The difference of SCR (silicon controlled rectifier) and DIAC (diode alternating current) are given below,
|The SCR stands for silicon controlled rectifier.
||The DIAC stands for diode alternating current.
|The SCR is a four layers PNPN device with three terminals namely anode, cathode and gate.
||The DIAC basically a two terminal device. It is a parallel inverse combination of semiconductor layers that permits triggering in either direction.
|It is a high power device.
||It is low power device..
|It is a three terminal device.
||It is a two terminal device.
|The break over voltage can be controlled by adjusting the gate current.
||The break over voltage cannot be controlled.
|The symbol is
||The symbol is
|The breakdown voltage is ± 26 V. The maximum anode current is 25 mA.
||The forward break over voltage is 40 V. The maximum anode current is 100 A.
|It is used in applications like dimmer, control light, fan etc
||It is used as a triggering device for the TRIAC.