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Optoisolators - Transistor, Photovoltaic Output

Optoisolators are components that are used to transfer electrical signals between two isolated circuits. These include transistor- or photovoltaic-based optoisolators. JAN4N22 applications and working principles will be discussed in this article.

JAN4N22 Applications

Optoisolators find place in applications wherever an isolation between two circuits is desired for protection. They are widely used in telecommunications, data acquisition systems, factory automation, medical systems and instrumentation to name some. The JAN4N22 is a type of transistor-based optoisolator with high sensitivity, good linearity and long life. This product is suitable for analog and digital signal transmissions.

The JAN4N22 provides 1500V rms isolation voltage that withstands a transverse voltage of up to 2250V. It is also highly reliable and operates between a temperature range of -40˚C to +125˚C. This optoisolator is available in a dual-in-line package and 6-pin mini-flat package. It consists of an infrared diode light emitting device as well as a phototransistor for the output.

JAN4N22 Working Principle

The working principle of the JAN4N22 optoisolator is based on the photo conductivity principle of semiconductors. An electrical signal is applied to the input side of the optoisolator, causing the infrared LED to emit light. Photons from this light are received by the output side which has a phototransistor. The phototransistor converts the light energy into electrical energy and generates an output signal.

This output signal can then be used to further drive another circuit, or perform other operations based on the requirements. This way, the JAN4N22 optoisolator provides galvanic isolation between the input and output, since the terminals are not electrically connected. This significantly reduces the chances of electric shock due to high voltages and current.

Conclusion

JAN4N22 is a type of high-reliability and robust optoisolator suitable for a wide variety of applications. It features high input-output isolation and can be used to operate at extreme temperatures. The optoisolator works using the photo conductivity principle of semiconductors, and contains an LED and a phototransistor at its input and output, respectively. JAN4N22 thus provides a safe and effective way to transfer signals between separate circuits.

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