Thyristors - TRIACs

TRIACs are three-terminal switching devices similar to thyristors (SCRs), but they are constructed by combining two SCRs in anti-parallel, enabling bidirectional conduction. Typically used in AC circuits, TRIACs can control the conduction and cutoff of current, making them suitable for various power control and switching applications.

How do TRIACs work？

A TRIAC (Triode for Alternating Current) is a semiconductor device primarily used for controlling AC circuits. Essentially comprised of two anti-parallel SCRs (Silicon Controlled Rectifiers), it can control current bidirectionally. TRIAC has three terminals: Main Terminal 1 (MT1), Main Terminal 2 (MT2), and Gate. When the Gate receives a sufficient triggering signal, the TRIAC conducts current in either direction, allowing the flow of electricity. The conduction state of the TRIAC persists until the AC voltage drops to a certain level, typically at the zero-crossing point, at which the TRIAC turns off, preparing for the next control cycle.

What are TRIACs used for？

As bidirectional control devices, TRIACs offer flexible control capabilities for AC circuits and are commonly used where control of AC power is necessary.

• Ceiling fan speed controllers
•  AC light dimmer circuits
•  Heating control
•  Power supplies

At JAK Electronics, you will discover a range of products beyond TRIACs, including DIACs, SCRs, and more.