July 14, 2008

Tanaiste and ON Semiconductor Announce New R&D Centre for Limerick, Ireland

Tanaiste and Minister for Enterprise, Trade and Employment Mary Coughlan and ON Semiconductor (Nasdaq: ONNN), a premier supplier of high performance energy efficient silicon solutions headquartered in Phoenix, Arizona, U.S. - today announced the establishment of a new Research and Development Centre at Raheen Business Park, Limerick, with the support of IDA Ireland. This centre will create 49 high-caliber jobs for semiconductor designers and engineers.

ON Semiconductor designs, manufactures, and markets power and data management semiconductors, and standard semiconductor components worldwide. The new R&D centre in Limerick will become a Centre of Expertise in digital power management and thermal management for next generation processors. It will develop controller and driver integrated circuits for next generation processors in servers, gaming consoles, desktop and laptop computers. At full capacity, the Centre will employ 49 people, 28 of whom are already in place.

Tanaiste Mary Coughlan TD, at the official opening of the new premises today, said, "This investment is a step-up in product complexity and value for ON Semiconductor and is expected to represent a higher level of technical innovation. The choice of Limerick for this investment is a major endorsement of Ireland's ability to successfully implement such technologically advanced R&D projects, and to meet the company's recruitment needs for high-caliber R&D semiconductor designers and engineers. It is also an important vote of confidence in the existing Limerick group, particularly as it was won against strong competition for the project from other ON Semiconductor sites worldwide. This investment is a further important development for the growing cluster of IC Design companies in the mid-west region."

"The success of ON Semiconductor to-date has been based on our competency to manufacture and supply high quality, high volume individual products at competitive cost," said Bill Schromm, ON Semiconductor senior vice president and general manager of Computing Products. "This investment will enable ON Semiconductor to develop its global market share and to successfully compete in the increasingly challenging and ever-changing industry in which it operates. We are confident that our choice of the Limerick group for this investment is the right decision because of the success of that operation to date and our experience of Ireland's can-do, flexible, pro-business environment which is ideal for our business."

About ON Semiconductor

With its global logistics network and strong product portfolio, ON Semiconductor (Nasdaq: ONNN) is a leading 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, analog, DSP, mixed-signal, advance logic, clock management 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 http://www.onsemi.com.

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.