Exhibit 4.3A First Amendment to Warrant Agreement This First Amendment to Warrant Agreement is made and entered into as of the 10th day of June, 1997, by and between Littelfuse, Inc. (the OCompanyO) and LaSalle National Bank (formerly known as LaSalle National Trust, N.A.), as Warrant Agent (the OWarrant AgentO); W i t n e s s e t h: Whereas, the Company and the Warrant Agent have heretofore executed that certain Warrant Agreement dated as of December 20, 1991 (the OWarrant AgreementO); and Whereas, the Company has received the written consents of the holders of the certificates representing at least a majority of the outstanding Warrants under the Warrant Agreement to an amendment to the Warrant Agreement to add a new Section 12.19; Now, Therefore, in consideration of the premises and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows: 1. The Warrant Agreement is hereby amended to add the following new SectionE12.19 to the end of the Warrant Agreement: 12.19. Adjustments Relating to June 10, 1997, Common Stock Dividend. In the event that the Company pays on or about June 10, 1997 (the date of payment being hereinafter referred to as the OStock Dividend Payment DateO), a dividend of one share of the Common Stock on each issued and outstanding share of the Common Stock, effective as of the Stock Dividend Payment Date: (i) the Exercise Price shall be halved to $4.18; (ii) a Stock Unit shall remain at one share of New Common Stock, subject to subsequent adjustments as provided in this Agreement; and (iii) the number of Warrants represented by each certificate representing Warrants outstanding on June 10, 1997, shall be doubled. 2. Except as specifically amended by this document, the Warrant Agreement shall remain unchanged and shall continue in full force and effect. In Witness Whereof, the parties hereto have executed this First Amendment to Warrant Agreement as of the day and year first above written. LaSalle National Bank, as Warrant Agent By Authorized Signature _______________________ ____ Title Littelfuse, Inc. By Title ___________________