Exhibit 99.1

Semtech Announces Third Quarter of Fiscal Year 2012 Results and Expansion of Stock Repurchase Plan

• Quarterly Revenue of $124M
• Operating Profit up 33% from prior year quarter
• Diluted Earnings Per Share of $0.40, up 60% from prior year quarter
• Repurchased 1.4M shares of stock
• Quarterly cash flow from operations of $33M or 27% of revenue

CAMARILLO, Calif.--(BUSINESS WIRE)--November 30, 2011--Semtech Corporation (Nasdaq: SMTC), a leading supplier of analog and mixed-signal semiconductors, today reported unaudited financial results for its third quarter of fiscal year 2012, which ended October 30, 2011. The company also announced that its Board of Directors approved increasing the existing stock repurchase authorization by $50 million. Prior to the increase, the company had $20 million remaining in the authorization implemented in March 2008 and amended in August 2011.

Net revenue for the third quarter of fiscal year 2012 was $123.9 million, up 0.7 percent from the third quarter of fiscal year 2011 and down 4.8 percent from the second quarter of fiscal year 2012.

Net income for the third quarter of fiscal year 2012, computed in accordance with U.S. generally accepted accounting principles (GAAP), was $27.0 million or 40 cents per diluted share. This compares to GAAP net income of $16.1 million or 25 cents per diluted share in the third quarter of fiscal year 2011 and GAAP net income of $27.1 million or 40 cents per diluted share in the second quarter of fiscal year 2012. Net income for the third quarter of fiscal year 2012 was impacted by several discrete items, including reorganization charges, expenses associated with evaluating potential acquisition targets, and the impairment of acquired intangible assets, offset by a tax benefit from the release of certain reserves for uncertain tax positions.

GAAP gross profit margin for the third quarter of fiscal year 2012 was 59.2 percent compared to 60.0 percent in the third quarter of fiscal year 2011 and 60.4 percent in the second quarter of fiscal year 2012.

To facilitate the complete understanding of comparable financial performance between periods, Semtech also presents performance results net of certain non-cash and one-time items. Semtech's non-GAAP results exclude the following items:

• Stock-based compensation expense
• Transaction and other expenses related to evaluating potential acquisition targets
• Expenses related to class action litigation and ongoing stock option related matters, net of insurance recoveries
• Amortization of acquired intangible assets
• Impairment of acquired intangible assets
• Reorganization costs

Excluding the items listed above, non-GAAP net income for the third quarter of fiscal year 2012 was $35.0 million or 52 cents per diluted share. Non-GAAP net income was $30.4 million or 47 cents per diluted share in the third quarter of fiscal year 2011 and was $33.2 million or 49 cents per diluted share in the second quarter of fiscal year 2012. The release of reserves for uncertain tax positions benefited non-GAAP net income by approximately 5 cents per diluted share in the third quarter of fiscal year 2012.

Non-GAAP gross profit margin for the third quarter of fiscal year 2012 was 59.4 percent. Non-GAAP gross profit margin for the third quarter of fiscal year 2011 was 60.2 percent and 60.6 percent in the second quarter of fiscal year 2012.

Semtech had $317.5 million of cash, cash equivalents and marketable securities as of October 30, 2011, which is net of $30 million used to repurchase 1.4 million shares of stock in the quarter. This compares to $313.6 million in cash, cash equivalents and marketable securities at the end of the second quarter of fiscal year 2012.

Mohan Maheswaran, Semtech's President and Chief Executive Officer, stated, "During the third quarter of fiscal year 2012, we posted revenue in line with our prior expectations and carefully managed expenses in light of the overall softness in orders. In Q3 we posted a record number of design wins and released 25 new products which are positive indicators for future growth. As we enter our seasonally weakest quarter, we see continued macro-economic uncertainty. In addition we also expect our Q4 results to be adversely impacted by the recent floods in Thailand.”

The results announced today are preliminary, as they are subject to customary quarterly review procedures by the Company's independent registered public accounting firm. As such, these results are subject to revision until the Company will have filed its quarterly report on Form 10-Q for the third quarter of fiscal year 2012.

