EXHIBIT 99. 1

ON Semiconductor Reports First Quarter 2012 Results

For the first quarter of 2012, highlights include:

PHOENIX, Ariz. – May 2, 2012 – ON Semiconductor Corporation (Nasdaq: ONNN) today announced that total revenues in the first quarter of 2012 were $744.4 million, a decrease of approximately 3 percent from the fourth quarter of 2011. During the first quarter of 2012, the company reported GAAP net income of $28.2 million, or $0.06 per fully diluted share. The first quarter 2012 GAAP net income was impacted by $29.3 million of special items which include restructuring charges and other items. The complete special item details can be found in the attached schedules.

First quarter 2012 non-GAAP net income was $57.5 million, or $0.12 per share on a fully diluted basis compared to $58.4 million, or $0.13 per share on a fully diluted basis for the fourth quarter of 2011. A reconciliation of these non-GAAP financial measures (and other non-GAAP measures used elsewhere in this release, such as non-GAAP gross margin and adjusted EBITDA) to the company’s most directly comparable measures prepared in accordance with U.S. GAAP are set forth in the attached schedules and on our website at http://www.onsemi.com/.

On a mix-adjusted basis, average selling prices for ON Semiconductor in the first quarter of 2012 were down one to two percent when compared to the fourth quarter of 2011. Total company GAAP and non-GAAP gross margin in the first quarter was 32.9 percent.

Adjusted EBITDA for the first quarter of 2012 was $120.1 million. Adjusted EBITDA for the fourth quarter of 2011 was $122.0 million.

“Our overall business stabilized in the first quarter of 2012 and we believe we have passed the bottom of the current semiconductor cycle,” said Keith Jackson, ON Semiconductor president and CEO. “Although sales were sequentially lower in the first quarter of 2012, through better mix management and effective cost control measures, we were able to maintain gross margins in-line with the fourth quarter of 2011. During the quarter, we also reduced internal inventories by approximately one percent and inventories within the distribution channel by approximately 14 percent. We enter the second quarter with distribution inventory dollars at the

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lowest levels since the third quarter of 2010. We expect sequential revenue growth in the second quarter and start the quarter with higher backlog than when we started the first quarter.”

SECOND QUARTER 2012 OUTLOOK

“Based upon product booking trends, backlog levels and estimated turns levels, we anticipate that total ON Semiconductor revenues will be approximately $745 to $785 million in the second quarter of 2012,” Jackson said. “Backlog levels for the second quarter of 2012 represent approximately 80 to 85 percent of our anticipated second quarter 2012 revenues. We expect that average selling prices for the second quarter of 2012 will be down approximately one to two percent when compared to the first quarter of 2012. The non-GAAP outlook for the second quarter of 2012 includes stock-based compensation expense of approximately $8 to $10 million.”

In the second quarter, the company expects to incur special item charges of approximately $55 to $65 million in operating expenses. The majority of these charges are related to a voluntary retirement program for employees of certain of our SANYO Semiconductor Products Group subsidiaries to better align the group’s cost structure to its current revenue levels.

The following table outlines ON Semiconductor’s projected second quarter of 2012 GAAP and non-GAAP outlook.

ON SEMICONDUCTOR Q2 2012 BUSINESS OUTLOOK

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TELECONFERENCE

ON Semiconductor will host a conference call for the financial community at 4:30 p.m. Eastern Time (ET) on May 2, 2012, to discuss this announcement and ON Semiconductor’s first quarter 2012 results. The company will also provide a real-time audio webcast of the teleconference on the “Investor” page of its website at http://www.onsemi.com, along with the related call script. The webcast replay will be available at this site approximately one hour following the live broadcast and will continue to be available for approximately 30 days following the conference call. Investors and interested parties can also access the conference call through a telephone call by dialing (888) 546-9664 (U.S./Canada) or (973) 935-8144 (International). In order to join this conference call, you will be required to provide the Conference ID Number – which is 74337898. Approximately one hour following the live broadcast, the company will provide a dial-in replay that will continue to be available through May 9, 2012. To listen to the teleconference replay, call (855) 859-2056 (U.S./Canada) or (404) 537-3406 (International). You will be required to provide the Conference ID Number – which is 74337898.

