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Standard and Snubberless Triacs

Standard Triacs are all-pupose AC mains switches with simple and low-current gate drive. They provide the sparkless and non-ageing features of semiconductors that are ideally suited to mains voltage appliances of all sorts. The simple phase angle delayed firing of the gate allows simple dimming for lighting and variable speeds for universal motors.

Snubberless™ Triacs are particularly suited to 3-quadrant and inductive load designs with enhanced switch-off capability. The devices feature a reverse voltage up to 800 V and a maximum current up to 40 A. ST’s package range offers a full through-hole and SMD porfolio: TO-92, SOT-223, DPAK, IPAK, TO-202-3, D²PAK, I²PAK, ISOWATT-220, TO-220(I), RD-91, TOP-3.

The T series is the latest addition to Snubberless Triacs and provides enhanced commutation for a given current rating. Immunity is also improved up to 5 times for a given current rating.

First high-sensitivity 1200 V, 25 A Triac

The new T2550-12 Triac is dedicated to industrial applications such as 3-phase motor soft starters, contactors and protectors. It features a robust switching of up to 240 A of peak surge current and a 1200 V blocking voltage. Housed in both D²PAK, as T2550-12G, and TO-220AB packages, as T2550-12T, it allows a more compact design compared to a mechanical contactor and offers higher performance with a high dV/dt, above 2500 V/µs, and a maximum gate triggering current of 50 mA.