Compare SCR and TRIAC
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SCR
TRIAC
It is an unidirectional device.
It is a bidirectional device.
It is turned-on by only positive gate current.
It can be turned-on by either positive or negative gate current.
Operates only in the first quadrant
Operates in either 1 st or 3rd quadrant.
Anti-parallel SCRs are used for bidirectional current flow.
TRIAC is equivalent to a pair of antiparallel connected SCRs.
It has better gate-current sensitivity.
It has poor gate-current sensitivity as compared to SCR.
It has lower turn-on & turn-off times as compared to TRIAC.
It has higher turn-on & turn-off times as compared to SCR.
For bidirectional current applications, two SCRs & two heat sinks require more space.
For bidirectional current applications, one TRIAC & one heat sink require less space.
Firing circuit design is simple.
More careful firing circuit design is required.
Higher voltage & current ratings as compared to TRIAC.
Lower voltage & current ratings as compared to SCR.
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It is employed in large power applications including large power supplies, DC motor drives, lighting and heating, Static VAR compensators, Electronic circuit breakers etc. It is employed in low and medium power applications including lamp dimmer, heating control, zero voltage switched AC relay, small AC motor control etc.


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