Exhibit 23.1

            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Annual Report (Form 10-K)
of Littelfuse, Inc. of our reports dated March 13, 2006, with respect to the
consolidated financial statements of Littelfuse, Inc., Littelfuse, Inc.
management's assessment of the effectiveness of internal control over financial
reporting, and the effectiveness of internal control over financial reporting of
Littelfuse, Inc., included in the 2005 Annual Report to Stockholders of
Littelfuse, Inc.

Our audits also included the financial statement schedule of Littelfuse, Inc.
listed in Item 15(a). This schedule is the responsibility of Littelfuse, Inc.'s
management. Our responsibility is to express an opinion based on our audits. In
our opinion, the financial statement schedule referred to above, when considered
in relation to the basic financial statements taken as a whole, presents fairly
in all material respects the information set forth therein.

We also consent to the incorporation by reference in the Registration Statement
on Form S-8 (File No. 333-64285) of Littelfuse, Inc. of our reports dated March
13, 2006, with respect to the consolidated financial statements of Littelfuse,
Inc., Littelfuse, Inc. management's assessment of the effectiveness of internal
control over financial reporting, and the effectiveness of internal control over
financial reporting of Littelfuse, Inc., incorporated herein by reference and
our report included in the preceding paragraph with respect to the financial
statement schedule in this Annual Report (Form 10-K) of Littelfuse, Inc.


/s/ Ernst & Young LLP

Chicago, Illinois
March 13, 2006