<Page>
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
FORM 8-K
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934
Date of report (Date of earliest event reported): September 12, 2002
SILICON LABORATORIES INC.
(Exact Name of Registrant as Specified in Charter)
Delaware 000-29823 74-2793174
- ---------------------------- ------------------------ -------------------
(State or Other Jurisdiction (Commission File Number) (IRS Employer
of Incorporation) Identification No.)
4635 Boston Lane, Austin, TX 78735
---------------------------------------------------
(Address of Principal Executive Offices) (Zip Code)
Registrant's telephone number, including area code: (512) 416-8500
Not Applicable
-------------------------------------------------------------
(Former Name or Former Address, if Changed since Last Report)
<Page>
ITEM 5. OTHER EVENTS
On September 12, 2002, Silicon Laboratories Inc. (the "Registrant")
announced that it has appointed Russell J. Brennan as chief financial
officer. A copy of the press release issued by the Registrant on September
12, 2002 concerning this appointment is filed herewith as Exhibit 99.1 and is
incorporated herein by reference.
<Page>
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.
Silicon Laboratories Inc.,
a Delaware corporation
Dated: September 12, 2002 By: /s/ NAVDEEP S. SOOCH
---------------------
Navdeep S. Sooch
CHAIRMAN AND
CHIEF EXECUTIVE OFFICER
(PRINCIPAL EXECUTIVE OFFICER)
<Page>
EXHIBIT INDEX
<Table>
<Caption>
Exhibit
Number Description
- ------ -----------
99.1 Press Release dated September 12, 2002, of the Registrant.
</Table>