Kopin is the world's dominant provider of GaAs (gallium arsenide) Heterojunction Bipolar Transistor (HBT) wafers with a dominant share of the worldwide merchant market. These high-performance vertical transistors form the basis of advanced power amplifier circuits that have been inserted into billions of advanced cell phones and wireless local area networks (LANs) as well as high-speed circuits for fiber optic networks. Kopin HBTs generate clearer high-frequency signals, consume less power, and thus enable longer talk time than other types of transistors.

Kopin was the first company to commercialize volume production of GaAs HBT wafers in 1996, and has led the market in innovation and volume production ever since. Kopin has shipped more than 900,000 HBT wafers, generating several hundred million dollars of revenue for Kopin and helping create billions of dollars of revenue for its power amplifier customers. Today Kopin has the most advanced HBT technologies and high-volume production facilities in the world. Kopin is shipping transistor wafers to support the production of millions of cellular handsets each and every day.