Excelliance Mos Corporation

Excelliance Mos Corporation (also known as Excelliance MOS Corp. or EMC) is a public Taiwanese semiconductor company headquartered in Zhubei, Taiwan. Founded in either 1997 or 2008, the company has been publicly listed with stock code 5299 since January 23, 2018. As of 2025, Excelliance Mos Corporation employed between 51 and 100 individuals.

The company specializes in the design, manufacture, and sale of power components and integrated circuits. Its product portfolio includes power MOSFETs, AC/DC controllers, DC/DC power ICs, buck converters, power switches, and linear regulators. These components are widely used in consumer electronics such as laptops, desktop computers, LCD TVs, surveillance cameras, digital cameras, mobile phones, power supplies, electric tools, automobiles, and motorcycles.

Excelliance Mos Corporation's patent litigation posture, based on tracked cases, indicates an operating company engaged in defensive patent challenges rather than assertion of its own portfolio as a plaintiff. The company has one tracked case, appearing as a plaintiff (petitioner) in an inter partes review (IPR) before the Patent Trial and Appeal Board (PTAB). This single case, Excelliance Mos Corporation v. Force MOS Technology Co. Ltd., was filed on April 24, 2025.

This PTAB action is notable given recent related litigation. Force MOS Technology Co. Ltd. previously won a patent infringement lawsuit against ASUS in the U.S. District Court for the Eastern District of Texas, where Excelliance Mos's EMB20N03V MOSFET product was identified as an infringing component. Excelliance Mos Corporation's IPR against Force MOS Technology Co. Ltd. likely represents a strategic move to challenge the validity of a patent asserted against products incorporating its technology.