Test21 Inc. is the world's leading designer and manufacturer of high-end
printed circuit boards, with a main focus on all major aspects of the
semiconductor testing industry.
Test21 serves semiconductor design companies, silicon wafer foundries, test
houses, probe card manufacturers, and ATE manufacturers worldwide,
bringing design, engineering, production, and other capabilities together,
offering customers a single interface solution to all semiconductor
The company is based in California and operates in Taiwan, Japan, UK, China, and