(R) II and NANO2
(R) SMF.

Resettables are positive temperature coefficient (PTC) polymer devices that
limit the current when an overcurrent condition exists and then reset themselves
once the overcurrent condition has cleared. The Company's product line offers
both radial leaded and surface mount products.

Varistors are ceramic-based high-energy absorption devices that provide
transient overvoltage and surge suppression for automotive, telecommunication,
consumer electronics and industrial applications. The Company's product line
offers both radial leaded and multilayer surface mount products.

Polymer electrostatic discharge (ESD) suppressors are polymer-based devices that
protect an electronic system from failure due to rapid transfer of electrostatic
charge to the circuit. The Company's PulseGuard(R) line of ESD suppressors is
used in PC and PC peripherals, digital consumer electronics and wireless
applications.

Discrete diodes, diode arrays and protection thyristors are fast switching
silicon semiconductor structures. Discrete diodes protect a wide variety of
applications from overvoltage transients such as ESD, inductive load switching
or lightning, while diode arrays are used primarily as ESD suppressors.
Protection thyristors are commonly used to protect telecommunications circuits
from overvoltage transients such as those resulting from lightning. Applications
include telephones, modems, data transmission lines and alarm systems. The
Company markets these products under the following trademarked brand names:
TECCOR(R), SIDACtor(R) and Battrax(R).

Gas discharge tubes are very low capacitance devices designed to suppress any
transient voltage event that is greater than the breakover voltage of the
device. These devices are primarily used in telecom interface and conversion
equipment applications as protection from overvoltage transients such as
lightning.

Power switching components are used to regulate energy to various type loads
most commonly found in industrial and home equipment. These components are
easily activated from simple control circuits or interfaced to computers for
more complex load control. Typical applications include heating, cooling,
battery chargers and lighting.

In addition to the above products, the Company is also a supplier of fuse
holders (including OMNI-BLOK(R)), fuse blocks and fuse clips primarily to
customers that purchase circuit protection devices from the Company.


                                       4



AUTOMOTIVE PRODUCTS

Fuses are extensively used in automobiles, trucks, buses and off-road equipment
to protect electrical circuits and the wires that supply electrical power to
operate lights, heating, air conditioning, radios, windows and other controls.
Currently, a typical automobile contains 30 to 100 fuses, depending upon the
options installed. The fuse content per vehicle is expected to continue to grow
as more electronic features are included in automobiles. The Company also
supplies fuses for the protection of electric and hybrid vehicles.

The Company is a primary supplier of automotive fuses to United States, Asian
and European automotive OEMs, automotive component parts manufacturers and
automotive parts distributors. The Company also sells its fuses in the
replacement parts market, with its products being sold through merchandisers,
discount stores and service stations, as well as under private label by national
firms. The Company invented and owns most of the U.S. patents related to the
blade type fuse which is the standard and most commonly used fuse in the
automotive industry. The Company's automotive fuse products are marketed under
the following trademarked brand names: ATO(R), MINI(R), MAXI(TM), MIDI(R),
MEGA(TM) and CablePro(TM).

A majority of the Company's North American automotive fuse sales are made to
wire harness manufacturers that incorporate the fuses into their products. The
remaining automotive fuse sales are made directly to automotive manufacturers
and through distributors who in turn sell most of their products to automotive
product wholesalers, such as warehouse distributors, discount stores and service
stations.

ELECTRICAL PRODUCTS

The Company entered the electrical market in 1983 and manufactures and sells a
broad range of low-voltage and medium-voltage circuit protection products to
electrical distributors and their customers in the construction, original
equipment manufacturers ("OEM") and industrial maintenance and repair operations
("MRO") markets.

Power fuses are used to protect circuits in various types of industrial
equipment and circuits in industrial plants, office buildings and residential
units. They are rated and listed under one of many Underwriters' Laboratories
fuse classifications. Major applications for power fuses include protection from
over-load and short-circuit currents in motor branch circuits, heating and
cooling systems, control systems, lighting circuits and electrical distribution
networks.

The Company's POWR-GARD(R) product line features the Indicator(TM) series power
fuse used in both the OEM and MRO markets. The Indicator(TM) technology provides
visual blown fuse indication at a glance, reducing maintenance and downtime on
production equipment. The Indicator(TM) product offering is widely used in motor
protection and industrial control panel applications.

PRODUCT DESIGN AND DEVELOPMENT

The Company employs scientific, engineering and other personnel to continually
improve its existing product lines and to develop new products at its research
and engineering facilities in Des Plaines, Illinois, Irving, Texas, Swindon, UK,
Dunsen, Germany and Dundalk, Ireland. The Product Technology Department
maintains a staff of engineers, chemists, material scientists and technicians
whose primary responsibility is the design and development of new products.

Proposals for the development of new products are initiated primarily by sales
and marketing personnel with input from customers. The entire product
development process ranges from several months to 18 months based on complexity
of development with continuous efforts to reduce the development cycle. During
fiscal years 2006, 2005 and 2004, the Company expended $18.7 million, $16.7
million and $16.1 million, respectively, on product design and development.

PATENTS, TRADEMARKS AND OTHER INTELLECTUAL PROPERTY

The Company generally relies on patent and trademark laws and license and
nondisclosure agreements to protect intellectual property and proprietary
products. In cases where it is deemed necessary by management, key employees are
required to sign an agreement that they will maintain the confidentiality of the
Company's proprietary information and trade secrets. This information, for
business reasons, is not disclosed to the public.

As of December 30, 2006, the Company owned 161 patents in North America, 89
patents in the European Economic Community and 42 patents in other foreign
countries. The Company has also registered trademark protection for certain of
its brand names and logos. The 161 North American patents are in the following
product categories: 124 electronic, 22 automotive, 15 electrical fuse.


                                       5



New products are continually being developed to replace older products. The
Company regularly applies for patent protection on such new products. Although
in the aggregate the Company's patents are important in the operation of its
businesses, the Company believes that the loss by expiration or otherwise of any
one patent or group of patents would not materially affect its business.

The Company has various patents acquired as part of its acquisition of SurgX
during 2006. These patents are licensed to various companies for which it the
Company receives royalty income. Income received from the licensing of these
patents is not material to the Company's operating results.

License royalties amounted to $0.4 million, $0.5 million and $0.5 million for
fiscal 2006, 2005 and 2004, respectively.

MANUFACTURING

The Company performs the majority of its own fabrication and stamps some of the
metal components used in its fuses, holders and switches from raw metal stock
and makes its own contacts and springs. In addition, the Company fabricates
silicon wafers for certain applications and performs its own plating (silver,
nickel, zinc, tin and oxides). All thermoplastic molded component requirements
used for such products as the ATO(R), MINI(R) and MAXI(TM) fuse product lines
are met through the Company's in-house molding capabilities.

