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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 | 400V |
| SCR IE | 15mA |
| SCR VF | 1.6V |
| SCR IG (uA) | 50µA |
| SCR VG (V) | 2V |
| SCR hold In | 50mA |
