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: BT137X
Note: ZX-7149 is isotab - mounting tab is not connected to pins.
Is it an SCR or a triac:Triac
SCR voltage max:600.0 V
SCR IE:8.0 A
SCR VF:1.65 V
SCR IG (uA):25.0 µA
SCR VG (V):1.5 V
SCR hold In:20.0 mA
BT137X 600V 8A TRIAC
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