The TRIAC is a three terminal semiconductor device for controlling current. It gains it's name from the term TRIode for Alternating Current.
It is effectivly a development of the SCR or thyristor, but unlike the thyristor which is only able to conduct in one direction, the TRIAC is a bidirectional device.
Type: SC151D
Is it an SCR or a triac:Triac
SCR voltage max:400.0 V
SCR IE:15.0 mA
SCR VF:1.6 V
SCR IG (uA):50.0 µA
SCR VG (V):2.0 V
SCR hold In:50.0 mA
SC151D 400V 15A TRIAC
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