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DescriptionProtect your sensitive digital logic from noisy, high-voltage environments with the PC817 Optocoupler IC. Whether you are prototyping an industrial control system, designing a custom relay module, or interfacing an ESP32 with a 12V automotive circuit, the PC817 is your ultimate insurance policy. It allows your microcontroller to control or read from a high-power circuit while keeping the two systems completely electrically isolated.How It WorksInside the tiny 4-pin package are two separate components: an infrared (IR) LED and a phototransistor.When you apply a small voltage to the input pins (Pins 1 and 2), the internal LED turns on. The light travels across a microscopic physical gap and hits the base of the internal phototransistor (Pins 3 and 4), causing it to conduct electricity. Because the signal is transmitted entirely via light, there is zero direct electrical contact between your input and output.This optical barrier can withstand voltage differences of up to 5000 Volts, completely blocking destructive back-EMF, static shock, and electrical noise from reaching your microcontroller.Key Features:True Electrical Isolation: Protects low-voltage logic (3.3V/5V) from high-voltage spikes and eliminates pesky ground loops.Simple 4-Pin Design: Incredibly easy to wire up on a breadboard or custom PCB.Versatile Interfacing: Perfect for stepping up a 3.3V signal to 12V/24V, or safely reading a 12V/24V sensor input on a 3.3V microcontroller.High Noise Immunity: Cleans up signals in environments with heavy electrical interference (like near large motors or AC lines).Technical Specifications:Output Type: PhototransistorIsolation Voltage: 5000V rmsForward Current ($I_F$): 50mA (Max input to the LED)Collector-Emitter Voltage ($V_{CEO}$): 35V to 50V (Max voltage the output can handle)Collector Current ($I_C$): 50mACurrent Transfer Ratio (CTR): 50% to 600% (at $I_F$ = 5mA, $V_{CE}$ = 5V)Package Type: 4-Pin DIPIdeal Applications:Driving mechanical relays and heavy-duty contactorsSwitch-mode power supply (SMPS) voltage feedbackIsolating sensitive Arduino/ESP32 sensor inputs from noisy industrial machineryInterfacing different voltage levels (e.g., 3.3V logic to 12V PLC inputs)Eliminating audio or signal ground loopsDocuments:Datasheet