ON Semiconductor Names Bob Mahoney Executive Vice President of Global Sales and Marketing

PHOENIX, Ariz. - August 7, 2006 - ON Semiconductor (Nasdaq: ONNN), a leading industry supplier of power solutions, has named Bob Mahoney Executive Vice President of Global Sales and Marketing. Mr. Mahoney takes on his new responsibilities after successfully directing the company's Sales for the Americas as Vice President. During his tenure with ON Semiconductor, Mr. Mahoney has been instrumental to the company's growth of market share and bottom line profitability. Since joining the company in 2003, he has held executive responsibilities throughout the sales organization - including Vice President of Global Distribution and the Electronic Manufacturing Services Industry (EMSI), and Vice President of North America Sales, Computing Segment Sales and Sales Operations.

"To accelerate the growth of ON Semiconductor's power solutions portfolio, the company was internally realigned at the beginning of the third quarter into four market-based divisions - namely the Digital and Consumer Products Group, the Computing Products Group, the Automotive and Power Regulation Products Group and the Standard Components Group," said Mr. Mahoney. "My first order of business is to better align ON Semiconductor's worldwide sales and marketing efforts to meet the engineering needs and manufacturing challenges of our existing and future customers in these focus application areas."

Mr. Mahoney brings more than 20 years of semiconductor industry experience in sales and sales management to his new role as Executive Vice President of Global Sales and Marketing for ON Semiconductor. Just prior to joining the company, he was Vice President of World Wide Sales for Xicor Semiconductor. Previously, at Altera, he was Vice President of Strategic Accounts. During his career, he has also held sales management roles at Analog Devices and National Semiconductor.

Mr. Mahoney holds both a BA and a Masters degree in Business Administration from LaSalle University. He replaces Bill Bradford - who left ON Semiconductor to accept a position with Freescale Semiconductor.

About ON Semiconductor
With its global logistics network and strong portfolio of power semiconductor devices, ON Semiconductor (Nasdaq: ONNN) is a preferred supplier of power solutions to engineers, purchasing professionals, distributors and contract manufacturers in the computer, cell phone, portable devices, automotive and industrial markets. For more information, please visit ON Semiconductor's website at www.onsemi.com.


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