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 Long-Term Stock  Incentive Plan 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