A small plastic-cased TRIAC device mounted on a printed circuit board
Type
Active
Pin configuration
Terminal1, gate and Terminal2
Electronic symbol
A TRIAC (triode for alternating current; also bidirectional triode thyristor or bilateral triode thyristor[1]) is a three-terminal electronic component that conducts current in either direction when triggered. The term TRIAC is a genericised trademark.
TRIACs are a subset of thyristors (analogous to a relay in that a small voltage and current can control a much larger voltage and current) and are related to silicon controlled rectifiers (SCRs). TRIACs differ from SCRs in that they allow current flow in both directions, whereas an SCR can only conduct current in a single direction. Most TRIACs can be triggered by applying either a positive or negative voltage to the gate (an SCR requires a positive voltage). Once triggered, SCRs and TRIACs continue to conduct, even if the gate current ceases, until the main current drops below a certain level called the holding current.
Gate turn-off thyristors (GTOs) are similar to TRIACs but provide more control by turning off when the gate signal ceases.
The bidirectionality of TRIACs makes them convenient switches for alternating-current (AC). In addition, applying a trigger at a controlled phase angle of the AC in the main circuit allows control of the average current flowing into a load (phase control). This is commonly used for controlling the speed of a universal motor, dimming lamps, and controlling electric heaters. TRIACs are Bipolar devices.
A TRIAC (triode for alternating current; also bidirectional triode thyristor or bilateral triode thyristor) is a three-terminal electronic component that...
Triac may refer to: TRIAC (triode for alternating current), an electronics component Triac (car), a green vehicle Tiratricol, a common thyroid hormone...
devices (i.e. can conduct current only in one direction) as opposed to TRIACs, which are bidirectional (i.e. charge carriers can flow through them in...
structures may be used. Behavior is similar to the voltage breakdown of a triac without a gate terminal. When breakdown occurs, internal positive feedback...
device, called a TRIAC, is able to work in both directions. This added capability, though, also can become a shortfall. Because the TRIAC can conduct in...
Médéric Rousseau in 1875. The home of Braastad and Tiffon is Château de Triac. It is situated in the cru Petite Champagne in the cognac area, France....
Tiratricol (also known as TRIAC or triiodothyroacetic acid) is a thyroid hormone analogue. Triiodothyroacetic acid is also a physiologic thyroid hormone...
Interpreters of Catalonia) and Traductors i Intèrprets Associats pro-Col·legi (TRIAC) (Associated Translators and Interpreters Professional Body). ATIC was founded...
that makes the diode conduct appreciably in reverse. Some devices (such as TRIACs) also have a forward breakdown voltage. Materials are often classified as...
semiconductor device to perform switching—often a silicon-controlled rectifier or triac). Early telephone systems used an electromagnetically operated Strowger...
operated in California from 2008 to 2011. Their best-known product was the Triac, a three-wheeled car that never entered production. Green Vehicles was co-founded...
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