The EL817 Optocoupler Phototransistor IC Dip-4 is a widely-used 4-pin optocoupler featuring a gallium arsenide infrared LED that optically controls a phototransistor. It provides reliable electrical isolation between low-voltage logic and high-voltage circuits, making it ideal for signal switching, microcontroller interfacing, and isolation in power electronics.
Specifications:
| Parameter | Value |
|---|---|
| Series | EL817 |
| Case/Package | SMD-4 |
| Mounting Type | SMD/SMT |
| Max. Collector Current | 50mA |
| Power Dissipation (mW) | 200 |
| Operating Temperature (°C) | -30°C to 100°C |
| Forword Voltage and Reverse Voltage | 1.2 V and 6V |
Features:
- High isolation voltage up to 5000 Vrms
- Reliable signal transmission and noise immunity
- Compact DIP-4 through-hole package
- Compatible with standard TTL and CMOS logic
- Suitable for both analog and digital circuits
Package Includes:
- 1 x EL817 Optocoupler Phototransistor IC DIP-4


















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