Company provides conference-call details

PHOENIX, Ariz. – January 22, 2009 - ON Semiconductor Corporation (Nasdaq: ONNN) plans to announce its financial results for the fourth quarter ending December 31, 2008, after the market closes on Wednesday, February 4, 2009.

The company will host a conference call at 5:00 p.m. Eastern Time (ET) on February 4, following the release of its financial results. Investors and interested parties can access the conference call in the following manner:

• Webcast: A live webcast of the conference call will be available via the Investors section of the company’s website at https://www.onsemi.com. The re-broadcast of the call will be available at this site approximately one hour following the live broadcast and will continue for 30 days.

• Teleconference: A telephone conference of the earnings report can be accessed by dialing 888-546-9664 (U.S./Canada) or 706-679-4331 (International). In order to join this conference call, you will be required to provide the Conference ID Number – which is 82216241.

• Teleconference Replay: Approximately one hour following the live broadcast, the company will provide a dial-in replay that will continue to be available through February 11, 2009. To listen to the teleconference replay, call 800-642-1687 (U.S./Canada) or 706-645-9291 (International). You will be required to provide the Conference ID Number – which is 82216241.

About ON Semiconductor
With its global logistics network and strong product portfolio, ON Semiconductor (Nasdaq: ONNN) is a preferred supplier of high performance, energy efficient, silicon solutions to customers in the power supply, automotive, communication, computer, consumer, medical, industrial, mobile phone, and military/aerospace markets. The company’s broad portfolio includes power, signal management, analog, DSP, advance logic, clock management, non-volatile memory and standard component devices. Global corporate headquarters are located in Phoenix, Arizona. The company operates 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 https://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 Web site in this news release, such information on the Web site is not to be incorporated herein.

About onsemi

onsemi (Nasdaq: ON) is driving disruptive innovations to help build a better future. With a focus on automotive and industrial end-markets, the company is accelerating change in megatrends such as vehicle electrification and safety, sustainable energy grids, industrial automation, and 5G and cloud infrastructure. With a highly differentiated and innovative product portfolio, onsemi creates intelligent power and sensing technologies that solve the world’s most complex challenges and leads the way in creating a safer, cleaner, and smarter world.

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onsemi and the onsemi logo are 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.

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