![]() ![]() High VCEO (collector-emitter voltage): 80V MAXĬTR (Current transfer ratio) are available for several ranks From an electrical standpoint, complete isolation is achieved. Consider an optocoupler to be a type of transistor, except that it sends light and a phototransistor from another circuit picks up the signal and opens or closes the circuit. Optocouplers allow you to send a signal to a circuit that is completely isolated from the electronic world. Pin-4: The Collector pin transfers the logical output when receiving IR signal.Pin-3: The Emitter pin is similar to the Cathode pin.Pin-2: The Cathode (-) pin is connected to the common ground with the circuit and power supply.Pin-1: The Anode (+) pin inputs the logic signal to the internal IR.Simple but useful, the PC817 is trustworthy in low voltage DC devices and MCUs in transferring the signal from one part of the circuit to the other. These two parts are not hard-electrically connected thus, it provides convenient optical noise isolation compared with using resistors and capacitors. It functions as the inner phototransistor conducts when receiving the IR LED's emitting light. ![]() The PC817X series optocoupler IC is comprised of an IRED (Infrared Emitting Diode, or IR LED) and a phototransistor optically coupled to it. ![]()
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