After components are stamped, molded, plated and readied for assembly, final
assembly is accomplished on fully automatic and semi-automatic assembly
machines. Quality assurance and operations personnel, using techniques such as
Statistical Process Control, perform tests, checks and measurements during the
production process to maintain the highest levels of product quality and
customer satisfaction.

The principal raw materials for the Company's products include copper and copper
alloys, heat resistant plastics, zinc, melamine, glass, silver, raw silicon,
solder and various gases. The Company depends upon a sole source for several
heat resistant plastics and zinc. The Company believes that suitable alternative
heat resistant plastics and zinc are available from other sources at prices that
would not have a material adverse effect on the Company. All of the other raw
materials are purchased from a number of readily available outside sources.

A computer-aided design and manufacturing system (CAD/CAM) expedites product
development and machine design and our laboratories test new products, prototype
concepts and production run samples. The Company participates in "Just-in-Time"
delivery programs and with many of its major suppliers and actively promotes the
building of strong cooperative relationships with its suppliers by utilizing
Early Supplier Involvement techniques and involving them in pre-engineering
product and process development.

MARKETING

The Company's domestic sales and marketing staff of over 40 people maintains
relations with major OEMs and distributors. The Company's sales, marketing and
engineering personnel interact directly with the OEM engineers to ensure
appropriate circuit protection and reliability within the parameters of the
OEM's circuit design. Internationally, the Company maintains a sales and
marketing staff of over 96 people and sales offices in The Netherlands, the
U.K., France, Germany, Spain, Ireland, Singapore, Taiwan, Japan, Brazil, Hong
Kong, Korea, China and India. The Company also markets its products indirectly
through a worldwide organization of over 60 manufacturers' representatives and
distributes through an extensive network of electronic, automotive and
electrical distributors.

ELECTRONIC

The Company retains manufacturers' representatives to sell its electronic
products and to call on major domestic and international OEMs and distributors.
The Company distributes approximately one-fourth of its domestic products
directly to OEMs, with the remainder sold through distributors nationwide.

In the Asia-Pacific region, the Company maintains a direct sales staff and
utilizes manufacturers' representatives and distributors in Japan, Singapore,
Korea, Taiwan, China, Malaysia, Thailand, Hong Kong, India, Indonesia,
Philippines, New Zealand and Australia. In Europe, the Company maintains a
direct sales force and utilizes manufacturers' representatives and distributors
to support a wide array of customers.


                                       6



AUTOMOTIVE

The Company maintains a direct sales force to service all the major automotive
OEMs (including the United States manufacturing operations of foreign-based
OEMs) through both the engineering and purchasing departments of these
companies. Twenty-two manufacturers' representatives represent the Company's
products to aftermarket fuse retailers such as Autozone and Pep Boys. In Europe,
the Company uses both a direct sales force and manufacturers' representatives to
distribute its products to BMW, Volvo, Saab, Jaguar, major system suppliers and
other OEMs, as well as aftermarket distributors. In the Asia-Pacific region, the
Company uses both a direct sales force and distributors to supply to major OEM's
and system suppliers.

ELECTRICAL

The Company markets and sells its power fuses through manufacturers'
representatives across North America. These representatives sell power fuse
products through an electrical distribution network comprised of approximately
1,600 distributor buying locations. These distributors have customers that
include electrical contractors, municipalities, utilities and factories
(including both MRO and OEM).

The Company's field sales force (including regional sales managers and
application engineers) and manufacturers' representatives call on both
distributors and end-users (consulting engineers, municipalities, utilities and
OEMs) in an effort to educate these customers on the capabilities and
characteristics of the Company's products.

BUSINESS SEGMENT INFORMATION

The Company has three reportable geographic business segments: Americas, Europe
and Asia-Pacific. For information with respect to the Company's operations in
its three geographic areas for the fiscal year ended December 30, 2006, see
Business Segment Information included as part of "Item 8. Financial Statements
and Supplementary Data" - incorporated herein by reference.

CUSTOMERS

The Company sells to over 10,000 customers worldwide. No single customer
accounted for more than 10% of net sales during the last three years. During the
2006, 2005 and 2004 fiscal years, net sales to customers outside the United
States (exports and foreign operations) accounted for approximately 61.1%, 59.8%
and 58.5%, respectively, of the Company's total net sales.

COMPETITION

The Company's products compete with similar products of other manufacturers,
some of which have substantially greater financial resources than the Company.
In the electronics market, the Company's competitors include AVX, Bel Fuse,
Bourns, Cooper Industries, EPCOS, Raychem Division of TYCO International, San-O
Industrial Corp., and STMicroelectronics. In the automotive market, the
Company's competitors, both in sales to automobile manufacturers and in the
aftermarket, include the Bussmann Division of Cooper Industries, Pacific
Engineering Company, Ltd. and MTA in Italy. The Company licenses several of its
automotive fuse designs to the Bussmann Division of Cooper Industries. In the
electrical market, the Company's major competitors include the Bussman Division
of Cooper Industries and Ferraz Shawmut. The Company believes that it competes
on the basis of innovative products, the breadth of its product line, the
quality and design of its products and the responsiveness of its customer
service in addition to price.

BACKLOG

The backlog of unfilled orders at December 30, 2006, was approximately $85.2
million, compared to $68.5 million at December 31, 2005. Substantially all of
the orders currently in backlog are scheduled for delivery in 2006.

EMPLOYEES

As of December 30, 2006, the Company employed 6,550 persons. Approximately 31
employees in the U.S., 1260 employees in Mexico, 97 employees in Ireland and 142
employees in Germany are covered by collective bargaining agreements. The U.S.
agreement expires on March 31, 2008 for 31 employees, the Mexico agreements
expire February 28, 2007 for 890 employees and February 29, 2008 for 370
employees for Matamoros and Piedras Negras respectively, the Ireland agreement
expires March 31, 2009 for 97 employees, and the Germany agreement expires March
31, 2007 for 56 employees and June 30, 2007 for 86 employees. Overall, the
Company has historically maintained satisfactory employee relations and many of
its employees have long experience with the Company.


                                       7



ENVIRONMENTAL REGULATION

The Company is subject to numerous federal, state and local regulations relating
to air and water quality, the disposal of hazardous waste materials, safety and
health. Compliance with applicable environmental regulations has not
significantly changed the Company's competitive position, capital spending or
earnings in the past and the Company does not presently anticipate that
compliance with such regulations will change its competitive position, capital
spending or earnings for the foreseeable future. The Company employs an
environmental engineer to monitor regulatory matters and believes that it is
currently in compliance in all material respects with applicable environmental
laws and regulations, except with respect to its facilities located in Ireland
and Irving, Texas. The Ireland facility was acquired in October 1999 in
connection with the acquisition of the Harris suppression products division.
Certain containment actions have been ongoing and full disclosure with
appropriate agencies in Ireland has been initiated. The Company received an
indemnity from Harris Corporation with respect to these matters. The Irving,
Texas facility lease was assumed in July 2003 in connection with the acquisition
of Teccor Electronics, Inc. The Company is taking the appropriate measures to
bring this facility into compliance with Texas environmental laws, and the
Company also received an indemnity from Invensys plc with respect to this
matter. Heinrich Industries, AG ("Heinrich"), acquired by the Company in May
2004, is responsible for maintaining coal mine shaft entrances and is compliant
with German regulations pertaining to the maintenance of the mines.