Fourth Quarter of Fiscal Year 2012 Outlook

• Net sales are expected to be in the range of $102 million to $108 million
• GAAP gross profit margin is expected to be down 100 to 240 basis points
• GAAP SG&A expense is expected to be in the range of $22.0 million to $23.0 million
• GAAP R&D expense is expected to be approximately $20.0 million
• Stock-based compensation expense, which is included in the preceding estimates, is expected to be approximately $5.7 million, categorized as follows: $0.2 million cost of sales, $3.5 million SG&A, and $2.0 million R&D
• Amortization of acquired intangible assets is expected to be approximately $2.1 million
• GAAP tax rate is expected to be in the range of 9% to 11%
• GAAP earnings are expected to be in the range of 18 to 24 cents per diluted share
• Non-GAAP earnings are expected to be in the range of 27 to 33 cents per diluted share
• Fully diluted share count is expected to be approximately 67 million
• Capital expenditures are expected to be approximately $5 million

Non-GAAP Financial Measures

To supplement the Company's consolidated financial statements prepared in accordance with GAAP, this release includes a non-GAAP presentation of gross profit, net income and earnings per diluted share and free cash flow. To provide additional insight into the Company's fourth quarter outlook, this release includes a presentation of forward-looking non-GAAP earnings per diluted share. All of these non-GAAP measures exclude stock-based compensation, amortization of acquired intangible assets, and the other items detailed above. The non-GAAP measures for the third quarter of fiscal year 2012 also include reorganization charges and transaction and other expenses associated with evaluating potential acquisition targets. These non-GAAP measures are provided to enhance the user's overall understanding of the Company's comparable financial performance between periods. In addition, the Company's management generally excludes such items in managing and evaluating the performance of the business. A further discussion of these non-GAAP financial measures can be found above. Reconciliations of GAAP results for the third quarter of fiscal years 2012 and 2011 and the second quarter of fiscal year 2012, as well as a reconciliation of forward-looking earnings per diluted share for the fourth quarter of fiscal year 2012, appear with the financial statements included with this release. These additional financial measures should not be considered substitutes for any measures derived in accordance with GAAP and may be inconsistent with similar measures presented by other companies.

Forward-Looking and Cautionary Statements

This report contains "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended (the "Securities Act"), and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements are statements other than historical information or statements of current condition and relate to matters such as future financial performance, future operational performance, the anticipated impact of specific items on future earnings, and our plans, objectives and expectations. These forward-looking statements are identified by the use of such terms and phrases as "intends," "goal," "estimate," "expect," "project," "plans," "anticipates," "should," "will," "designed to," "believe," and other similar expressions which generally identify forward-looking statements. Forward-looking statements involve known and unknown risks and uncertainties that could cause actual results and events to differ materially from those projected. Important factors that could cause actual results to differ materially include, but are not limited to: the continuation and/or pace of key trends considered to be main contributors to the Company's growth, such as demand for increased network bandwidth, demand for increasing energy efficiency in the Company's products or end use applications of the products, demand for increasing miniaturization of electronic components; shifts in demand among target customers, and other comparable changes in projected or anticipated markets; adequate supply of components and materials from our suppliers, and of our products from our third-party manufacturers, to include disruptions due to natural causes or disasters, or related extraordinary weather events; the Company's ability to forecast and achieve anticipated revenues and earnings estimates in light of periodic economic uncertainty, to include impacts arising from European and global economic dynamics; the Company's ability to manage expenses to achieve anticipated amounts; and the amount and timing of expenditures for capital equipment deemed necessary or advisable by the Company. Additionally, 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 30, 2011, in the Company's other filings with the SEC, and in material incorporated therein by reference. In light of the significant uncertainties inherent in the forward-looking information included herein, any such forward-looking information 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. Investors are cautioned not to place undue reliance on any forward-looking information contained herein. The Company assumes no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

About Semtech

Semtech Corporation is a leading supplier of analog and mixed-signal semiconductors for high-end consumer, computing, communications and industrial equipment. Products are designed to benefit the engineering community as well as the global community. The company is dedicated to reducing the impact it, and its products, have on the environment. Internal green programs seek to reduce waste through material and manufacturing control, use of green technology and designing for resource reduction. Publicly traded since 1967, Semtech is listed on the NASDAQ Global Select Market under the symbol SMTC. For more information, visit http://www.semtech.com.

Semtech and the Semtech logo are marks of Semtech Corporation.

CONTACT:
Semtech Corporation
Linda Brewton, 805-480-2004
webir@semtech.com