Difference between SCR and TRIAC

Following are main difference between SCR (Silicon controlled rectifier)and TRIAC (Triode for alternating current) :

SCR TRIAC
SCR stands for silicon controlled rectifier. TRIAC stands for triode for alternating current.
The SCR is unidirectional device. The TRIAC is bidirectional device.
It available in large ratings. It available in smaller ratings.
The SCR control DC power. The TRIAC control DC as well as AC power.
The SCR can be triggered by positive gate voltage only. The TRIAC can be triggered either by positive or negative gate voltage.
In SCR only one mode of operation is possible. In TRIAC  four different modes of operation is possible.
It is more reliable. It is less reliable.
The SCR conduct  current in one direction only. The TRIAC conduct  current in both the directions.
It needs two heat sink. It needs only one heat sink.
SCR Vs TRIAC

SCR Vs TRIAC

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