PC817 Optocoupler Photoresistor Optoisolator IC
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The PC817 is a highly reliable, 4-pin DIP-packaged optocoupler (optoisolator) designed to provide safe optical signal isolation between high-voltage and low-voltage circuits. Featuring an infrared emitting diode optically coupled to a phototransistor, it delivers an isolation voltage rating up to 5kV, protecting sensitive microcontrollers and control logic from electrical surges and noise interference. With its compact footprint and stable current transfer ratio (CTR), this component is a staple for feedback loops in switched-mode power supplies (SMPS), logic ground isolation, and microcontroller system interfaces.
PC817 Phototransistor Optocoupler Optoisolator IC (DIP-4)
Product Overview
The PC817 is an industry-standard, 4-pin dual in-line (DIP-4) phototransistor optocoupler (optoisolator) engineered to provide complete electrical isolation between two circuits. By transmitting signals using light rather than an electrical connection, it creates a safe barrier that shields sensitive, low-voltage control units (like microcontrollers) from high-voltage spikes, noise, and ground loops. It houses an infrared light-emitting diode (LED) optically coupled to a high-voltage phototransistor detector within a rugged, compact plastic package.
Key Features
- High-Voltage Optical Isolation: Provides a high electrical isolation voltage rating (up to 5,000Vrms) to safely segregate dangerous mains power tracks from sensitive logic components.
- Stable Current Transfer Ratio (CTR): Delivers linear signal coupling performance over a wide range of input currents, making it excellent for precision feedback control loops.
- Fast Response Time: Features swift switching rise and fall times, allowing the IC to cleanly transmit high-frequency digital pulses and data triggers.
- Compact DIP-4 Package: The standard 4-pin layout easily drops into breadboards, universal prototyping PCBs, or production surface-mount footprints.
- Unidirectional Protection: Completely blocks electrical feedback loops and noise surges from traversing backward into your main processing chips.
Technical Specifications
| Parameter | Specification Rating |
|---|---|
| Package Type | DIP-4 (Through-Hole Dual In-line) |
| Isolation Voltage | 5,000 Vrms Maximum |
| Collector-Emitter Voltage ($V_{CEO}$) | 80V Max |
| Emitter-Collector Voltage ($V_{ECO}$) | 6V Max |
| Forward LED Current ($I_F$) | 50mA Max |
| Collector Current ($I_C$) | 50mA Max |
| Power Dissipation | 200mW |
| Operating Temperature | -30°C to +100°C Range |
Internal Pin Configuration
Looking at the chip from the top with the pin 1 indicator dot/notch on the left:
- Pin 1: Anode (Positive lead of the internal Infrared LED input)
- Pin 2: Cathode (Negative lead of the internal Infrared LED input)
- Pin 3: Emitter (Output terminal of the internal Phototransistor)
- Pin 4: Collector (Input terminal of the internal Phototransistor)
Ideal Applications
- Feedback loop isolation in Switched-Mode Power Supplies (SMPS) and battery chargers.
- Microcontroller (MCU) I/O pin isolation for driving heavy relays, motors, and high-voltage solenoids.
- Eliminating ground loop noise in computer peripherals, industrial automation gear, and system interfaces.
- Telecommunication switching equipment and digital logic circuit interface decoupling.
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