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American Microsemiconductor, Inc.

The Triac is a three terminal semiconductor for controlling current in either direction. A triac operates in the same way as the SCR however a triac operates in both a forward and reverse direction. A triac can be triggerred into conduction by either positive or negative gate signal.(consistant with polarity of the Anode to Cathode circuit)

Obviously a triac can also be triggered...

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