Assembly and Test semiconductor companies

Signetics Corporation was an American electronics manufacturer specifically established in Silicon Valley to make integrated circuits. Founded in 1961, they went on to develop a number of early microprocessors and support chips, as well as the widely used 555 timer chip. The company was bought by Philips in 1975 and incorporated in Philips Semiconductors (now NXP).

Taiwanese manufacturer of semiconductor testing products

a semiconductor product packaging and test services provider