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TRIAC

TRIAC, from Triode for Alternating Current, is a genericized tradename for an electronic component that can conduct current in either direction when it is triggered (turned on), and is formally called a bidirectional triode thyristor or bilateral triode thyristor. TRIACs are part of the thyristor family and are closely related to silicon-controlled rectifiers (SCR). However, unlike SCRs, which are unidirectional devices (that is, they can conduct current only in one direction), TRIACs are bidirectional and so current can flow in either direction. Another difference from SCRs is that TRIAC current flow can be enabled by either a positive or negative current applied to its gate electrode, whereas SCRs can be triggered only by current going into the gate. To create a triggering current, a positive or negative voltage has to be applied to the gate with respect to the MT1 terminal (otherwise known as A1). Once triggered, the device continues to conduct until the current drops below a certain threshold called the holding current. The bidirectionality makes TRIACs very convenient switches for alternating current circuits, also allowing them to control very large power flows with milliampere-scale gate currents. In addition, applying a trigger pulse at a controlled phase angle in an A.C. cycle allows control of the percentage of current that flows through the TRIAC to the load (phase control), which is commonly used, for example, in controlling the speed of low-power induction motors, in dimming lamps, and in controlling A.C. heating resistors.

SCR > DIAC > TRIAC > Thyristor

Part No.	DS	Manufacturer	D/C	Qty	Region	Action
BTB16-600SWRG		STM	-	1750	South Korea	Request A Quote
BTB16-600SWRG		STM	2022+	1750	Taiwan	Request A Quote

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