ITEM 1A. RISK FACTORS

Our business, financial condition and results of operations are subject to
various risks and uncertainties, including the risk factors we have identified
below. These factors are not necessarily listed in order of importance. We may
amend or supplement the risk factors from time to time by other reports that we
file with the SEC in the future.

Our Industry is Subject to Intense Competitive Pressures

We operate in markets that are highly competitive. We compete on the basis of
price, quality, service and/or brand name across the industries and markets we
serve. Competitive pressures could affect prices we charge our customers or
demand for our products.

We may not always be able to compete on price, particularly when compared to
manufacturers with lower cost structures, especially those with more significant
offshore facilities located where labor and other costs are lower than ours.
Some of our competitors have substantially greater sales, financial and
manufacturing resources and may have greater access to capital than Littelfuse.
As other companies enter our markets or develop new products, competition may
intensify further. Our failure to compete effectively could materially adversely
affect our business, financial condition and results of operations.

We May be Unable to Manufacture and Deliver Products in a Manner that is
Responsive to Our Customers' Needs.

The end markets for our products are characterized by technological change,
frequent new product introductions and enhancements, changes in customer
requirements and emerging industry standards. The introduction of products
embodying new technologies and the emergence of new industry standards could
render our existing products obsolete and unmarketable before we can recover any
or all of our research, development and commercialization expenses on capital
investments. Furthermore, the life cycles of our products may change and are
difficult to estimate.

Our future success will depend upon our ability to manufacture and deliver
products in a manner that is responsive to our customers' needs. We will need to
develop and introduce new products and product enhancements on a timely basis
that keep pace with technological developments and emerging industry standards
and address increasingly sophisticated requirements of our customers. We invest
heavily in research and development without knowing that we will recover these
costs. Our competitors may develop products or technologies that will render our
products non-competitive or obsolete. If we cannot develop and market new
products or product enhancements in a timely and cost-effective manner, our
business, financial condition and results of operations could be materially
adversely affected.

Our Business May be Interrupted by Labor Disputes or Other Interruptions of
Supplies

A work stoppage could occur at certain of our facilities, most likely as a
result of disputes under existing collective bargaining agreements with labor
unions, or in connection with negotiations of new collective bargaining
agreements. In addition, we may experience a shortage of supplies for various
reasons, such as financial distress, work stoppages, natural disasters or
production difficulties that may affect one of our suppliers. A significant work
stoppage, or an interruption or shortage of supplies for any reason, if
protracted, could substantially adversely affect our business, financial
condition and results of operations.


                                       8


Our Revenues May Vary Significantly from Period to Period

Our revenues may vary significantly from one accounting period to another due to
a variety of factors. Some of the principal factors that contribute to these
fluctuations may be: changes in our customers' buying decisions; changes in
demand for our products; our product mix; our effectiveness in managing
manufacturing processes; costs and timing of our component purchases; the
effectiveness of our inventory control; the degree to which we are able to
utilize our available manufacturing capacity; our ability to meet delivery
schedules; general economic and industry conditions; and local conditions and
events that may affect our production volumes, such as labor conditions and
political instability.

Our Ability to Manage Currency or Commodity Price Fluctuations or Shortages is
Limited

As a resource-intensive manufacturing operation, we are exposed to a variety of
market and asset risks, including the effects of changes in foreign currency
exchange rates, commodity prices and interest rates. We have multiple sources of
supply for each of our major commodity requirements. However, significant
shortages that disrupt the supply of raw materials or price increases could
affect prices we charge our customers, our product costs, and the competitive
position of our products and services. We monitor and manage these exposures as
an integral part of our overall risk management program, which recognizes the
unpredictability of markets and seeks to reduce the potentially adverse effects
on our results. Nevertheless, changes in currency exchange rates, commodity
prices and interest rates cannot always be predicted. In addition, because of
intense price competition and our high level of fixed costs, we may not be able
to address such changes even if they are foreseeable. Substantial changes in
these rates and prices could have a substantial adverse effect on our results of
operations and financial condition. For additional discussion of interest rate,
currency or commodity price risk, see "Item 7A. Quantitative and Qualitative
Disclosures about Market Risks."

The Bankruptcy or Insolvency of a Major Customer Could Adversely Affect Us

Certain of our major customers, such as those in the automotive industry, are
suffering financial hardships. The bankruptcy or insolvency of a major customer
could cause a material adverse effect on our business, financial condition and
results of operations. In addition, the bankruptcy or insolvency of a major U.S.
auto manufacturer likely could lead to substantial disruptions in the automotive
supply base, which likely would have a substantial adverse impact on our
business, financial condition and results of operations.

Operations and Supply Sources Located Outside the United States, Particularly in
Emerging Markets, Are Subject to Increased Risks

Our operating activities outside the United States contribute significantly to
our revenues and earnings. Serving a global customer base and remaining
competitive in the global market place may require that we place more production
in countries other than the United States, including emerging markets, to
capitalize on market opportunities and maintain a cost-efficient structure. In
addition, we source a significant amount of raw materials and other components
from third-party suppliers or joint-venture operations in low-cost countries.
Our operations outside the United States could be disrupted by a natural
disaster, labor strike, war, political unrest, terrorist activity or public
health concerns. Operations outside the United States are also subject to
certain regulatory and economic uncertainties including trade barriers and
restrictions on the exchange and fluctuations of currency. As a result, we may
experience disruptions at these operations that could have a material adverse
effect on our business, financial condition and results of operations.

We Engage in Acquisitions and May Encounter Difficulties in Integrating These
Businesses

We are a company that, from time to time, seeks to grow through strategic
acquisitions. We have in the past acquired a number of businesses or companies
and additional product lines and assets. We intend to continue to expand and
diversify our operations with additional acquisitions. The success of these
transactions depends on our ability to integrate the assets and personnel
acquired in these transactions. We may encounter difficulties in integrating
acquisitions with our operations and may not realize the degree or timing of the
benefits that we anticipated from an acquisition.

