Exhibit 99.1

                                Littelfuse, Inc.

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


Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and
(b) of Section 1350, Chapter 63 of title 18, United States Code), each of the
undersigned officers of Littelfuse, Inc. (the Company), does hereby certify
that:

The Quarterly Report of Form 10-Q for the quarter ended March 29, 2003 of the
Company fully complies, in all material respects, with the requirements of
section 13 (a) or 15 (d) of the Securities Exchange Act of 1934, and information
contained in the Form 10-Q fairly presents, in all material respects, the
financial condition and results of operations of the Company.


                                                                    
/s/  Howard B. Witt                                                    /s/  Philip Franklin
-----------------------------------------------                        -----------------------------------
Chairman, President and Chief Executive Officer                        Vice President, Treasurer and Chief
                                                                       Financial Officer




May 12, 2003
















A signed original of this written statement required by Section 906 has been
provided to Littelfuse, Inc. and will be retained by Littelfuse and furnished to
the Securities and Exchange Commission or its staff upon request