Difference between SCR and TRIAC

Symbols of SCR and TRIAC

The symbol of SCR is

Difference between SCR and TRIAC

 

The symbol of TRIAC is

Symbols of SCR and TRIAC

The difference between SCR and TRIAC is given below:

SCR TRIAC
It is a unidirectional device, i.e., it can conduct current in forward direction only. It is a bidirectional device, i.e. it can conduct current in forward as well as reverse direction.
It is available with a large current and voltage ratings. It is available for lower current rating as compared to that of SCR.
It has a fast turn-OFF and therefore can be used to switch a.c. supply frequencies upto few kHz. It has comparatively longer turn-OFF time than SCR and therefore its use is limited to a.c. supply frequencies upto 400 Hz.
It is triggered by positive gate pulses. It is triggered by a positive or negative pulse
It has high (di/dt) and (dv/di) ratings. It has low (di/di) and (dv/di) ratings.
It has more reliability. It has less reliability.

 

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