MOC3020FR2M

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Optoisolators are devices that can electrically isolate two circuits, generally of different electrical potentials. They isolate the circuit from each other by taking the output of one circuit and converting it into an optical signal, transmitting it through a material such as a plastic or metal to the input of the other, which then converts it back into a usable electrical signal. The MOC3020FR2M is one example of an optoisolator, featuring a Triac, SCR Output.

MOC3020FR2M is featured in a 6-pin SOIC package, and includes a transient protection diode, for a low output current of 10mA as well as an acceleration diode for snubberless driving. It utilizes a zero voltage crossing (ZVC) drive technique which offers high immunity to transients and provide extreme noise immunity without the need of an additional snubber across the Triac. This feature is beneficial due to the fact that the MOC3020FR2M turn-on voltage is lower than the normal Triac or thyristor turn-on voltage which reduces power dissipation and increases reliability.

The most common applications for the MOC3020FR2M include Lamp Control, Motor Control, Domestic Appliance and Industrial/Commercial Control applications where isolation between the control circuitry and load is desired. It works by utilizing an industry standard 6-pin dual-in-line package, with the following circuits: an SCR output, phototriac diode, a diac, an acceleration diode, and a control LED.

When the control input voltage is set to the predetermined trigger point, the LED in the device turns on and the phototriac diode is activated, allowing the current to flow between the cathode and anode terminal. This current is then amplified through the diac, further increasing the current flow. The acceleration diode is then used to rapidly increase the current, greatly speeding up the start-up time and allowing it to be used in pulse applications. The current finally passes through the SCR output, allowing it to activate and deactivate devices such as relays, motors, heaters, valves, etc.

The MOC3020FR2M is well known for its functional ability and robustness for a wide variety of control applications that require isolation between the control input circuitry and the load. It provides reliable operation and excellent noise suppression even when subjected to transients thanks to its ZVC drive technique. Combined with its low turn-on voltage and its low power dissipation, the MOC3020FR2M is one of the more popular optoisolators featuring a Triac, SCR Output currently on the market.

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