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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0000898430-01-502274.txt : 20010905
<SEC-HEADER>0000898430-01-502274.hdr.sgml : 20010905
ACCESSION NUMBER:		0000898430-01-502274
CONFORMED SUBMISSION TYPE:	424B3
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20010904

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SEMTECH CORP
		CENTRAL INDEX KEY:			0000088941
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				952119684
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0131

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-36632
		FILM NUMBER:		1730716

	BUSINESS ADDRESS:	
		STREET 1:		652 MITCHELL RD
		CITY:			NEWBURY PARK
		STATE:			CA
		ZIP:			91320
		BUSINESS PHONE:		8054982111

	MAIL ADDRESS:	
		STREET 1:		652 MITCHELL ROAD
		STREET 2:		652 MITCHELL ROAD
		CITY:			NEWBURY PARK
		STATE:			CA
		ZIP:			91320
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B3
<SEQUENCE>1
<FILENAME>d424b3.txt
<DESCRIPTION>PROSPECTUS SUPPLEMENT
<TEXT>
<PAGE>

PROSPECTUS SUPPLEMENT NO. 20                  Filed Pursuant to Rule 424 (b) (3)
(To Prospectus dated June 12, 2000)         Registration Statement No. 333-36632

                               [LOGO OF SEMTECH]

          $400,000,000 4 1/2% Convertible Subordinated Notes Due 2007
                                      and
     4,735,970 Shares of Common Stock Issuable Upon Conversion of the Notes

                         -----------------------------

     The following information supplements information contained in our
prospectus dated June 12, 2000, relating to the potential offer and sale from
time to time by holders of the notes and the underlying shares of our common
stock. See "Plan of Distribution" in our prospectus.

     This prospectus supplement may only be delivered or used in connection with
our prospectus. This prospectus supplement is incorporated by reference into our
prospectus. Our common stock is listed on The Nasdaq National Market under the
symbol "SMTC."

     NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE
ADEQUACY OR ACCURACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                         -----------------------------


                 Prospectus Supplement dated September 4, 2001.
<PAGE>

     We originally issued and sold the notes to Morgan Stanley & Co.
Incorporated and Banc of America Securities LLC, as initial purchasers, in a
transaction exempt from the registration requirements of the Securities Act.
The initial purchasers sold the convertible notes to persons reasonably believed
by the initial purchasers to be qualified institutional buyers or other
institutional accredited investors. Selling holders, including their
transferees, pledgees or donees or their successors, may from time to time offer
and sell any or all the notes and common stock into which the notes are
convertible.

                         -----------------------------

     The following table supplements the information in our prospectus with
respect to the selling holders and the principal amounts of notes and common
stock they beneficially own that may be offered under our prospectus. The
information is based on information provided by or on behalf of the selling
holders.  All information provided in this prospectus supplement is as of August
13, 2001.

     The selling holders may offer all, some or none of the notes or common
stock into which the notes are convertible. Thus, we cannot estimate the amount
of the notes or the common stock that will be held by the selling holders upon
termination of any sales. The column showing ownership after completion of the
offering assumes that the selling holders will sell all of the securities
offered by this prospectus. In addition, the selling holders identified below
may have sold, transferred or otherwise disposed of all or a portion of their
notes since the date on which they provided the information about their notes in
transactions exempt from the registration requirements of the Securities Act.
None of the selling holders has had any material relationship with us or our
affiliates within the past three years. This table assumes that other holders of
notes or any future transferee from any such holder do not beneficially own any
common stock other than common stock into which the notes are convertible.
<TABLE>
<CAPTION>
                                                                                                           Common Stock
                                                Principal Amount       Common Stock                     Beneficially Owned
                                                    of Notes           Beneficially     Common            After Offering (2)
                                               Beneficially Owned      Owned Before      Stock            --------------
Name and Address                                   and Offered           Offering       Offered(1)     Amount            %
- ----------------                                   -----------           --------       -------        ------           ---
- ------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>                  <C>            <C>              <C>           <C>
GLG Market Neutral Fund......................       $7,000,000              0            82,879           0              *
 One Curzon Street
 London, WIJSHB, England
- ------------------------------------------------------------------------------------------------------------------------------
TOTAL........................................       $7,000,000              0            82,879           0              *
==============================================================================================================================
</TABLE>

*    Less than 1%.
(1)  Assumes conversion of all the holder's notes at a conversion price of
$84.46 per share of common stock and resale of all shares of common stock
offered hereby.
(2)  Calculated based on Rule 13d-3(d)(1) promulgated under the Securities
Exchange Act of 1934, as amended.

     The foregoing is a list of selling holders who are either purchasers or
transferees of the notes and for whose benefit we entered into that certain
Registration Rights Agreement dated as of February 14, 2000.  We make no
representation that any note issued will be or has been sold pursuant to this
prospectus.

     Information concerning the selling holders may change from time to time and
any changed information will be set forth in supplements or amendments to this
prospectus, if necessary. In addition, the per share conversion price, and
therefore the number of shares of common stock issuable upon conversion of the
notes, is subject to adjustment. As a result, the aggregate principal amount of
notes and the number of shares of common stock into which the notes are
convertible may increase or decrease.

                                      S-2

</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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