About ON Semiconductor

ON Semiconductor (Nasdaq: ONNN) is a premier supplier of high performance, silicon solutions for energy efficient electronics. The company's broad portfolio of power and signal management, logic, discrete and custom devices helps customers effectively solve their design challenges in automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace and power applications. ON Semiconductor operates a world-class, value-added supply chain and a network of manufacturing facilities, sales offices and design centers in key markets throughout North America, Europe, and the Asia Pacific regions. For more information, visit http://www.onsemi.com.

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ON Semiconductor and the ON Semiconductor logo are registered trademarks of Semiconductor Components Industries, LLC. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. Although the company references its website in this news release, information on the website is not to be incorporated herein.

This document contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical facts, included or incorporated in this document could be deemed forward-looking statements, particularly statements about the future financial performance of ON Semiconductor. These forward-looking statements are often characterized by the use of words such as “believes,” “estimates,” “expects,” “projects,” “may,” “will,” “intends,” “plans,” or “anticipates,” or by discussions of strategy, plans or intentions. All forward-looking statements in this document are made based on information available to us as of the date of this release, our current expectations, forecasts and assumptions, and involve risks, uncertainties and other factors that could cause results or events to differ materially from those expressed in the forward-looking statements. Among these factors are the uncertainty surrounding natural disasters such as the ongoing impact of the recent flooding in Thailand, including our ability to effectively shift production to other facilities in order to maintain supply continuity and related revenues for our customers, the fact that the timing of events could differ materially from those anticipated, uncertainties as to restructuring, impairment and other costs and charges including the potential for unanticipated charges and/or lost revenues not currently contemplated. Other factors include poor economic conditions and markets (including current credit and financial conditions), effects of exchange rate

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fluctuations, the cyclical nature of the semiconductor industry, changes in demand for our products, changes in inventories at our customers and distributors, technological and product development risks, enforcement and protection of our intellectual property rights and related risks, availability of raw materials, electricity, gas, water and other supply chain uncertainties, our ability to effectively shift production to other facilities in order to maintain supply continuity for our customers, variable demand and the aggressive pricing environment for semiconductor products, our ability to successfully manufacture in increasing volumes on a cost-effective basis and with acceptable quality for our current products, competitor actions including the adverse impact of competitor product announcements, pricing and gross profit pressures, loss of key customers, order cancellations or reduced bookings, changes in manufacturing yields, control of costs and expenses and realization of cost savings from restructurings (including a voluntary retirement program for employees within our SANYO Semiconductor Products Group) and synergies, significant litigation, risks associated with decisions to expend cash reserves for various uses such as debt prepayment or acquisitions rather than to retain such cash for future needs, risks associated with acquisitions and dispositions (including from integrating and consolidating, and timely filing financial information with the Securities and Exchange Commission (“SEC”) for, acquired businesses and difficulties encountered in accurately predicting the future financial performance of acquired businesses, risks associated with our substantial leverage and restrictive covenants in our debt agreements from time to time, risks associated with our worldwide operations including foreign employment and labor matters associated with unions and collective bargaining arrangements as well as man-made and/or natural disasters such as the flooding in Thailand or the Japan earthquake and tsunami affecting our operations and finances/financials, the threat or occurrence of international armed conflict and terrorist activities both in the United States and internationally, risks and costs associated with increased and new regulation of corporate governance and disclosure standards (including pursuant to Section 404 of the Sarbanes-Oxley Act of 2002), risks related to new legal requirements and risks involving environmental or other governmental regulation. Information concerning additional factors that could cause results to differ materially from those projected in the forward-looking statements is contained in ON Semiconductor’s 2011 Annual Report on Form 10-K filed with the SEC on February 22, 2012, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and other of our filings with the SEC. If any of these trends, risks or uncertainties actually occurs or continues, our business, financial condition or operating results could be materially adversely affected, the trading prices of our securities could decline, and investors could lose all or part of their investment. Readers are cautioned not to place undue reliance on forward-looking statements. These forward-looking statements should not be relied upon as representing our views as of any subsequent date and we do not undertake any obligation to update forward-looking statements to reflect events or circumstances after the date they were made.

