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                                                              OMB APPROVAL
                           UNITED STATES               -------------------------
                SECURITIES AND EXCHANGE COMMISSION     OMB Number:     3235-0058
                       Washington, DC 20549            Expires:   April 30, 2009
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                            FORM 12b-25                hours per response...2.50
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                    NOTIFICATION OF LATE FILING              SEC FILE NUMBER
                                                                0-19724
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                                                         ----------------------
                                                              CUSIP NUMBER
(Check One):  [_]Form 10-K [_]Form 20-F [_]Form 11-K           743697 10 4
              [X]Form 10-Q [_]Form 10-D[_]Form N-SAR
              [_]Form N-CSR
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     For Period Ended: July 30, 2006
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     [_]  Transition Report on Form 10-K
     [_]  Transition Report on Form 20-F
     [_]  Transition Report on Form 11-K
     [_]  Transition Report on Form 10-Q
     [_]  Transition Report on Form N-SAR
     For the Transition Period Ended:
                                      ------------------------------------------

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  Read Instruction (on back page) Before Preparing Form. Please Print or Type.

      Nothing in this form shall be construed to imply that the Commission
                 has verified any information contained herein.
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If the notification relates to a portion of the filing checked above, identify
the Item(s) to which the notification relates:


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PART I -- REGISTRANT INFORMATION

Semtech Corporation
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Full Name of Registrant


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Former Name if Applicable


200 Flynn Road
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Address of Principal Executive Office (Street and Number)


Camarillo, California  93012-2111
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City, State and Zip Code



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PART II -- RULES 12b-25(b) AND (c)

If the subject report could not be filed without unreasonable effort or expense
and the registrant seeks relief pursuant to Rule 12b-25(b), the following should
be completed. (Check box if appropriate.)


          |    (a)  The reasons described in reasonable detail in Part III of
          |         this form could not be eliminated without unreasonable
          |         effort or expense;
          |    (b)  The subject annual report, semi-annual report, transition
          |         report on Form 10-K, Form 20-F, Form 11-K, Form N-SAR or
          |         Form N-CSR, or portion thereof, will be filed on or before
    [_]   |         the fifteenth calendar day following the prescribed due
          |         date; or the subject quarterly report or transition report
          |         on Form 10-Q or subject distribution report on Form 10-D, or
          |         portion thereof, will be filed on or before the fifth
          |         calendar day following the prescribed due date; and
          |    (c)  The accountant's statement or other exhibit required by Rule
          |         12b-25(c) has been attached if applicable.

PART III -- NARRATIVE

State below in reasonable detail why Forms 10-K, 20-F, 11-K, 10-Q, 10-D, N-SAR,
N-CSR or the transition report or portion thereof, could not be filed within the
prescribed time period.

As previously reported, the Company has been engaged in an internal review of
its stock option practices in light of an informal SEC inquiry. On June 9, 2006,
the Audit Committee, with the assistance of independent counsel and forensic
accountants, commenced an internal investigation of the Company's stock option
practices and associated accounting.

On June 15, 2006 the Company received a Staff Determination letter from the
Nasdaq Stock Market indicating that the Company's securities are subject to
delisting from The Nasdaq National Market because the Company has not yet filed
its Form 10-Q for the fiscal quarter ended April 30, 2006 ("First Quarter Form
10-Q") and is therefore not in compliance with the continued listing standard in
Nasdaq Marketplace Rule 4310(c)(14).

On July 12, 2006, the Board of Directors appointed a Special Committee to
continue the Audit Committee investigation. The Special Committee is comprised
of members who had not served the Company or the Board in any capacity prior to
December 2002. The Special Committee has not completed its work or reached final
conclusions and is continuing its investigation.

On July 20, 2006, the Company announced that it expects to restate its financial
statements for fiscal years 2002 through 2006 ("Restated Historical
Financials"). The restatement will also affect financial statements for earlier
fiscal years and adjustments for those earlier years will be reflected as part
of the opening balances in the financial statements for the restatement period.

On August 29, 2006 a Nasdaq Listing Qualifications Panel ("Panel") granted the
Company's request for additional time to regain compliance and set November 10,
2006 as the date by which the Company must file all required restatements and
the First Quarter Form 10-Q.

Also on August 29, 2006 the Company announced that because of the pending
restatement, it will be unable to timely file its Form 10-Q for the fiscal
quarter ended July 30, 2006 ("Second Quarter Form 10-Q"). This will cause
another instance of noncompliance with the continued listing standard in Nasdaq
Marketplace Rule 4310(c)(14). The delayed filing of the Second Quarter Form 10-Q
had been previously contemplated by the Company and was therefore incorporated
into the plan of compliance presented by the Company to the Panel at the hearing
in August 2006. The Company expects to file the



Second Quarter Form 10-Q by the November 10, 2006 deadline established by Nasdaq
with respect to the Restated Historical Financials and the First Quarter Form
10-Q.


PART IV - OTHER INFORMATION

(1)  Name and telephone number of person to contact in regard to this
     notification

              David G. Franz, Jr.                  (805)           498-2111
     ----------------------------------------  -------------  ------------------
                      (Name)                    (Area Code)   (Telephone Number)

(2)  Have all other periodic reports required under Section 13 or 15(d) of the
     Securities Exchange Act of 1934 or Section 30 of the Investment Company Act
     of 1940 during the preceding 12 months or for such shorter period that the
     registrant was required to file such report(s) been filed? If the answer is
     no, identify report(s). |_| Yes |X| No

     The Company filed a Form 12b-25 on June 9, 2006, with respect to the First
     Quarter Form 10-Q. The Company expects to file the Restated Historical
     Financials and the First Quarter Form 10-Q by November 10, 2006.

