POWER OF ATTORNEY


The undersigned, Edward Yeow, hereby constitutes and appoints
David G. Franz, Jr. and Suzanna Fabos, and each of them,
jointly and severally, his lawful attorney in fact and agent,
with full power of substitution and resubstitution, for him
and in his name, place and stead, in any and all capacities,
to execute and file with the Securities and Exchange Commission
and any stock exchange or similar authority (or any other
governmental or regulatory authority) Forms 3, 4 and 5 under
Section 16(a) of the Securities Exchange Act of 1934, as amended
(the Act) and the rules thereunder, or any other appropriate
form, and all amendments thereto with all exhibits and any and
all documents required to be filed with respect thereto, relating
to his holdings or beneficial ownership of securities issued by
Semtech Corporation, a corporation organized under the laws of
the State of Delaware (the Corporation), granting unto said
attorneys in fact and agents, and each of them, full power and
authority to do and perform each and every act and thing requisite
or necessary to be done as fully to all intents and purposes as
he might or could do in person, hereby ratifying and confirming
all that said attorneys in fact and agents, and each of them, or
his or her substitute or substitutes, may do or lawfully cause to
be done by virtue hereof.

The undersigned acknowledges that the foregoing attorneys in fact
and agents, solely by virtue of serving in such capacity at the
request of the undersigned, are not assuming, nor is the Corporation
assuming, any of the undersigneds responsibilities to comply with
Section 16 of the Act.

This Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4 and 5 with
respect to the undersigneds holdings or beneficial ownership of
and transactions in securities issued by the Corporation, unless
earlier revoked by the undersigned in a writing delivered to the
foregoing attorneys in fact.


/s/ Edward Yeow
Edward Yeow
February 20, 2004