We Have Closed, Combined, Sold or Disposed of Certain Subsidiaries, Divisions or
Assets, Which in the Past Has Reduced Our Sales Volume and Resulted in
Restructuring Costs

We are a company that, from time to time, seeks to optimize its manufacturing
capabilities and efficiencies through restructurings, consolidations, plant
closings or asset sales. We may make further specific determinations to
consolidate, close or sell additional facilities. Possible adverse consequences
related to such actions may include various charges such as for idle capacity,
disposition costs, severance costs, impairments of goodwill and possibly an
immediate loss of revenues, and other items in addition to normal or attendant
risks and uncertainties. We may be unsuccessful in any of our current or future
efforts to restructure or consolidate our


                                        9



business. Our plans to minimize or eliminate any loss of revenues during
restructuring or consolidation may not be achieved. These activities may have a
material adverse effect upon our business, financial condition or results of
operations.

Environmental Liabilities Could Adversely Impact Our Financial Position

Federal, state and local laws and regulations impose various restrictions and
controls on the discharge of materials, chemicals and gases used in our
manufacturing processes or in our finished goods. These environmental
regulations have required us to expend a portion of our resources and capital on
relevant compliance programs. Under other laws and regulations, we could be held
financially responsible for remedial measures if our current or former
properties are contaminated or if we send waste to a landfill or recycling
facility that becomes contaminated, even if we did not cause the contamination.
We may be subject to additional common law claims if we release substances that
damage or harm third parties. In addition, future changes in environmental laws
or regulations may require additional investments in capital equipment or the
implementation of additional compliance programs in the future. Any failure to
comply with new or existing environmental laws or regulations could subject us
to significant liabilities and could have material adverse effects on our
business, financial condition or results of operations.

In the conduct of our manufacturing operations, we have handled and do handle
materials that are considered hazardous, toxic or volatile under federal, state
and local laws. The risk of accidental release of such materials cannot be
completely eliminated. In addition, we operate or own facilities located on or
near real property that was formerly owned and operated by others. Certain of
these properties were used in ways that involved hazardous materials.
Contaminants may migrate from or within or through property. These releases or
migrations may give rise to claims. Where third parties are responsible for
contamination, the third parties may not have funds, or not make funds available
when needed, to pay remediation costs imposed upon us under environmental laws
and regulations.

We have an accrual related to coal mine shafts. The accrual is based on an
engineering study estimating the cost remediating the dangers (such as a shaft
collapse) of abandoned coal mine shafts in Germany. The reserve is calculated
based upon the cost of remediating the shafts that the study deems most risky.

We Derive a Substantial Portion of Our Revenues from Customers in the
Automotive, Computer and Communications Industries, and We are Susceptible to
Trends and Factors Affecting Those Industries as Well as the Success of Our
Customers' Products

Net sales to the automotive, consumer electronics and communications industries
represent a substantial portion of our revenues. Factors negatively affecting
these industries and the demand for products also negatively affect our
business, financial condition or results of operations. Any adverse occurrence,
including industry slowdown, recession, political instability, costly or
constraining regulations, armed hostilities, terrorism, excessive inflation,
prolonged disruptions in one or more of our customers' production schedules or
labor disturbances, that results in significant decline in the volume of sales
in these industries, or in an overall downturn in the business and operations of
our customers in these industries, could materially adversely affect our
business, financial condition or results of operations. For example, the
automotive industry is highly cyclical in nature and sensitive to changes in
general economic conditions, consumer preferences and interest rates. In
addition, the global automotive industry has overall manufacturing capacity far
exceeding demand. To the extent that demand for certain of our customers'
products decline, the demand for our products may decline. Reduced demand
relating to general economic conditions, consumer preferences, interest rates or
industry over capacity may have a material adverse effect upon our business,
financial condition or results of operations.

Inability to Maintain Access to Capital Markets May Adversely Affect Our
Business and Financial Results

Our ability to invest in our businesses, make strategic acquisitions and
refinance maturing debt obligations may require access to the capital markets
and sufficient bank credit lines to support short-term borrowings. If we are
unable to access the capital markets or bank credit facilities, we could
experience a material adverse affect on our business, financial condition and
results of operations.

Fixed Costs May Reduce Operating Results if Our Sales Fall Below Expectations

Our expense levels are based, in part, on our expectations for future sales.
Many of our expenses, particularly those relating to capital equipment and
manufacturing overhead, are relatively fixed. We might be unable to reduce
spending quickly enough to compensate for reductions in sales. Accordingly,
shortfalls in sales could materially and adversely affect our operating results.

The Volatility of Our Stock Price Could Affect the Value of an Investment in Our
Stock and Our Future Financial Position


                                       10



The market price of our stock has fluctuated widely. Between January 1, 2006 and
December 30, 2006, the closing sale price of our common stock ranged between a
low of $26.59 and a high of $37.26, experiencing greater volatility over that
time than most of the market did. The volatility of our stock price may be
related to any number of factors, such as general economic conditions, industry
conditions, analysts' expectations concerning our results of operations, or the
volatility of our revenues as discussed above under "--Our Revenues May Vary
Significantly from Period to Period." The historic market price of our common
stock may not be indicative of future market prices. We may not be able to
sustain or increase the value of our common stock. Declines in the market price
of our stock could adversely affect our ability to retain personnel with stock
incentives, to acquire businesses or assets in exchange for stock and/or to
conduct future financing activities with or involving our common stock.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

ITEM 2. PROPERTIES

LITTELFUSE FACILITIES

The Company's operations are located in 37 owned or leased facilities worldwide,
representing an aggregate of approximately 1,649,162 square feet. The U.S.
headquarters and largest manufacturing facility are located in Des Plaines,
Illinois, supported by the Company's North American distribution center in
nearby Elk Grove Village, Illinois. The Company has additional North American
manufacturing facilities in Arcola, Illinois, Irving, Texas and two locations in
Mexico. The European headquarters and primary European distribution center is in
the Netherlands, with manufacturing plants in the U.K., Ireland, and Germany.
Asian operations include sales and distribution centers located in Singapore,
Taiwan, Japan, China and Korea, with manufacturing plants in China, Taiwan and
the Philippines. The Company does not believe that it will encounter any
difficulty in renewing its existing leases upon the expiration of their current
terms. Management believes that the Company's facilities are adequate to meet
its requirements for the foreseeable future.

