Output of Microcontrollers to control devices Isolation between any type of two circuits If you require more isolation tasks at the same time then you can also use other optocouplers that contains couple of IR LEDS and phototransistors in a single package.

PC817 is a widely used optcoupler and works well in electronic circuit for a single isolation task. Its working is simple, when a used apply voltage to the IR LED which is connected on pin 1 and 2 the LED become activated and the light is received by the internal phototransistor hence making it in saturation state due to which it connects the pin 3 and 4 with each other. PC817 is a commonly used Optocoupler, it contains one IR LED and one photo transistor in its package. Optocouplers also called photocouplers & opto isolators, they are IC type looking components available from 4 pins to many numbers of pins, they are mostly used for isolating of two circuits from each other. PC817 Optocoupler Explained / Description Max Storage & Operating temperature Should Be: -55 to +120 Centigrade for storage & -30 to +100 for operating.Max Collector Dissipation (Pc): 200 miliWatt.Max Emitter-Collector Voltage (VEBO): 6V.Collector-Emitter Saturation Voltage: 0.1 to 0.2.Max Collector-Emitter Voltage (VCEO): 80V.

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Optical isolator 4n25