<DOCUMENT>
<TYPE>EX-23
<SEQUENCE>3
<FILENAME>ex23-1.txt
<DESCRIPTION>EX. 23.1: ERNST & YOUNG
<TEXT>


                                                                    Exhibit 23.1



            Consent of Independent Registered Public Accounting Firm


We consent to the reference to our firm in the  Registration  Statement Form S-8
pertaining to the Non-Qualified  Stock Option Grants of Semtech  Corporation and
to the  incorporation  by reference  therein of our report dated March 26, 2004,
with respect to the  consolidated  financial  statements and schedule of Semtech
Corporation included in its Annual Report (Form 10-K) for the year ended January
25, 2004, filed with the Securities and Exchange Commission.




                                                           /s/ ERNST & YOUNG LLP

Los Angeles, California
August 31, 2004


</TEXT>
</DOCUMENT>
