Thyristors includes silicon controlled rectifiers (SCRs) and triode for alternating current (Triacs). SCRs are unidirectional devices,can conduct current only in one direction, and it can be triggered normally only by a positive trigger current going into the gate as opposed to TRIACs. Low power applications include circuit breakers like GFCI （ground-fault circuit interrupter) and engine ignition circuits. High power applications include motor control, battery chargers, SMPS and UPS etc. Topdiode's SCRs have a current range from 1A~100A, voltage range from 200V~2000V and are available in a variety of industry standard, SMD and through-hole power packages.

TRIACs differ from SCRs in that they allow current flow in both directions. Topdiode offers the original four-quadrant triacs and the much improved three-quadrant triacs. Triacs are mainly used in home appliances, electrical (water) heaters, electric tools，lamp dimmers and motor control applications. Topdiodes triacs have a current range from 1A to 80A and voltages upto 2000V. They are available in a variety of industry standard, SMD and through-hole power packages.

A thyristor is a type of semiconductor device that acts as a switch, controlling the flow of electrical current in a circuit. Thyristors are typically used for switching and controlling high voltage or current in applications where the power must be turned on or off. They are made of four layers of semiconductor material (P-N-P-N) and typically have three terminals: anode, cathode, and gate.

Difference Between SCR & TRIAC

SCR (Silicon Controlled Rectifier):

1. Structure: An SCR is a type of thyristor that has a single direction of current flow. It has four layers (P-N-P-N) and three terminals: anode, cathode, and gate.
2. Control: It is controlled by a gate signal. Once triggered, it remains in the "on" state (conducting) until the current flowing through it drops below a certain threshold (called the "holding current").

TRIAC (Triode for Alternating Current):

1. Structure: A TRIAC is similar to an SCR but can conduct current in both directions, making it suitable for AC applications. It has a similar structure but with an additional set of layers.
2. Control: Like an SCR, a TRIAC is controlled by a gate signal, but it can conduct during both halves of an AC cycle, allowing bidirectional control.

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