Exhibit 10.5
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     Reference is made to that certain lease dated September 12, 1988 made by
and between LYNN SHADOWS, a California General Partnership, as Landlord, and
SEMTECH CORPORATION, a Delaware Corporation, as Tenant, covering property
situated in Newbury Park, County of Ventura, State of California described in
Exhibit A of above referenced lease.  Effective January 1, 1996, all right,
title and interest in and to said Lease was assigned by LYNN SHADOWS, a
California General Partnership, unto LYNN SHADOWS, L.L.C., a California Limited
Liability Company in accordance with an Assignment of Lease, dated as of January
1, 1996.  All references to Landlord in this Extension of Lease shall mean LYNN
SHADOWS, L.L.C.

     NOW, THEREFORE, it is agreed between the parties hereto that the above
referenced lease and additions thereto be extended in accordance with the
following terms and conditions:

     1.   The lease term is to be extended for a period of five (5) years from
September 1, 1998 and to terminate on August 31, 2003.

     2.   The minimum monthly rental commencing September 1, 1998 and for the
balance of the extended lease term, shall be Eighteen Thousand Seven Hundred and
Fifty Six Dollars and no/100ths ($18,756.00).

     3.   Tenant shall have the right to cancel this lease at any time during
the extension period after August 31, 2001 as long as written notice is provided
to Landlord at least twelve (12) months prior to the termination date selected
by Tenant.

     4.   Paragraph 44 of the Lease dated September 13, 1988 is herewith
deleted.

     5.   Other than as herein specifically amended, all other terms and
conditions of that certain lease dated September 12, 1988 shall remain in full
force and effect during the term of this extension herein provided.

     IN WITNESS WHEREOF, the parties hereto set their hands this September 9th
day of September 1997.

LANDLORD            LYNN SHADOWS, a California Limited Liability Company

                         By: __________________________________________

                         By: __________________________________________

                         By: __________________________________________

                         By: __________________________________________

TENANT              SEMTECH CORPORATION

                         By: __________________________________________

                         By: __________________________________________

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