A Triac is a solid state AC bi-directional silicon switch. Triacs are normally-open (high impedance) circuits, capable of withstanding a rated blocking voltage until triggered to an on-state. Once triggered, thyristors become a low impedance current path until the main current either stops or drops below a minimum holding current A Sensitive Triac offers a direct interface to microprocessor drivers. They provide guaranteed gate trigger current levels in Quadrants I, II, III and IV of an AC current cycle. A Standard Triac is designed for full wave AC applications to control AC power through full cycle switching or phase control of current to the load element. They provide guaranteed gate trigger current levels in Quadrants I, II, and III of an AC current cycle. An Alternistor Triac is designed specifically to switch highly inductive loads. It offers the same performance characteristics as two electrically separate SCRs wired back-to- back in a single package. They provide guaranteed gate trigger current levels in Quadrants I, II, and III of an AC current cycle.

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Sensitive Triac

Standard Triac

Alternistor Triac