The following table provides certain information concerning the Company's
facilities:



                                                                                    LEASE
                                                             SIZE       LEASE/   EXPIRATION
LOCATION                               USE                 (SQ.FT.)       OWN       DATE       PRIMARY PRODUCT
- --------                   --------------------------   -------------   ------   ----------   -----------------
                                                                               
Des Plaines, Illinois      Administrative,              340,000         Owned    --           Auto, Electronic,
                           Engineering,                                                       Electrical
                           Manufacturing,
                           Testing and Research
Elk Grove Village,         Warehousing                  50,000          Leased   2007         Auto, Electronic,
Illinois                                                                                      and Electrical
Irving, Texas              Engineering,                 101,000         Leased   2014         Electronic
                           Manufacturing,
                           Testing and Research
Brownsville, Texas         Distribution                 15,750          Leased   2009         Electronic
Birmingham, Michigan       Sales                        2,076           Leased   2011         Auto
Matamoros, Mexico          Manufacturing                77,500          Leased   2008         Electronic
Matamoros, Mexico          Administrative and           14,000          Leased   2008         Electronic
                           Manufacturing
Arcola, Illinois           Manufacturing                36,000          Owned      --         Electrical
Arcola, Illinois           Technical Support             7,000          Leased   2007         Electrical
Piedras Negras, Mexico     Administrative and           99,822          Leased   2015         Auto
                           Manufacturing
Piedras Negras, Mexico     Manufacturing                11,189          Leased   2007         Electrical
Piedras Negras, Mexico     Manufacturing                22,380          Leased   2009         Electrical
Piedras Negras, Mexico     Manufacturing                67,225          Leased   2008         Electrical
Swindon, U.K.              Administrative,              6,500           Leased   2012         Electronic
                           Marketing and
                           Sales



                                       11




<Caption>
                                                                                   LEASE
                                                          SIZE          LEASE/   EXPIRATION
LOCATIONS                  USE                          (SQ. FT.)        OWN        DATE      PRIMARY PRODUCT
- ---------                  ---                          ---------       ------   ----------   -------
                                                                               
Utrecht, the Netherlands   Sales,                       34,642          Owned    --           Auto
                           Administrative and                                                 and Electronic
                           Distribution
Essen, Germany             Administrative               8,009           Leased   2011         Electronic and
                                                                                              Auto
Eltville, Germany          Leased to third party        88,943          Owned    --           --
Bochum, Germany            Leased to third party        79,650          Owned    --           --
Essen, Germany             Leased to third party        37,670          Owned    --           --
Essen/Dortmund, Germany    Land leased to third party   --              Owned    --           --
Dunsen, Germany            Manufacturing and Sales      43,971          Owned    --           Auto
Singapore                  Sales and Distribution       8,663           Leased   2007         Electronic
Seoul, Korea               Sales                        4,589           Leased   2007         Electronic and
                                                                                              Auto
Lipa City, Philippines     Manufacturing                58,095          Owned    --           Electronic
Lipa City, Philippines     Manufacturing                22,721          Leased   2007         Electronic
Dongguan, China            Administrative and
                           Manufacturing                53,860          Leased   2009         Electronic
Suzhou, China              Manufacturing                80,732          Owned    --           Electronic
Suzhou, China              Manufacturing                12,390          Leased   2007         Electronic
Yang-Mei, Taiwan           Manufacturing,               40,080          Owned    --           Electronic
                           Sales, Distribution
                           & Administrative
Yung-Ping, Taiwan          Manufacturing,               20,860          Leased   2011         Electronic
                           Sales, Distribution
                           & Administrative
Wuxi, China                Manufacturing                49,630          Owned    --           Electronic
Hong Kong                  Sales                        8,130           Leased   2007         Electronic
Taipei, Taiwan             Sales                        1,184           Leased   2007         Electronic
Yokohama, Japan            Sales                        6,243           Leased   2009         Electronic
Yokohama, Japan            Distribution                 17,858          Leased   2007         Electronic
Sao Paulo, Brazil          Sales                        800             Leased   2009         Electronic
                                                                                              and Auto
Dundalk, Ireland           Manufacturing                120,000         Owned    --           Electronic
                                                                                              and Auto


Properties with lease expirations in 2007 renew at various times throughout the
year. At this point, the Company does not anticipate any material impact as a
result of such expirations.

ITEM 3. LEGAL PROCEEDINGS

The Company is not a party to any legal proceedings that it believes will have a
material adverse effect upon the conduct of its business or its financial
position.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

There were no matters submitted to the Company's stockholders during the fourth
quarter of fiscal 2006.

EXECUTIVE OFFICERS OF THE REGISTRANT

The executive officers of the Company are as follows:



NAME                      AGE                          POSITION
- ----                      ---                          --------
                          
Gordon Hunter              55   Chairman, President and Chief Operating Officer

Philip G. Franklin         55   Vice President, Operations Support and Chief Financial
                                Officer



                                       12




NAME                      AGE                          POSITION
- ----                      ---                          --------
                          
Dal Ferbert                52   Vice President and General Manager of the Electrical
                                Business Unit

David W. Heinzmann         43   Vice President and General Manager of the Automotive
                                Business Unit

David R. Samyn             46   Vice President and General Manager of the Electronics
                                Business Unit

Ryan Stafford              39   General Counsel and Vice President, Human Resources

Mary S. Muchoney           61   Corporate Secretary


Officers of Littelfuse are elected by the Board of Directors and serve at the
discretion of the Board.

Gordon Hunter was elected as the Chairman of the Board of Directors of the
Company and President and Chief Executive Officer effective January 1, 2005. Mr.
Hunter served as Chief Operating Officer of the Company from November 2003 to
January 2005. Mr. Hunter has been a member of the Board of Directors of the
Company since June 2002, where he has served as Chairman of the Technology
Committee. Prior to joining Littelfuse, Mr. Hunter was employed with Intel
Corporation, where he was Vice President, Intel Communications Group, and
General Manager, Optical Products Group, responsible for managing the access and
optical communications business segments, from 2002 to 2003. Mr. Hunter was CEO
for Calmar Optcom during 2001. From 1997 to 2002, he also served as a Vice
President for Raychem Corporation. His experience includes 20 years with Raychem
Corporation in the United States and Europe, with responsibilities in sales,
marketing, engineering and general management.

Philip G. Franklin, Vice President, Operations Support and Chief Financial
Officer, has responsibility for investor relations, finance and accounting,
information systems and global supply chain functions of the Company. Mr.
Franklin joined the Company in 1998 from OmniQuip International, a $450 million
construction equipment manufacturer which he helped take public. Before that,
Mr. Franklin served as Vice President and Chief Financial Officer for both
Monarch Marketing Systems and Hill Refrigeration and in various roles with FMC
Corporation.

Dal Ferbert, Vice President and General Manager, Electrical Business Unit, is
responsible for the management of daily operations, sales, marketing and
strategic planning efforts of the Electrical Business Unit (POWR-GARD Products).
Mr. Ferbert joined the Company in 1976 as a member of the electronic distributor
sales team. From 1980 to 1989 he served in the Materials Management Department
as a buyer and then Purchasing Manager. In 1990, he was promoted to National
Sales Manager of the Electrical Business Unit and then promoted to his current
position in 2004.

