Triac Output Photocouplers: Used for AC load switching. Contains a phototriac driver and a triac in one package. Commonly used in motor control, lighting, and AC power control.

SCR Output Photocouplers: Used for DC or controlled AC switching. Contains a photodiode and SCR. Typically used in high-current applications and industrial control systems.

Key Difference: Triacs control AC bidirectionally, SCRs control unidirectionally (DC or half-wave AC).

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