PC817 Transistor Output Optocoupler DIP-4

PC817 Transistor Output Optocoupler DIP-4 is a widely used optoelectronic component that isolates low-voltage control signals from high-voltage circuits. It features an internal infrared LED and a phototransistor, enabling safe signal transfer between different voltage domains. Ideal for microcontroller interfacing, switching power supplies, and signal isolation applications.

Key Features:

• High Isolation Voltage: Up to 5000Vrms between input and output
• Phototransistor Output: Transistor allows easy interfacing with logic circuits
• Low Input Current: Operates with just a few milliamps of LED current
• Compact Package: Standard DIP-4 through-hole package
• Wide Applications: Ideal for isolating digital signals and protecting microcontrollers

Technical Specifications:

• Input LED Forward Voltage: 1.2V typical
• LED Forward Current: 20mA nominal
• Collector-Emitter Voltage: 80V max
• Collector Current: 50mA max
• Isolation Voltage: 5000Vrms (minimum)
• CTR (Current Transfer Ratio): 50% to 600% depending on variant
• Response Time: ~4µs (typical)

Mechanical Specifications:

• Package Type: DIP-4 Through-hole
• Pins: 4 Pins (2 input, 2 output)
• Weight: ~0.4g

Dimensions:

• Body Width: 6.5mm
• Body Height: 4.6mm
• Body Length: 7.0mm
• Pin Pitch: 2.54mm
• Pin Span: 7.62mm (standard DIP)

Pinout and Wiring:

• Pin 1: Anode (LED Input +)
• Pin 2: Cathode (LED Input -)
• Pin 3: Emitter (Phototransistor Output -)
• Pin 4: Collector (Phototransistor Output +)
• Connection Example: Connect Pin 1 to logic output via resistor, and use Pins 3/4 to drive transistor or logic input

Datasheet Reference:

• Search for “PC817 optocoupler datasheet Sharp or Everlight version” for full specs and curve diagrams

Applications:

• Microcontroller Isolation: Protect MCU inputs from high-voltage spikes
• Switching Power Supplies: Feedback path between high- and low-voltage sides
• Industrial Controls: Reliable signal isolation in noisy environments
• Signal Level Shifting: Interface between different voltage logic levels
• Home Appliances: Used in inverter control and smart systems

Equivalent Models:

• EL817: Everlight-compatible optocoupler with similar specs
• 4N35: General-purpose optoisolator with DIP-6 package
• H11AA1: Dual LED optocoupler with AC input compatibility
• TLP521: Toshiba alternative with comparable performance

Package Includes:

• 1 x PC817 Transistor Output Optocoupler DIP-4