David W. Heinzmann, Vice President and General Manager, Automotive Business
Unit, is responsible for marketing, sales, product development and manufacturing
for all automotive customers and products. Mr. Heinzmann began his career at the
Company in 1985, and possesses a broad range of experience within the
organization. He has held positions as a Manufacturing Manager, Quality Manager,
Plant Manager and Product Development Manager. Mr. Heinzmann also served as
Director of Global Operations of the Electronics Business Unit from early 2000
through 2003.

David Samyn, Vice President and General Manager, Electronics Business Unit, is
responsible for marketing, sales, product development and manufacturing for all
electronics customers and products. Mr. Samyn joined the Company's management
team in January 2003 as General Manager of the Electronics Business Unit. Prior
to joining the Company, Mr. Samyn served as Vice President - Global Sales with
Airfiber, Inc., an optical wireless telecom company in San Diego, CA from 2001
to 2003. Before that, Mr. Samyn spent five years with ADC Telecommunications
where he had global sales and marketing responsibilities.

Ryan K. Stafford, General Counsel and Vice President, Human Resources., is
responsible for recruiting, developing and retaining the global workforce and
providing legal expertise. Mr. Stafford joined the Company's management team in
January 2007. Prior to joining the Company, Mr. Stafford served as Vice
President of China Operations for Tyco Engineered Products & Services from 2005
to 2006 and Vice President and General Counsel of it from 2001 to 2005. He
served as Associate General Counsel for Grinnell Corporation from 1998 to 2001.
Prior to that he was with the law firm Sulloway & Hollis P.L.L.C.

Mary S. Muchoney has served as Corporate Secretary since 1991, after joining
Littelfuse in 1977. She is responsible for providing all secretarial and
administrative functions for the President and Littelfuse Board of Directors.
Ms. Muchoney is a member of the American Society of Corporate Secretaries.


                                       13



                                     PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND
ISSUER PURCHASES OF EQUITY SECURITIES

The information set forth under "Quarterly Stock Prices" on page 32 of the
Annual Report to Stockholders is incorporated herein by reference. As of
February 16, 2007, there were 149 holders of record of the Company's Common
Stock.

Shares of the Company's Common Stock are traded under the symbol "LFUS" on The
Nasdaq Stock Market.

The Company has not paid any cash dividends in its history. Future dividend
policy will be determined by the Board of Directors based upon their evaluation
of earnings, cash availability and general business prospects. Currently, there
are restrictions on the payment of dividends contained in the Company's credit
agreements which relate to the maintenance of a minimum net worth and certain
financial ratios.

The table below provides information with respect to purchases by the Company of
shares of its common stock during the fourth quarter of fiscal 2006:

                      ISSUER PURCHASES OF EQUITY SECURITIES


                                                        Total Number of
                                                            Shares
                                                           Purchased
                                                          as Part of
                                                           Publicly         Maximum Number of Shares
                 Total Number of   Average Price Paid   Announced Plans    that May Yet Be Purchased
    Period      Shares Purchased        per Share         or Programs     Under the Plans or Programs
    ------      ----------------   ------------------   ---------------   ---------------------------
                                                              
October 2006              --                 --                  --                 975,000
November 2006        154,000             $31.60             154,000                 821,000
December 2006        150,000             $31.04             150,000                 671,000
Total                304,000             $31.19             304,000                 671,000


The Company's Board of Directors authorized the repurchase of up to 1,000,000
shares under a program for the period May 1, 2006 to April 30, 2007.

ITEM 6. SELECTED FINANCIAL DATA

The information set forth under "Selected Financial Data - Five Year Summary" on
page 31-32 of the Annual Report to Stockholders is incorporated herein by
reference.

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

The information set forth under "Management's Discussion and Analysis of
Financial Condition and Results of Operations" on pages 1 through 8 of the
Annual Report to Stockholders is incorporated herein by reference.


                                       14



ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISKS

The information set forth under "Market Risk" on page 8 of the Annual Report to
Stockholders is incorporated herein by reference.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The Report of Independent Registered Public Accounting Firm and the Consolidated
Financial Statements and notes thereto of the Company set forth on pages 11
through 32 of the Annual Report to Stockholders are incorporated herein by
reference.

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE

None.

ITEM 9A. CONTROLS AND PROCEDURES

DISCLOSURE CONTROLS AND PROCEDURES

The Company maintains disclosure controls and procedures that are designed to
ensure that information required to be disclosed in the Company's Exchange Act
reports is recorded, processed, summarized and reported within the time periods
specified in the Securities and Exchange Commission's rules and forms, and that
such information is accumulated and communicated to the Company's management,
including the Chief Executive Officer and Chief Financial Officer, as
appropriate, to allow timely decisions regarding required disclosure.

As of the end of the period covered by this Annual Report on Form 10-K for
December 30, 2006, the Chief Executive Officer and Chief Financial Officer of
the Company evaluated the effectiveness of the disclosure controls and
procedures of the Company and concluded that these disclosure controls and
procedures are effective to ensure that material information relating to the
Company and its consolidated subsidiaries has been made known to them by the
employees of the Company and its consolidated subsidiaries during the period
preceding the filing of this Report.

Management's Report on Internal Control Over Financial Reporting set forth on
page 9 of the Annual Report to Stockholders are incorporated herein by
reference.

CHANGES IN INTERNAL CONTROL OVER FINANCIAL REPORTING

There was no change in the Company's internal control over financial reporting
that occurred during the Company's most recent fiscal quarter that has
materially affected, or is reasonably likely to materially affect, the Company's
internal control over financial reporting.

ITEM 9B. OTHER INFORMATION

None.

                                    PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

The information set forth under "Election of Directors" and "Section 16(a)
Beneficial Ownership Reporting Compliance" in the Proxy Statement is
incorporated herein by reference. Please also refer to the information set forth
under "Executive Officers of the Registrant" in Part I of this Report. The
Company maintains a code of ethics for its chief executive officer and senior
financial officers and a code of conduct for all of its directors, officers and
associates, which are available for public viewing on the Company's web site
(www.littelfuse.com) under the heading "Investors - Corporate Governance." There
have been no material changes to the procedures by which security holders may
recommend nominees to the Company's Board of Directors in 2006.

ITEM 11. EXECUTIVE COMPENSATION

The information set forth under "Election of Directors - Compensation Committee
Interlocks and Insider Participation" and "Executive Compensation" in the Proxy
Statement is incorporated herein by reference, except the section captioned
"Compensation Committee Report" is hereby "furnished" and not "filed" with this
annual report on Form 10-K.


                                       15


ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

The information set forth under "Ownership of Littelfuse, Inc. Common Stock" in
the Proxy Statement is incorporated herein by reference.

STOCK PLAN DISCLOSURE

The following table represents the Company's equity compensation plans,
including both stockholder approved plans and non-stockholder approved plans.
The section entitled "Compensation of Directors" in the Proxy Statement contains
a summary explanation of the Stock Plan for New Directors of Littelfuse, Inc.,
which has been adopted without the approval of stockholders and is incorporated
herein by reference.



