The PC817 is a compact optoisolator (photocoupler) that uses an internal infrared LED and phototransistor to transfer signals between two circuits without a physical electrical connection.
Primary Function: Provides high-voltage isolation (up to 5kV) to protect sensitive low-power components (like microcontrollers) from high-voltage noise or power spikes.
Package: Standard 4-pin DIP (Dual In-line Package).
Key Specs: 80V max collector-emitter voltage, 50mA collector current, and a 1.2V typical input forward voltage.
Best For: Switching power supplies, noise suppression, signal isolation, and relay driving.
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