Dual In-Line Modules Cut Time and Cost of Upgrading Existing
                             Switches

IRVINE, Calif., Jan. 28, 2010 (GLOBE NEWSWIRE) -- Microsemi Corporation
(Nasdaq:MSCC), a leading manufacturer of high performance analog mixed
signal integrated circuits and high reliability semiconductors, today
released the PD67100(TM) PoE+ module family, which integrates the
company's PD69012 PoE Manager device into an easy-to-integrate dual
in-line memory module (DIMM).

PD67100 DIMMs enable switch designers to reduce the time and cost
required to add IEEE802.3at-2009 PoE+ capability to existing switches,
while retaining the flexibility to use the same switch for both low
power PoE and non-PoE implementation.

Microsemi's new PD67100 family joins the company's existing PD67000
DIMM offering, one of the first to pioneer PoE deployment using the
same modular, field-upgradeable packaging format that is widely used in
memory DIMMs. Microsemi's latest PD67100 DIMMs extend scalability from
a new entry point of 8 ports through a full 48 ports, and dissipate 50
percent less power than their PD67000(TM) predecessors.

"The PD67100 family offers a modular, field-upgradeable complement to
Microsemi's PoE+ PSE integrated circuits, which were the industry's
first to deliver up to 60 watts of power for devices ranging from video
screen transmitters to pan-tilt-zoom cameras, thin clients and laptop
computers," said Daniel Feldman, Director of Marketing for Telecom
products at Microsemi's Analog Mixed Signal Group. "PD67100 PoE+ DIMMs
enable rapid time-to-market for multiple switch platforms, and the
addition of a new, eight-port option addresses requests from customers
who are integrating PoE into the small- to medium-business applications
space."

Product Availability

Samples of the PD67124M, PD67112M and the PD67124S PoE DIMMs are
available immediately. Production for volume shipment is expected to
commence during the first quarter of 2010. The modules are fully IEEE
802.3af-2003 and IEEE802.3at-2009 compliant, and are also capable of
powering pre-standard proprietary solutions.

About Microsemi

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 and reliability, battery optimization, reducing size or
protecting circuits. The principal markets the company serves include
implanted 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 website at http://www.microsemi.com.

The Microsemi Corporation logo is available at
http://www.globenewswire.com/newsroom/prs/?pkgid=1233

"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 the release of the PD67100(TM) PoE+ module
family, which integrates the company's PD69012 PoE Manager device into
an easy-to-integrate dual in-line memory module (DIMM), 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, potential cost
increases, variations in customer order preferences, 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, 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. Additional risk factors may be identified from time to time in
Microsemi's future filings. 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.






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