                                                                               NUMBER OF SECURITIES
                                  NUMBER OF SECURITIES                          REMAINING AVAILABLE
                                    TO BE ISSUED UPON      WEIGHTED-AVERAGE     FOR FUTURE ISSUANCE
                                       EXERCISE OF        EXERCISE PRICE OF        UNDER EQUITY
        PLAN CATEGORY              OUTSTANDING OPTIONS   OUTSTANDING OPTIONS    COMPENSATION PLANS
        -------------             --------------------   -------------------   --------------------
                                                                      
Equity compensation plans
   approved by security holders          1,973,170            $  29.56               1,440,970
Equity compensation plans not
   approved by security holders             10,000            $  27.64                      --
                                         ---------            --------               ---------
Total                                    1,983,170            $  29.54               1,440,970


ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS AND DIRECTOR
INDEPENDENCE

The information set forth under "Certain Relationships and Related
Transactions," "Election of Directors - Information Concerning Board of
Directors and its Committees - Policy and Procedures with Respect to Related
Person Transactions" and "Election of Directors" in the Proxy Statement is
incorporated herein by reference.

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

The information set forth under "Audit and Non-Audit Fees" in the Proxy
Statement is incorporated herein by reference.

                                     PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

(a)  Financial Statements and Schedules

     (1)  Financial Statements. The following financial statements included in
          the Annual Report to Stockholders are incorporated herein by
          reference.

     (i)  Report of Independent Registered Public Accounting Firm (page 11).

     (ii) Consolidated Balance Sheet as of December 30, 2006 and December 31,
          2005 (page 12).

     (iii) Consolidated Statements of Income for the years ended December 30,
          2006, December 31, 2005, and January 1, 2005 (page 13).

     (iv) Consolidated Statements of Cash Flows for the years ended December 30,
          2006, December 31, 2005, and January 1, 2005 (page 14).

     (v)  Consolidated Statements of Shareholders' Equity for the years ended
          December 30, 2006, December 31, 2005, and January 1, 2005 (page 15).

     (vi) Notes to Consolidated Financial Statements (pages 16-32).


                                       16



     (2)  Financial Statement Schedules. The following financial statement
          schedule is submitted herewith for the periods indicated therein.

     (i)  Schedule II-Valuation and Qualifying Accounts and Reserves

     All other schedules for which provision is made in the applicable
     accounting regulations of the Securities and Exchange Commission are not
     required under the related instructions or are inapplicable and, therefore,
     have been omitted.

     (3)  Exhibits

     See Exhibit Index on pages 20-21.

(b) Exhibits

     See Exhibit Index on pages 20-21.

(c) Financial Statement Schedules


                                       17


                                LITTELFUSE, INC.
          SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
                                 (IN THOUSANDS)



                                                ADDITIONS
                                               CHARGED TO
                                  BALANCE AT    COSTS AND                BALANCE AT
                                   BEGINNING    EXPENSES    DEDUCTIONS     END OF
          DESCRIPTION               OF YEAR        (A)          (B)         YEAR
          -----------             ----------   ----------   ----------   ----------
                                                             
Year ended December 30, 2006
   Allowance for losses on
      accounts receivable .....     $2,165       $  127       $1,309       $   983
                                    ======       ======       ======       =======
   Reserves for sales discounts
      and allowances ..........     $9,738       $6,782       $   --       $16,520
                                    ======       ======       ======       =======
Year ended December 31, 2005
   Allowance for losses on
      accounts receivable .....     $1,481       $1,206       $  522       $ 2,165
                                    ======       ======       ======       =======
   Reserves for sales discounts
      and allowances ..........     $8,538       $1,200       $   --       $ 9,738
                                    ======       ======       ======       =======
Year ended January 1, 2005
   Allowance for losses on
      accounts receivable .....     $1,042       $  591       $  152       $ 1,481
                                    ======       ======       ======       =======
   Reserves for sales discounts
      and allowances ..........     $6,428       $2,112       $    2       $ 8,538
                                    ======       ======       ======       =======


(A)  Allowance for losses on accounts receivable includes acquired balances of
     $123 for Heinrich in fiscal year 2004.

(B)  Write-off of uncollectible accounts, net of recoveries and foreign currency
     translation.


                                       18



                                   SIGNATURES

     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.

                                        Littelfuse, Inc.


                                        By /s/ Gordon Hunter
                                           -------------------------------------
                                           Gordon Hunter,
                                           Chairman of the Board of Directors,
                                           President and Chief Executive Officer

Date: February 27, 2007

     Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
registrant and in the capacities indicated on February 27, 2007.


/s/ Gordon Hunter                       Chairman of the Board of Directors,
- -------------------------------------   President and Chief Executive Officer
Gordon Hunter                           (Principal Executive Officer)


/s/ John P. Driscoll                    Director
- -------------------------------------
John P. Driscoll


/s/ Anthony Grillo                      Director
- -------------------------------------
Anthony Grillo


/s/ Bruce A. Karsh                      Director
- -------------------------------------
Bruce A. Karsh


/s/ John E. Major                       Director
- -------------------------------------
John E. Major


/s/ William P. Noglows                  Director
- -------------------------------------
William P. Noglows


/s/ Ronald L. Schubel                   Director
- -------------------------------------
Ronald L. Schubel


/s/ Philip G. Franklin                  Vice President, Operations Support and
- -------------------------------------   Chief Financial Officer (Principal
Philip G. Franklin                      Financial and Principal Accounting
                                        Officer)


                                       19



                                LITTELFUSE, INC.
                                INDEX TO EXHIBITS



NUMBER                            DESCRIPTION OF EXHIBIT ------
- ----------------------       
3(I)     Certificate of Incorporation, as amended to date (filed as exhibit 3(I)
         to the Company's Form 10-K for the fiscal year ended January 3, 1998
         (1934 Act File No. 0-20388) and incorporated herein by reference).

3(I)A    Certificate of Designations of Series A Preferred Stock (filed as
         exhibit 4.2 to the Company's Current Report on Form 8-K dated December
         1, 1995 (1934 Act File No. 0-20388) and incorporated herein by
         reference).

3(II)    Bylaws, as amended to date (filed as exhibit 3(II) to the Company's
         Form 8-K dated February 2, 2007 (1934 Act File No. 0-20388) and
         incorporated herein by reference).


10.1     Employment Agreement dated as of May 1, 2006, between Littelfuse, Inc.
         and Gordon Hunter (filed as exhibit 99.1 to the Company's Form 8-K
         dated May 5, 2006 (1934 Act File No. 0-20388) and incorporated herein
         by reference).

10.2     1993 Stock Plan for Employees and Directors of Littelfuse, Inc., as
         amended (filed as exhibit 10.1 to the Company's Form 10-Q for the
         quarterly period ended July 2, 2005 (1934 Act File No. 0-20388) and
         incorporated herein by reference).

