June 19, 2008

Microsemi Joins Polycom ARENA Program

IRVINE, Calif., June 19, 2008 (PRIME NEWSWIRE) -- Microsemi Corporation (Nasdaq:MSCC), a leading manufacturer of high performance analog mixed signal integrated circuits and high reliability semiconductors, today announced that it has joined the Polycom ARENA(tm) partner program.

Polycom, a leader in unified collaboration communications, initiated the ARENA program to allow software application providers, hardware device manufacturers, and conferencing solution providers to integrate their products with Polycom's industry leading unified collaboration platform to create new applications.

Microsemi's PowerDsine(r) Systems provide an easy, cost-efficient way to supply power over existing Ethernet infrastructures (PoE) for Polycom SoundPoint(r) IP phones 320/330, 430, 550, 560, 650 and 670. A single Ethernet cable can transmit both data and power to Polycom SoundPoint IP phones, eliminating the need to install new power outlets. Because PowerDsine midspans augment existing communications switches, they also avoid the installation of costly new PoE switches.

The integration of Polycom SoundPoint IP phones with PowerDsine PoE systems includes PowerView Pro(tm) management software that enables comprehensive remote control of power -- from the universal power supply to the end devices -- for improved energy efficiency, reduced electrical costs and enhanced troubleshooting capabilities. The PowerDsine Systems portfolio includes midspan models able to supply up to 32 watts of power and with Gigabit capabilities for the growing number of high power network devices.

"PowerDsine Systems involvement in the Polycom ARENA program delivers an integrated solution for Polycom SoundPoint IP phones that can help customers simplify their deployment and lower costs," said Steven G. Litchfield, Executive Vice President and President of Microsemi's Analog Mixed Signal Group.

"Polycom and its ARENA ecosystem partners such as Microsemi are focused on proliferating new collaborative communications solutions that will benefit organizations worldwide. The PowerDsine Systems solution addresses the need for cost-effective power over Ethernet capability for Polycom SoundPoint IP phones," said Mark Roberts, vice president, Polycom ARENA program. "We are pleased to welcome Microsemi into the Polycom ARENA program and look forward to working them to deliver this important solution to customers."

As part of the agreement, Microsemi will leverage the Polycom platform, brand, and channels to bring their PoE solutions to market. Polycom ARENA ecosystem partners can develop, test and certify interoperability between their solutions and the Polycom platform of voice, video and content collaborative solutions. In addition to platform API's provided to developers, the Polycom ARENA offers a number of marketing and sales tools for business development managers as well as marketing and sales professionals via an online portal. These tools help partners speed time-to-market for their innovative unified collaborative solutions as well as broaden the reach to customers worldwide.

Pricing and Availability

PowerDsine Systems are widely available through authorized distributors, with pricing in the $30-$50 per port range. For more information about PoE solutions, visit Polycom ARENA partner solution showcase at www.polycom.com/ARENA or http://microsemi.com/Powerdsine.

About Polycom ARENA

Polycom ARENA is an ecosystem program designed to expand new applications for Polycom's collaboration technology and accelerate the delivery of new solutions for customers in a variety of industries by enabling software applications providers, hardware device manufacturers, and conferencing solution providers to integrate their products with Polycom's industry leading unified collaboration platform. Polycom ARENA ecosystem partners can develop, test and certify interoperability between their solutions and the Polycom platform of voice, video and content collaborative solutions. Customers benefit from the industry expertise of Polycom ARENA ecosystem partners who are building standards-based solutions that fully interoperate with the Polycom unified collaboration platform and installed base of video conferencing systems. Additional information is available at www.polycom.com/ARENA

About Microsemi Corporation

Microsemi Corporation, with corporate headquarters in Irvine, California, is a leading designer, manufacturer and marketer of high performance analog and mixed signal integrated circuits and high reliability semiconductors. The company's semiconductors manage and control or regulate power, protect against transient voltage spikes and transmit, receive and amplify signals.

Microsemi's products include individual components as well as integrated circuit solutions that enhance customer designs by improving performance, reliability and battery optimization, reducing size or protecting circuits. The company's PowerDsine systems provide a cost-effective way to deliver power over existing Ethernet infrastructures. Principal markets served include implantable medical, defense/aerospace and satellite, notebook computers, monitors and LCD TVs, automotive and mobile connectivity applications. More information may be obtained by contacting the company directly or by visiting its web site at http://www.microsemi.com.

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"Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: Any statements set forth in this news release that are not entirely historical and factual in nature, including without limitation statements concerning our expectations regarding new or existing products or technologies, are forward-looking statements. These forward-looking statements are based on our current expectations and are inherently subject to risks and uncertainties that could cause actual results to differ materially from those expressed in the forward-looking statements. The potential risks and uncertainties include, but are not limited to, such factors as rapidly changing technology and product obsolescence, weakness or competitive pricing environment of the marketplace, uncertain demand for and acceptance of the company's products, adverse circumstances in any of our end markets, results of in-process or planned development or marketing and promotional campaigns, difficulties foreseeing future demand, potential non-realization of expected orders or non-realization of backlog, product returns, product liability, and other potential unexpected business and economic conditions or adverse changes in current or expected industry conditions, difficulties and costs of protecting patents and other proprietary rights, and inventory obsolescence and difficulties regarding customer qualification of products. In addition to these factors and any other factors mentioned elsewhere in this news release, the reader should refer as well to the factors, uncertainties or risks identified in the company's most recent Form 10-K and all subsequent Form 10-Q reports filed by Microsemi with the SEC. The forward-looking statements included in this release speak only as of the date hereof, and Microsemi does not undertake any obligation to update these forward-looking statements to reflect subsequent events or circumstances.

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 CONTACT:  Microsemi Corporation           Financial Contact:           John W. Hohener, Vice President and CFO             (949) 221-7100           Editorial Contact:           Cliff Silver, Corporate Communications Manager             (949) 221-7100