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PC817 Optocoupler
10.00৳ 20.00৳ (-50%)
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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PC817 Optocoupler
The PC817 is a widely used optoisolator (or optocoupler) that uses light to transfer electrical signals between two completely isolated circuits. It consists of an internal infrared emitting diode (IRED) on the input side and a phototransistor on the output side.
PC817 Optocoupler
Key Features
- Electrical Isolation: Provides high galvanic isolation of up to 5,000Vrms, protecting low-voltage controllers (like microcontrollers) from high-voltage spikes or noise.
- Signal Integrity: Effectively suppresses electrical noise, making it ideal for clear signal transmission in complex environments.
- Versatile Design: Available in a compact 4-pin Dual In-line Package (DIP-4) or Surface Mount Device (SMT) package.
- Protection: Features built-in internal reverse current protection for the infrared LED.
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Technical Specifications
Parameter Value Max Collector-Emitter Voltage ( )
80V Input Diode Forward Voltage ( )
Typically 1.2V to 1.25V Max Collector Current ( )
50mA Current Transfer Ratio (CTR) 50% to 600% (varies by grade) Response Time (Rise/Fall) 18 microseconds ( s)
Cut-off Frequency 80kHz Operating Temperature -30°C to +100°C -
Pin ConfigurationThe device has four pins, starting from the notch or dot and going counter-clockwise:
- Anode (+): Positive terminal for the internal IR LED.
- Cathode (-): Negative terminal for the internal IR LED.
- Emitter: Ground for the output phototransistor.
- Collector: Output of the phototransistor, typically pulled high with a resistor.
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Common Applications- Microcontroller I/O Isolation: Protects sensitive digital pins from high-voltage external components like motors or relays.
- Power Supply Regulation: Used in switching power supplies for safe feedback and control.
- Communication Systems: Separates transmission lines from receiving circuits to prevent interference.
- Home Appliances: Controls AC loads such as fan heaters or dimmers using low-voltage digital signals.
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Would you like a basic wiring diagram for connecting this to a microcontroller or info on its equivalents (like the 4N25)?
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