The bi-directional thyristor (TRIAC) is composed of NNPPN five-layer semiconductor material with three electrodes (main electrode T1, main electrode T2 and gate G), which is equivalent to two anti-parallel common unidirectional thyristors (SCR).
Compared with unidirectional thyristors, the main differences between SCR and are:
After triggered, TRAIC can be conducted bi-directionally.
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