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TRIAC
Sign in to saveAlso known as triode for alternating current, bidirectional triode thyristor, bilateral triode thyristor, symistor, symmetric thyristor
A TRIAC (triode for alternating current; also bidirectional triode thyristor or bilateral triode thyristor) is a three-terminal electronic component that conducts current in either direction when triggered. The term TRIAC is a genericized trademark.
Key facts
- Electronic component.name
- TRIAC
- Electronic component.image
- Kyocera FS-C5200DN - Murata MPS7511 power supply board - Renesas BCR12PM-14L-5156.jpg
- Electronic component.caption
- A small plastic-cased TRIAC device mounted on a printed circuit board
- Electronic component.type
- Active
- Electronic component.symbol
- 90px
- Electronic component.pins
- Terminal1, gate and Terminal2
via Wikipedia infobox
Wikidata facts
- Image
- TRIAC (smial).jpg
Show 1 more fact
- Commons category
- Triacs
via Wikidata · CC0
~20 min read
Article
18 sectionsContents
- Operation
- Quadrant 1
- Quadrant 2
- Quadrant 3
- Quadrant 4
- Issues
- Gate threshold current, latching current, and holding current
- Static dv/dt
- Critical di/dt
- Commutating dv/dt and di/dt
- Snubber circuits
- Application
- Example data
- {{anchor|HiCom|3Q|ACS|Alternistor|Snubberless}}High commutation (two- and three-quadrant) TRIACs
- See also
- References
- Further reading
- External links
A TRIAC (triode for alternating current; also bidirectional triode thyristor or bilateral triode thyristor) is a three-terminal electronic component that conducts current in either direction when triggered. The term TRIAC is a genericized 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.