MOC5008M

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Optoisolators provide electrical isolation between the input and output sides of the optoisolator, allowing a voltage and/or current imbalance of up to 3,000 V to exist between the two sides. Optoisolators with logic output are particularly useful, as they can be used to monitor the output of a logic circuit (like an RS232 port). One of the most popular of these is the MOC5008M optoisolator.

MOC5008M Application Fields

The MOC5008M optoisolator can be used to connect two logic circuits for task such as:

• Monitoring an RS-232 port
• Monitoring a logic circuit for a low voltage system
• Decoupling the output from a noisy logic circuit
• Providing a logic latch for a control system
• Providing isolation between a logic circuit and an analog circuit

MOC5008M Working Principle

At the heart of the MOC5008M optoisolator is a gallium arsenide infrared LED, which lights up when a voltage is applied to the input side of the device. This light activates a silicon phototransistor on the other side of the device, which acts like a switch, closing when the LED is lit and opening when the LED is off.

The output side of the device is connected so that it is either HIGH or LOW depending on the state of the phototransistor. When the phototransistor is activated, current will flow through the transistor to the output pin making it HIGH. When the LED is off, it removes the current path from the pin, thus making the output LOW.

The LED on the input side of the device is driven by an external voltage source. This voltage source can be from another logic circuit, or it can be from an external power source. When the voltage to the input is high enough, the LED is lit, allowing the phototransistor to activate and keeping the output HIGH.

The MOC5008M optoisolator can handle input voltages up to 35V. This is especially useful in high voltage applications where it can provide isolation between logic circuits with voltages of up to 3,000V between them.

Conclusion

The MOC5008M optoisolator is an excellent choice for a logic output optoisolator as it is well suited to a variety of applications such as RS232 monitoring, logic latch operation, and providing isolation in high voltage systems. The MOC5008M is reliable, affordable, and has enough voltage and current handling capabilities to make it a great choice for any optoisolator project.

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