(3)  Is it anticipated that any significant change in results of operations from
     the corresponding period for the last fiscal year will be reflected by the
     earnings statements to be included in the subject report or portion
     thereof? |X| Yes |_| No

     If so: attach an explanation of the anticipated change, both narratively
     and quantitatively, and, if appropriate, state the reasons why a reasonable
     estimate of the results cannot be made.

       As previously announced by the Company in the Form 8-K filed on August
       29, 2006 and the press released attached as an exhibit thereto (together,
       the "August 29 Form 8-K"), net sales for the second quarter of fiscal
       year 2007 were $64.9 million, up 12 percent from $58.0 million in the
       second quarter of fiscal year 2006 and down 1 percent sequentially when
       compared to the first quarter of fiscal year 2007. New orders for the
       second quarter of fiscal year 2007 exceeded shipments, resulting in a
       positive book-to-bill ratio for the quarter. The Company had $307.4
       million of cash, cash equivalents and marketable securities as of July
       30, 2006, which was up $23.3 million from the balance on April 30, 2006.

       Because of the pending restatement of the Company's historical financial
       statements, additional results for the second fiscal quarter will not be
       available until the Restated Historical Financials have been filed and
       all financial numbers presented here and in the August 29 Form 8-K should
       be considered estimates. For additional information regarding the pending
       restatement, see the Company's Report on Form 8-K filed on July 20, 2006.

       This Form 12b-25 contains forward-looking statements, including
       statements regarding financial results for the second quarter and the
       Company's expectations with respect to filing the Restated Historical
       Financials, the First Quarter Form 10-Q and the Second Quarter Form 10-Q.
       Forward-looking statements involve risks and uncertainties that could
       cause actual results to differ materially from those projected.
       Forward-looking statements should be considered in conjunction with the
       cautionary statements contained in the "Risk Factors" section and
       elsewhere in the Company's Annual Report on Form 10-K for the fiscal year
       ended January 29, 2006, in the Company's other filings with the SEC, and
       in material incorporated therein by reference. Forward-looking statements
       should not be regarded as representations by the Company that its
       objectives or plans will be achieved or that any of its operating
       expectations or financial forecasts will be realized. The Company assumes
       no obligation to update or revise any forward-looking



       statements, whether as a result of new information, future events or
       otherwise. In addition, there are a number of risks associated with
       matters relating to the Company's historical stock option practices. The
       Company cannot predict when either the internal investigation or
       restatement will be completed and there may be negative tax or other
       implications for the Company resulting from the accounting adjustments.
       The Company cannot predict the outcome of the SEC inquiry, the internal
       investigation, or any other lawsuit or other proceeding related to the
       Company's stock option practices. There can be no assurance that the
       Company will maintain its Nasdaq listing. The Company could also be
       subjected to other lawsuits and could become the subject of other
       regulatory investigations in addition to those now underway. Dealing with
       matters related to historical stock option practices could divert
       management's attention from operations and expenses arising from
       management's review, the Special Committee's investigation, the
       restatement, related litigation and other associated activities are
       expected to continue to be significant. Current and former employees,
       officers and directors have sought, and will likely continue to seek,
       indemnification or advancement or reimbursement of expenses from the
       Company, including attorneys' fees, with respect to current or future
       proceedings related to stock option practices. These events could
       adversely affect the Company's business and the price of its common
       stock.




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                               Semtech Corporation

         --------------------------------------------------------------
                  (Name of Registrant as Specified in Charter)

has caused this notification to be signed on its behalf by the undersigned
hereunto duly authorized.


Date:     September 8, 2006             By:   /s/ David G. Franz, Jr.
     -----------------------------       ---------------------------------------
                                         Name:  David G. Franz, Jr.
                                         Title: Chief Financial Officer



INSTRUCTION: The form may be signed by an executive officer of the registrant or
by any other duly authorized representative. The name and title of the person
signing the form shall be typed or printed beneath the signature. If the
statement is signed on behalf of the registrant by an authorized representative
(other than an executive officer), evidence of the representative's authority to
sign on behalf of the registrant shall be filed with the form.

                                   ATTENTION
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            Intentional misstatements or omissions of fact constitute
                Federal Criminal Violations (see 18 U.S.C. 1001).
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                              GENERAL INSTRUCTIONS

1.   This form is required by Rule 12b-25 (17 CFR 240.12b-25) of the General
     Rules and Regulations under the Securities Exchange Act of 1934.

2.   One signed original and four conformed copies of this form and amendments
     thereto must be completed and filed with the Securities and Exchange
     Commission, Washington, DC 20549, in accordance with Rule 0-3 of the
     General Rules and Regulations under the Act. The information contained in
     or filed with the form will be made a matter of public record in the
     Commission files.

3.   A manually signed copy of the form and amendments thereto shall be filed
     with each national securities exchange on which any class of securities of
     the registrant is registered.

4.   Amendments to the notifications must also be filed on form 12b-25 but need
     not restate information that has been correctly furnished. The form shall
     be clearly identified as an amended notification.

5.   Electronic Filers. This form shall not be used by electronic filers unable
     to timely file a report solely due to electronic difficulties. Filers
     unable to submit a report within the time period prescribed due to
     difficulties in electronic filing should comply with either Rule 201 or
     Rule 202 of Regulation S-T (Section 232.201 or Section 232.202 of this
     chapter) or apply for an adjustment in filing date pursuant to Rule 13(b)
     of Regulation S-T (Section 232.13(b) of this chapter).