EL817C Optocoupler – SOP-4

The EL817C Optocoupler contains a infrared emitting diode optically coupled to a phototransistor. It is packaged in a 4-pin SMD. An optocoupler is a device which operates due to light, its design is such that, it has LED on input side, and photo driver on output side. Now, when the current flows on the input side, the LED glows, and puts light on the photo transistor, which turns on and drives the output.

It has an isolation of 5000V between input and output. It also has high collector emitter voltage of 35V. The Current Transfer Ratio of EL817C is: 200% to 400%.