| 摘要 |
A planar integrated circuit comprising four NPN (or PNP) transistors sharing a common collector, with four emitter-base leads between adjacent pairs of transistors. The effective circuit is a lateral triac comprising eight transistors in a novel transistor bridge construction and having all active junctions reaching a single surface. As a result of symmetrical construction a gate current applied across one of two gate terminals and an associated main terminal, or a light-generated photocurrent, triggers the device to control an ac circuit. A preferred embodiment includes a two stage base diffusion at particular impurity levels, thereby producing devices capable of controlling ac line voltages, i.e. 120 volts. |
