VOS628A-3T Isolators

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Optoisolators are used when an electrical/electronic system needs to be electrically isolated from another system, typically either due to safety requirements or for noise immunity. The VOS628A-3T is a key type of optoisolator as it is a transistor, photovoltaic output device that provides a high level of safety isolation between input and output circuits without adding a ground loop.

VOS628A-3T Overview

The VOS628A-3T optoisolator is a unidirectional transistor output that includes an LED, optically coupled to a phototransistor. The device offers a voltage range of 3.9V to 32V. The LED current should not exceed 25mA and direct current input should be less than 20mA in order to protect the phototransistor. The format of the optoisolator is an open-collector with a collector-emitter voltage rated to 30V DC. Isolation voltage of up to 4000V AC is provided between the input and output of the device.

VOS628A-3T Operating Principle

The operating principle of the VOS628A-3T involves the input signal energizing the LED on the input side of the optoisolator and this in turn causes the photo-transistor to conduct on the output side, thereby providing a signal between the input and output. This signal appears as a voltage between the collector and emitter with a maximum current limited by the resistor used to bias the transistor.

When the LED is off, the phototransistor does not conduct and therefore the output voltage is close to 0 volts. As the LED current increases, the LED causes the phototransistor to conduct more and the voltage on the output side increases, up to the voltage limit. The output voltage is typically lower than the input voltage due to the inherent voltage drop of the optoisolator.

VOS628A-3T Application Fields

The VOS628A-3T optoisolator can be used to assist a wide range of applications such as industrial control, test equipment, medical equipment, signal transmission and computer peripherals. The device is commonly found in low current, high voltage and logic level applications as the input can be a logic signal with the output a voltage or current that levels the input signal. In addition, the device’s 4000V AC isolation voltage makes it ideal for applications that require high levels of safety.

The optoisolator can also be used for interface electronic circuits with different power supply voltages. In this application, the input can be connected to either side of the circuit, providing electrical isolation and allowing a signal to be safely passed between the two circuits without any interaction between them. This can be useful for communication between circuits with different ground levels or between different types of systems.

Furthermore, the VOS628A-3T is often used to interface analog circuits with digital circuits as it is capable of taking a varying (analog) input and producing a digital (high/low) output. This is often seen in applications such as touch sensors or electro-mechanical switches, where the varying input can be used to trigger a logic signal which can then be used to control other circuitry.

Conclusion

In conclusion, the VOS628A-3T optoisolator provides high levels of safety isolation and is suitable for a variety of applications such as industrial control, medical equipment, test equipment, signal transmission, interfacing, and computer peripherals. Through its LED and phototransistor, the device is able to take a varying input and produce a digital output, making it an ideal choice for a variety of isolation applications.

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