MOC is a non-zero crossing based optoisolator consists of gallium arsenide infrared emitting diodes, optically coupled to a silicon-based triac. Optocoupler has multiple types and every type has almost the same operating functionality, but sometimes its internal structure makes it different from another optocoupler. This optocoupler provides protection from HIGH resistive and inductive loads. It has the ability to flow the current up to 1A. MOC Optocoupler work on the IR based and it keeps any kind of current to flow towards the circuit. The optocoupler comes only in one package but the single package could be used with any circuit.

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Since the output is driven by a TRIAC we can drive loads upto V and the triac can conduct in both directions hence controlling AC loads will not be a problem. It also has a decent rise and fall time and hence can be used to control the output voltage. Since the output is controlled we can control the intensity of the light or the speed of a AC motor. So if you are looking for a opto-isolator to control a AC application through DC then this IC might be the right choice for you.

They are normally connected to another power switch like a Triac in our case, this TRIAC will be able to provide enough current to drive the loads and will be controlled using the opto-coupler. A simple circuit diagram in which an AC bulb is controlled using a microcontroller is shown below. When trying to switch AC loads it is important to understand the switching speed of the Opto-coupler.

This switching speed depends in the amplitude of voltage that is being controlled by the TRIAC and the operating ambient temperature. The graph below will give you a good understanding of the time take. For example at 30 degree Celsius of ambient temperature the rate of change of voltage with respect to time will be 9V per unit time, where unit time is uS. So we can change 9V in one micro second. Subscribe to stay updated with industry's latest Electronics components and news.

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