PC817 Photocoupler 80V 50mA IC DIP-4
PC817 A widely-used 4-pin DIP photocoupler/optoisolator for signal isolation and noise suppression in electronic circuits.
1.75 EGP
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The PC817 is a general-purpose optocoupler that contains an infrared LED optically coupled to a phototransistor in a 4-pin package. It provides galvanic isolation between input and output, allowing digital or analog signals to be transferred while protecting low-voltage logic from high voltages, ground loops, or electrical noise. The family includes through-hole DIP, wide-lead, and SMT gullwing lead-forms and offers several CTR ranks so designers can select parts for different gain/drive conditions.
Because the device uses a transistor output stage it is ideal for I/O isolation, noise suppression in switching circuits, and signal level translation between different potentials or impedances. The PC817 is UL-recognized for isolation (UL1577) and specified with high input-to-output isolation (5.0kVrms), moderate speed (µs-range response), and broad temperature/storage ratings—making it suitable for general industrial, consumer, and communications equipment.
Features:
- Optically coupled LED → phototransistor design.
- 4-pin package (DIP and SMT options).
- Multiple CTR (current transfer ratio) ranks available.
- High input-to-output isolation (UL recognized).
- Low-profile packages and wide-lead options for through-hole and SMT assembly.
Specifications:
| Specification | Value |
|---|---|
| Forward Voltage (VF): | 1.2V, Max. 1.4V |
| Reverse Voltage (VR): | Max. 6V |
| Forward Current (IF): | Max. 50mA |
| Peak Forward Current (IFM): | 1A (pulse) |
| Collector-Emitter Voltage (VCEO): | 80V |
| Emitter-Collector Voltage (VECO): | 6V |
| Collector Current (IC): | Max. 50mA |
| Collector Power Dissipation: | 150mW |
| Total Power Dissipation: | 200mW |
| Isolation Voltage (Input–Output); | 5.0kVrms |
| Cut-off Frequency: | 80kHz |
| Rise Time: | 4µs |
| Fall Time: | 3µs |
| Operating Temperature Range: | −30°C to +100°C |
| Storage Temperature Range: | −55°C to +125°C |
| Soldering Temperature (Peak): | 260°C (leads), 250°C (package surface) |
Pinout:
| Pin Number | Function |
|---|---|
| Pin 1 | Anode (Infrared LED) |
| Pin 2 | Cathode (Infrared LED) |
| Pin 3 | Emitter (Phototransistor) |
| Pin 4 | Collector (Phototransistor) |
Footprint:
Applications:
- I/O isolation for microcontrollers and logic interfaces.
- Noise suppression/isolation in switching power circuits.
- Signal transmission between circuits at different potentials or impedances.
- Line receiver isolation, relay drive isolation, and general industrial control interfaces.
Packages:
- 1x PC817 Photocoupler 80V 50mA IC DIP-4.