H11A5S(TB)-V

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Optoisolators are an important family of components used in many industries due to their ability to transfer electrical signals across two electrically isolated circuits. The H11A5S(TB)-V is a specialized type of optoisolator which uses a photo-transistor output to provide high voltage isolation. This article will explain the application field and working principle of the H11A5S(TB)-V.

Application Field

The H11A5S(TB)-V optoisolator has been designed for use in applications that require a level of isolation and noise immunity greater than what is typically offered by solid-state ICs. In particular, it is suitable for applications where noise from an output circuit needs to be controlled, as it provides an isolation barrier between the control circuit and the output circuit. Other suitable application areas include LED lighting, digital communications, power management, industrial automation and medical device designs.

Working Principle

The H11A5S(TB)-V optoisolator consists of two components; an LED and a phototransistor. The LED is the input device which is connected to the control circuitry. The control signal is capable of driving currents through the LED which causes it to emit a light pulse, otherwise known as photo-optic energy. The phototransistor is the output device which is connected to the output circuitry. The emitted light pulse is detected by the phototransistor which then controls a transistor that is part of the output circuit. By extracting the designated current from the output transistor the optoisolator provides a measure of electrical isolation between the control circuit and the output circuit.

Conclusion

The H11A5S(TB)-V optoisolator is a specialised optoisolator device that provides a significant level of isolation and noise immunity in applications where traditional solid-state ICs may not be suitable. It consists of two components; an LED for the input, and a phototransistor for the output. When a control signal is applied, photo-optic energy is emitted from the LED that is detected by the phototransistor resulting in a controlled activation of an output transistor.

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