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ON SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENT OF OPERATIONS

(in millions, except per share data)

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ON SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

UNAUDITED CONSOLIDATED BALANCE SHEET

(in millions)

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ON SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

UNAUDITED RECONCILIATION OF NET INCOME (LOSS) TO ADJUSTED EBITDA* AND

CASH PROVIDED BY OPERATING ACTIVITIES

(in millions)

We believe that non-GAAP financial measures reflect an additional way of viewing aspects of our operations that – when taken together with GAAP results and the reconciliations to corresponding GAAP financial measures that we also provide in our press releases – provide a more complete understanding of factors and trends affecting our business. Because non-GAAP financial measures are not standardized, it may not be possible to compare these financial measures with other non-GAAP financial measures used by ON Semiconductor or other companies, even if they have similar names.

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ON SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

ANALYSIS OF GAAP VERSUS NON-GAAP DISCLOSURES

(in millions, except per share and percentage data)

Total share-based compensation expense, related to the Company’s stock options, restricted stock units, restricted stock awards and employee stock purchase plan is included below.

Non-GAAP Measures

To supplement the consolidated financial results prepared under GAAP, ON Semiconductor uses non-GAAP measures which are adjusted from the most directly comparable GAAP results to exclude items related to amortization of intangible assets, amortization of acquisition-related intangibles, expensing of appraised inventory fair market value step up, inventory valuation adjustments, purchased in-process research and development expenses, restructuring, asset impairments and other, net, goodwill impairment charges, gains and losses on debt prepayment, non-cash interest expense, their related tax effects, income tax adjustments to approximate cash taxes, and certain other special items as necessary. Management does not consider these charges in evaluating the core operational activities of ON Semiconductor. Management uses these non-GAAP measures internally to make strategic decisions, forecast future results and evaluate ON Semiconductor’s current performance. Most analysts covering ON Semiconductor use the non-GAAP measures as well. Given management’s use of these non-GAAP measures, ON Semiconductor believes these measures are important to investors in understanding ON Semiconductor’s current and future operating results as seen through the eyes of management. In addition, management believes these non-GAAP measures are useful to investors in enabling them to better assess changes in ON Semiconductor's core business across different time periods. These non-GAAP measures are not in accordance with or an alternative to GAAP financial data and may be different from non-GAAP measures used by other companies. Because non-GAAP financial measures are not standardized, it may not be possible to compare these financial measures with other companies' non-GAAP financial measures, even if they have similar names.

— Non-GAAP gross profit and gross margin. The use of this non-GAAP financial measure allows management to evaluate the gross margin of the company's core businesses and trends across different reporting periods on a consistent basis, independent of non-cash items including expensing of appraised inventory fair market value step up and amortization of intangible assets. In addition, it is an important component of management’s internal performance measurement and reward process as it is used to assess the current and historical financial results of the business, for strategic decision making, preparing budgets and forecasting future results. Management presents this non-GAAP financial measure to enable investors and analysts to evaluate our revenue generation performance relative to the direct costs of revenue of ON Semiconductor's core businesses.

— Non-GAAP net income and net income per share. The use of these non-GAAP financial measures allows management to evaluate the operating results of ON Semiconductor’s core businesses and trends across different reporting periods on a consistent basis, independent of non-cash items including amortization of intangible assets, amortization of acquisition-related intangibles, expensing of appraised inventory fair market value step up, purchased in-process research and development expenses, restructuring, asset impairments and other, net, goodwill impairment charges, inventory valuation adjustments, gains and losses on debt prepayment, non-cash interest expense, their related tax effects and certain other special items as appropriate. In addition, they are important components of management’s internal performance measurement and reward process as they are used to assess the current and historical financial results of the business, for strategic decision making, preparing budgets and forecasting future results. Management presents these non-GAAP financial measures to enable investors and analysts to understand the results of operations of ON Semiconductor’s core businesses and to compare our results of operations on a more consistent basis against that of other companies in our industry.