IC EL817 Opto Coupler PDIP 4
The EL817 optocoupler provides electrical isolation between input and output circuits using an infrared LED and an NPN phototransistor in a compact 4-pin DIP package. It supports isolated signalling between low-voltage electronics and power circuits.
Key Features
Electrical Isolation
Typical isolation rating up to 5000 Vrms, as stated in the product overview.
CTR Options
Available in multiple current-transfer-ratio bins; select the appropriate grade for the circuit.
Low-Power LED Input
Low forward-current operation supports efficient isolated interfaces.
Phototransistor Output
Suitable for interfacing with logic circuits, microcontrollers and analog stages.
4-Pin DIP Package
Compatible with through-hole assembly, breadboards and PCBs.
Typical Applications
- SMPS feedback and primary/secondary control isolation
- Microcontroller and PLC interfacing
- Battery chargers and inverters
- Industrial automation
- Signal isolation and level shifting
- Home appliances, motor drives and consumer electronics
Design Benefits
Optical coupling transfers signals while maintaining electrical separation. Check the datasheet and the supplied CTR grade when designing the input resistor and output circuit.
