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Allegro MicroSystems and UMC Sign Long-Term Foundry Agreement

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Allegro Secures Wafer Capacity to Support Projected Growth

Allegro MicroSystems (Allegro), a leader in developing high-performance
power and sensing semiconductors, and United Microelectronics
Corporation (NYSE:UMC, TWSE:2303)) ("UMC"), a leading global
semiconductor foundry, have signed a long-term agreement for UMC to
continue as Allegro's primary foundry wafer manufacturer.

The agreement covers technical collaboration and establishes capacity at
UMC for Allegro's proprietary automotive-grade technologies, supporting
the strong long-term growth projections of Allegro. The two companies
established a previous agreement in 2012 that initiated the transfer and
production of Allegro's own technologies to UMC's manufacturing
facilities.

"We wanted a partnership that would help us expand Allegro's business
and portfolio. UMC has been extremely successful in satisfying the
technology, quality, and production needs of our customers," said Thomas
Teebagy, senior vice president of operations and quality. "UMC has the
capacity and technology to accommodate Allegro's projected growth and
increasing wafer shipment requirements."

Allegro has previously ported its ABCD4 and ABCD6 processes to UMC and
will continue to port its own processes under the newly signed
agreement. Currently, the two companies are developing Allegro's A10S
and A10P 0.18um BCD technologies as well as supporting custom, leading
edge GMR / TMR on-silicon integration.

Bruce Lai, vice president of 8" operations at UMC said, "UMC's sustained
effort towards developing robust specialty and automotive technologies
has enabled us to become a foundry leader in automotive IC production,
with AEC-Q100 qualified processes backed by manufacturing that complies
with rigorous ISO TS-16949 automotive quality standards for all UMC
fabs. We value our long-standing partnership with Allegro to produce
their automotive ICs, and we are pleased to extend our cooperation
through this new agreement to support their future growth requirements
and help enhance their market position."

About Allegro MicroSystems

Allegro MicroSystems, (Allegro) is a leader in developing
high-performance power and sensing semiconductors. Allegro's innovative
solutions serve high-growth applications within the automotive market,
with additional focus on industrial and consumer/computing solutions.
Allegro is headquartered in Manchester, New Hampshire (USA) with design,
applications, and sales support centers located worldwide. For more
information, please visit www.allegromicro.com.

About UMC

UMC (NYSE:UMC, TWSE: 2303)) is a leading global semiconductor foundry
that provides advanced IC production for applications spanning every
major sector of the electronics industry. UMC's comprehensive foundry
solutions enable chip designers to leverage the company's sophisticated
technology and manufacturing, which include world-class 28nm
High-K/Metal Gate technology, 14nm FinFET volume production, specialty
process platforms specifically developed for AI, 5G and IoT applications
and the automotive industry's highest-rated AEC-Q100 Grade-0
manufacturing capabilities for the production of ICs found in vehicles.
UMC's 11 wafer fabs are strategically located throughout Asia and are
able to produce over 600,000 wafers per month. The company employs more
than 20,000 people worldwide, with offices in Taiwan, China, Europe,
Japan, Korea, Singapore, and the United States. UMC can be found on the
web at http://www.umc.com.

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