Exhibit 99.1

Semtech Announces Fourth Quarter and Fiscal Year 2013 Results

• Quarterly Revenue of $151 Million up 45% From Prior Year Quarter
• Record Annual Revenue of $579 Million up 20% Year Over Year
• Record Annual Gross Profit
• Record Annual Operating Cash Flow Exceeds $100 Million

CAMARILLO, Calif.--(BUSINESS WIRE)--March 6, 2013--Semtech Corporation (Nasdaq: SMTC), a leading supplier of analog and mixed-signal semiconductors, today reported unaudited financial results for its fourth quarter and fiscal year 2013, which ended January 27, 2013.

Net revenue for the fourth quarter of fiscal year 2013 was $150.6 million, up 44.8 percent from the fourth quarter of fiscal year 2012 and down 6.4 percent from the third quarter of fiscal year 2013. Net revenue for the full fiscal year 2013 was $578.8 million, up 20.4 percent from fiscal year 2012.

Net income for the fourth quarter of fiscal year 2013, computed in accordance with U.S. generally accepted accounting principles (GAAP), was $13.1 million or 19 cents per diluted share. This compares to GAAP net income of $12.4 million or 19 cents per diluted share in the fourth quarter of fiscal year 2012 and GAAP net income of $16.6 million or 25 cents per diluted share in the third quarter of fiscal year 2013. For the full fiscal year 2013, net income was $41.9 million or $0.62 per diluted share, down from $89.1 million or $1.32 per diluted share in fiscal year 2012.

GAAP gross profit margin for the fourth quarter of fiscal year 2013 was 58.4 percent compared to 57.4 percent in the fourth quarter of fiscal year 2012 and 60.2 percent in the third quarter of fiscal year 2013. GAAP gross profit margin for the full fiscal year 2013 was 54.4 percent compared to 59.4 percent in 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
• Acquisition related fair value adjustments
• Transaction and integration related expenses
• Loss contingencies, including environmental reserves
• Intangible amortization and impairments
• Release of prior accrued taxes on foreign earnings
• Option and restatement related expenses
• Effect of enacted tax rate changes

Excluding the items listed above, non-GAAP net income for the fourth quarter of fiscal year 2013 was $33.1 million or 49 cents per diluted share. Non-GAAP net income was $21.6 million or 32 cents per diluted share in the fourth quarter of fiscal year 2012 and was $36.1 million or 53 cents per diluted share in the third quarter of fiscal year 2013. Non-GAAP net income for the full fiscal year 2013 was $114.5 million or $1.70 per diluted share. This compares to Non-GAAP net income for fiscal year 2012 of $119.8 million or $1.78 per diluted share.

Non-GAAP gross profit margin for the fourth quarter of fiscal year 2013 was 61.6 percent. Non-GAAP gross profit margin for the fourth quarter of fiscal year 2012 was 57.6 percent and 63.1 percent in the third quarter of fiscal year 2013. Non-GAAP gross profit margin for the full fiscal year 2013 was 61.3 percent, which compares to 59.6 percent Non-GAAP gross profit margin for fiscal year 2012.

As of January 27, 2013 Semtech had $236.1 million in cash, cash equivalents and marketable securities. This compares to $218.0 million in cash, cash equivalents and marketable securities at the end of the third quarter of fiscal year 2013 and $327.7 million in cash, cash equivalents and marketable securities at the end of fiscal year 2012.

Mohan Maheswaran, Semtech's President and Chief Executive Officer, stated, "Fiscal year 2013 was a pivotal year for Semtech. We closed and successfully integrated the largest acquisition in company history and posted record revenue, gross profit and cash flow. Our innovative product platforms, strategic customer relationships, and fiscal discipline have positioned Semtech to benefit from the continuing improvement in the economy and ongoing strength in the high-growth markets we are targeting."

The results announced today are preliminary, as they are subject to the annual audit by the Company's independent registered public accounting firm. As such, these results are subject to revision until the Company will have filed its annual report on Form 10-K for fiscal year 2013.

First Quarter of Fiscal Year 2014 Outlook

• Net sales are expected to be in the range of $154.0 million to $162.0 million
• GAAP gross profit margin is expected to be flat to be in the range of 59.2% to 59.8%
• The amortization of the fair value adjustment for acquired inventory, which is included in the above GAAP estimate, is expected to be approximately $2.4 million
• Non-GAAP gross profit margin is expected to be in the range of 61.0% to 61.5%
• GAAP SG&A expense is expected to be in the range of $35.4 million to $35.9 million
• GAAP R&D expense is expected to be in the range of $32.3 million to $32.8 million
• Stock-based compensation expense, which is included in the preceding estimates, is expected to be approximately $8.8 million, categorized as follows: $0.3 million cost of sales, $5.1 million SG&A, and $3.4 million R&D
• Amortization of acquired intangible assets is expected to be approximately $7.8 million
• Transaction and integration related expenses of approximately $1.7 million
• Interest and other expense is expected to be approximately $4.1 million
• GAAP tax rate is expected to be in the range of 0% to 2%
• Non-GAAP tax rate is expected to be in the range of 10% to 12%
• GAAP earnings are expected to be in the range of 17 to 24 cents per diluted share
• Non-GAAP earnings are expected to be in the range of 43 to 49 cents per diluted share
• Fully diluted share count is expected to be approximately 68.0 million shares
• Capital expenditures are expected to be approximately $10.0 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 first quarter outlook, this release includes a presentation of forward-looking non-GAAP earnings per diluted share. A further discussion of these non-GAAP financial measures can be found above. The non-GAAP gross profit, net income and earnings per diluted share measures exclude stock-based compensation, amortization of acquired intangible assets, and the other items detailed above. The non-GAAP presentation of free cash flow excludes capital expenditures. 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 the items noted above when managing and evaluating the performance of the business. The financial statements provided with this release include reconciliations of GAAP results for the fourth quarter of fiscal years 2013 and 2012, the third quarter of fiscal year 2013, the full fiscal years 2013 and 2012; a reconciliation of forward-looking earnings per diluted share for the first quarter of fiscal year 2014; and a calculation of free cash flow. 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 29, 2012, 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.

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Semtech and the Semtech logo are marks of Semtech Corporation.

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