PC817 Transistor Output Optocoupler DIP-4

PC817 Transistor Output Optocoupler DIP-4 is a compact optoelectronic device that combines a gallium arsenide infrared LED and a silicon phototransistor in a 4-pin DIP package. It provides electrical isolation between input and output, making it ideal for interfacing low-voltage control circuits with high-voltage or noisy systems. Commonly used in signal isolation, switching power supplies, and microcontroller applications. Alternate name is EL817, 817C, FL817C, PS817C.

Key Features of PC817 Transistor Output Optocoupler DIP-4:

• Phototransistor Output: Allows for easy interfacing with digital logic circuits.
• High Isolation Voltage: Provides 5000V RMS isolation between input and output.
• Compact DIP-4 Package: Suitable for through-hole PCB mounting.
• Low Input Drive Current: Requires minimal input current to operate (typically 10mA).
• Wide Operating Temperature Range: Works reliably between -30°C to +100°C.

Technical Specifications of PC817 Transistor Output Optocoupler DIP-4:

• Input Type: GaAs Infrared LED
• Output Type: NPN Phototransistor
• Isolation Voltage: 5000V RMS
• Collector-Emitter Voltage (V_CEO): 80V
• Emitter-Collector Voltage (V_ECO): 6V
• Collector Current (I_C): 50mA max
• CTR (Current Transfer Ratio): 50% to 600% (depending on model)
• Forward Current (I_F): 50mA max
• Reverse Voltage (V_R): 6V max
• Power Dissipation: 200mW

Mechanical Specifications of PC817 Transistor Output Optocoupler DIP-4:

• Package Type: 4-pin Dual Inline Package (DIP)
• Lead Pitch: 2.54mm
• Body Material: Molded epoxy resin
• Lead Finish: Tin-plated for solderability

Dimensions:

• Body Length: 6.5mm
• Body Width: 4.5mm
• Body Height: 3.5mm
• Pin Spacing: 2.54mm (standard DIP)

Mounting Options:

• Through-Hole Mount: Easily fits in standard PCBs for DIP packages.
• Socket Compatible: Can be used with DIP sockets for replaceability.

Schematic Diagram, Connection, Wiring and Pinout of PC817:

• Pin 1: Anode of LED
• Pin 2: Cathode of LED
• Pin 3: Emitter of phototransistor
• Pin 4: Collector of phototransistor
• Connection: Apply control signal to input side (pins 1 and 2); output signal appears across pins 3 and 4
• Wiring: Use current-limiting resistor on LED side; connect output to logic input with pull-up if needed

Datasheet of PC817 Transistor Output Optocoupler DIP-4:

• Download PC817 Datasheet (PDF)

Applications of PC817 Transistor Output Optocoupler DIP-4:

• Microcontroller Interfacing: Isolates digital signals between MCU and high-voltage circuits.
• Switching Power Supplies: Feedback loop for voltage regulation.
• Signal Isolation: Prevents ground loops and signal distortion.
• Relay Driver Circuits: Provides safe switching between logic level and relay coil.
• SMPS and Inverters: Used in feedback and triggering stages.

Equivalent of PC817 Transistor Output Optocoupler DIP-4:

• EL817: Equivalent performance and pinout
• TLP521: Toshiba alternative with similar ratings
• 4N35: General-purpose optocoupler alternative
• MOC3021: Optoisolator with TRIAC output for AC loads

Package Includes:

• 1 x PC817 Transistor Output Optocoupler DIP-4