The BPC-817MC with Optocouplers Through Hole RoHS manufactured by Bright LED is an electronic component that is used to provide electrical isolation between two circuits. It is used to protect sensitive electronic components from overcurrent, overvoltage, and short-circuit conditions. The optocoupler consists of an LED (light emitting diode) and a photodetector (a photocell). When the LED is energized, its light is coupled to the photodetector. This, in turn, produces a proportional current in the photodetector. This current is used to activate other electronic parts. The BPC-817MC is RoHS compliant, making it a suitable option for complying with industry and government regulations.