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Thyristors (SCR & TRIAC)

Littelfuse offers a wide range of discrete thyristors designed for reliable switching and overvoltage protection in demanding electronic systems. Our portfolio includes power SCR (silicon-controlled rectifier) thyristors for unidirectional control, TRIACs for bidirectional switching, and integrated QUADRACs combining TRIACs and DIACs for enhanced alternating current performance. We also supply standalone DIACs for precise thyristor gate triggering. Common TRIAC applications and power SCR uses include motor speed regulation, lighting control, and heating systems.

Subcategories under Thyristors (SCR & TRIAC)

AC Switches

High-current electrical systems such as those for tankless water heaters depend on solid state ac switches. Littelfuse offers a specialized thyristor

Fast Thyristors

Use fast thyristors in high-voltage electrical systems that require high-speed, low-loss signal switching. Littelfuse produces these types of power

Gate Turn Off

Variable-speed ac industrial motors, inverters, and traction motors rely on gate turn off (GTO) thyristors. When engaged, the devices block current.

Medium Voltage

Phase control medium voltage thyristors optimize direct current switching in electrical systems carrying voltages up to 6.5 kV and currents below 4

Phase Control

Phase control thyristors control the flow of current through circuits. The gates of the solid state switches open in line with the sine wave of

QUADRAC

A QUADRAC is a thyristor assembly that handles ac switching. Especially suited to serving as dimmer switches for LED bulbs, QUADRACs combine

Silicon-controlled rectifier (SCR) thyristors

SCR

Littelfuse silicon-controlled rectifiers (SCR) and SCR modules for efficient switching offer a broad range of silicon-controlled rectifier solutions

SIDAC

SIDACs, or more properly, silicon diodes for alternating current, primarily serve as pulse current ignition switches in metal halide lamps and xenon

TRIAC

Properly named triodes for alternating current, TRIACs act as thyristors. They serve as solid state switches in heaters, lighting controls, and motor