Allegro and UMC Establish Foundry Partnership

                Allegro and UMC Establish Foundry Partnership

UMC to Manufacture Allegro's BCD Product Lines

PR Newswire

WORCESTER, Mass. and HSINCHU, Taiwan, Sept. 21, 2012

WORCESTER, Mass. and HSINCHU, Taiwan, Sept.21, 2012 /PRNewswire/ --Allegro
MicroSystems, Inc., a leader in developing, manufacturing and marketing
high-performance semiconductors, and United Microelectronics Corporation
(NYSE: UMC; TWSE: 2303) ("UMC"), a leading global semiconductor foundry, today
announced a strategic agreement between the two companies for Allegro to
utilize UMC for foundry technology and manufacturing. The companies will start
production with Allegro's 4th generation 0.6um BCD (ABCD4) commercial product
line later this year.

"The agreement between Allegro and UMC is a significant corporate initiative
and one that has a direct impact on the strategic growth of our company.
Allegro, as well as our customer base, will realize many benefits as a result
of this alignment," said Ravi Vig, VP Business Development at Allegro
MicroSystems, Inc.

W.Y. Chen, Chief Operating Officer at UMC, said,"We are pleased to extend
UMC's world-leading foundry services to help Allegro strengthen their
production base. Our manufacturing leadership and ability to tailor our
capacity to meet customer requirements will enhance the competitiveness of
leading IC providers such as Allegro. We look forward to serving Allegro's
foundry needs and growing this partnership for years to come."

Allegro has finished porting its ABCD4 process to UMC and has entered pilot
production. Full production is expected to begin at UMC within the coming
months. This wafer process will support its commercial power IC customers. In
addition, Allegro is also porting its 6th generation ABCD6 process, with pilot
production expected to start in 2013. This process will support both sensor
and power IC customers.

About Allego

Allegro MicroSystems, Inc. is a leader in developing, manufacturing and
marketing high-performance semiconductors. Allegro's innovative solutions
serve high-growth applications within the automotive market, with additional
focus on office automation, industrial, and consumer/communications solutions.
Allegro is headquartered in Worcester, Massachusetts (USA) with design,
applications, and sales supportcenters located worldwide. Further information
about Allegro can be found at

About UMC

UMC (NYSE: UMC, TWSE: 2303) is a leading global semiconductor foundry that
provides advanced technology and manufacturing for applications spanning every
major sector of the IC industry. UMC's customer-driven foundry solutions allow
chip designers to leverage the company's leading-edge processes, which include
28nm poly-SiON and gate-last High-K/Metal Gate technology, mixed
signal/RFCMOS, and a wide range of specialty technologies. Production is
supported through 10 wafer manufacturing facilities that include two advanced
300mm fabs; Fab 12A in Taiwan and Singapore-based Fab 12i. Fab 12A consists of
Phases 1-4 which are in production for customer products down to 28nm.
Construction is underway for Phases 5&6, with future plans for Phases 7&8. The
company employs over 13,000 people worldwide and has offices in Taiwan, Japan,
Singapore, Europe, and the United States. UMC can be found on the web at

Note from UMC Concerning Forward-Looking Statements

Some of the statements in the foregoing announcement are forward looking
within the meaning of the U.S. Federal Securities laws, including statements
about future outsourcing, wafer capacity, technologies, business relationships
and market conditions. Investors are cautioned that actual events and results
could differ materially from these statements as a result of a variety of
factors, including conditions in the overall semiconductor market and economy;
acceptance and demand for products from UMC; and technological and development
risks. Further information concerning these risks is included in UMC's filings
with the U.S. SEC, including on Form F-1, F-3, F-6 and 20-F, each as amended.

Editorial Contacts:

Allegro MicroSystems, Inc.
                                    United Microelectronics Corporation
Stephanie Fennelly
                                    Richard Yu
Director - Marketing Communications
                                    +886-2-2658-9168 ext. 16951
Tel: +1-508-854-5363

SOURCE United Microelectronics Corporation

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