10.3     Littelfuse, Inc. Supplemental Executive Retirement Plan (filed as
         exhibit 10.10 to the Company's Form 10-K for the year ended December
         31, 1993 (1934 Act File No. 0-20388) and incorporated herein by
         reference).

10.4     Littelfuse Deferred Compensation Plan for Non-employee Directors, as
         amended (filed as exhibit 10.4 to the Company's Form 10-Q for the
         quarterly period ended July 2, 2005 (1934 Act File No. 0-20388) and
         incorporated herein by reference).

10.5     Change of Control Employment Agreement dated as of September 1, 2006,
         between Littelfuse, Inc. and Gordon Hunter.

10.6     Change of Control Employment Agreement dated as of September 1, 2006,
         between Littelfuse, Inc. and Philip G. Franklin.


10.7     Change of Control Employment Agreement dated as of September 1, 2006,
         between Littelfuse, Inc. and David R. Samyn.


10.8     Change of Control Employment Agreement dated as of September 1, 2006,
         between Littelfuse, Inc. and David W. Heinzmann.

10.9     Change of Control Employment Agreement dated as of September 1, 2006,
         betweeen Littelfuse, Inc. and Hugh Dalsen Ferbert.


10.10    Stock Plan for New Directors of Littelfuse, Inc. (filed as exhibit 10.2
         to the Company's Form 10-Q for the quarterly period ended July 2, 2005
         (1934 Act File No. 0-20388) and incorporated herein by reference).

10.11    Bank credit agreement among Littelfuse, Inc., as borrower, the lenders
         named therein and the Bank of America N.A., as agent, dated as of
         July 21, 2006 (filed as exhibit 10.1 to the Company's Form 10-Q for
         the quarterly period ended September 30, 2006 (1934 Act File No.
         0-20388) and incorporated herein by reference).

10.12    Stock Plan for Employees and Directors of Littelfuse, Inc., as amended
         (filed as exhibit 10.3 to the Company's Form 10-Q for the quarterly
         period ended July 2, 2005 (1934 Act File No. 0-20388) and incorporated
         herein by reference).

10.13    Littelfuse, Inc. Retirement Plan dated January 1, 1992, as amended and
         restated (filed as exhibit 4.4 to the Company's Form 10-K for the
         fiscal year ended December 29, 2001 (1934 Act File No. 0-20388) and
         incorporated herein by reference).

10.14    First Amendment to the Littelfuse, Inc. Retirement Plan (filed as
         exhibit 4.5 to the Company's Form 10-K for the fiscal year ended
         December 28, 2002 (1934 Act File No. 0-20388) and incorporated herein
         by reference).

10.15    Littelfuse, Inc. 401(k) Savings Plan (filed as exhibit 4.8 to the
         Company's Form 10-K for the fiscal year ended December 31, 1992 (1934
         Act File No. 0-20388) and incorporated herein by reference).

10.16    Form of Non-Qualified Stock Option Agreement under the 1993 Stock Plan
         for Employees and Directors of



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NUMBER                            DESCRIPTION OF EXHIBIT
- ------                            ----------------------
      
         Littelfuse, Inc. for employees of the Company (filed as exhibit 99.1 to
         the Company's Current Report on Form 8-K dated November 8, 2004 (1934
         Act File No. 0-20388) and incorporated herein by reference).

10.17    Form of Performance Shares Agreement under the 1993 Stock Plan
         for Employees and Directors of Littelfuse, Inc. (filed as exhibit
         10.23 to the Company's Form 10-K for the annual period ended
         January 1, 2005 (1934 Act File No. 0-20388) and incorporated herein by
         reference).

10.18    Form of Non-Qualified Stock Option Agreement under the 1993
         Stock Plan for Employees and Directors of Littelfuse, Inc. for
         non-employee directors of the Company (filed as exhibit
         10.24 to the Company's Form 10-K for the annual period ended
         January 1, 2005 (1934 Act File No. 0-20388) and incorporated herein by
         reference).

10.19    Summary of Executive Officer Compensation.

10.20    Summary of Director Compensation.

10.21    Amendment to Non-Qualified Stock Option Agreement and Agreement for
         Deferred Compensation between Littelfuse, Inc. and Gordon Hunter (filed
         as exhibit 10.27 to the Company's Form 10-K for the fiscal year ended
         December 31, 2005 (1934 Act File No. 0-20388) and incorporated herein
         by reference).

10.22    Littelfuse, Inc. Equity Incentive Compensation Plan (filed as exhibit A
         to Company Proxy Statement for Annual Meeting of Stockholders held on
         May 5, 2006 (1934 Act File No. 0-20388) and incorporated herein by
         reference).

10.23    Littelfuse, Inc. Outside Directors' Stock Option Plan (filed as exhibit
         B to Company Proxy Statement for Annual Meeting of Stockholders held on
         May 5, 2006 (1934 Act File No. 0-20388) and incorporated herein by
         reference).

10.24    Form of Non-Qualified Stock Option Agreement under the Littelfuse, Inc.
         Outside Directors' Stock Option Plan (filed as exhibit 99.6 to the
         Company's Form 8-K dated May 5, 2006 (1934 Act File No. 0-20388) and
         incorporated herein by reference).

10.25    Form of Performance Share Agreement under the Littelfuse, Inc. Equity
         Incentive Compensation Plan (filed as exhibit 99.5 to the Company's
         Form 8-K dated May 5, 2006 (1934 Act File No. 0-20388) and incorporated
         herein by reference).

10.26    Form of Non-Qualified Stock Option Agreement under the Littelfuse, Inc.
         Equity Incentive Compensation Plan (filed as exhibit 99.4 to the
         Company's Form 8-K dated May 5, 2006 (1934 Act File No. 0-20388) and
         incorporated herein by reference).

13.1     Portions of Littelfuse Annual Report to Stockholders for the fiscal
         year ended December 30, 2006.

14.1     Code of Ethics for Principal Executive and Financial Officers (filed as
         exhibit 14.1 to the Company's Form 10-K for the annual period ended
         January 1, 2005 (1934 Act File No. 0-20388) and incorporated herein by
         reference).

21.1     Subsidiaries.

23.1     Consent of Independent Registered Public Accounting Firm.

31.1     Certification of Gordon Hunter, Pursuant to Section 302 of the
         Sarbanes-Oxley Act of 2002.

31.2     Certification of Philip Franklin, Pursuant to Section 302 of the
         Sarbanes-Oxley Act of 2002.

32.1*    Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of
         2002, 18 U.S.C. Section 1350.


     Except for Exhibit 10.11, Exhibits 10.1 through 10.26 are management
     contracts or compensatory plans or arrangements.

*    Furnished, not filed.


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