![]() The external switches are connected to Pin 4 and 6.ĤN25, 6N135, PC817, MOC3041, 6N137 How and Where to use MOC3021 Phototransistor Optocoupler Pin 6 is the second TRIAC pin in the optocoupler. ![]() Pin 5 also doesn’t have any use instead of balancing the IC. Pin 5 is also a second no connection pin of the IC just like Pin 3. Sometimes NC pins are designed for physical support and sometimes they are available in the devices just because of its complex internal design. NC pin is used just for soldering the optocoupler to the board for proper support. To use the IR pin 2 should be common ground with the power supply or the logical input device. Pin 2 is the cathode pin of the optocoupler is the ground pin of the IR within the optocoupler. Pin 1 is actually the internal IR transmitter pin of the optocoupler. In case of HIGH pulse on the MOC3021 makes it functional which then could be used further. It is used to control the output of the MOC3021. This ability of optocoupler not only allow the device to control the output as a switch, but it also allows the device to be controlled at different levels, that is the reason in IOT the optocoupler MOC3021 used in a circuit to control the Motor speed, Heater temperature, etc. The other optocoupler only gives the output only gives magnitude at zero but non-zero optocoupler gives the magnitude at different levels from zero to maximum. The MOC3021 is a Non-Zero Crossing optocoupler. In HIGH load the operating temperature always affects the circuit performance, but MOC3021 has the ability to operate in HIGH temperature and it also increases the optocoupler life. The optocoupler comes only in one package but the single package could be used with any circuit. MOC3021 Optocoupler work on the IR based and it keeps any kind of current to flow towards the circuit. It has the ability to flow the current up to 1A. This optocoupler provides protection from HIGH resistive and inductive loads. The MOC3021 comes in an internal light-emitting diode and a TRIAC based light activating based transistor. It is having internal TRIAC installed which gives it a capability to control any external switching devices like HIGH POWER TRIAC, MOSFETS, and Solid States Relay. There is also a TRIAC based optocoupler known as MOC3021. Optocoupler has multiple types and every type has almost the same operating functionality, but sometimes its internal structure makes it different from another optocoupler. MOC3021 is a non-zero crossing based optoisolator consists of gallium arsenide infrared emitting diodes, optically coupled to a silicon-based triac.
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