VO617A-3X017T Isolators

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Introduction

The VO617A-3X017T is a type of opto-isolator classed as a transistor photovoltaic output device. It is a two-terminal device which encloses a light-sensitive semiconductor diode in a ßexible transparent membrane with a phototransistor mounted directly behind it. The device provides low-cost, low-power solutions for applications such as safety interlocks, surge protection, level shifters, fan controllers, high-voltage power-cap sensors, and multichannel digital data communications. The VO617A-3X017T is available in both DIP and SMT packages and meets UL94V-0 requirements.

Application Field

The VO617A-3X017T is primarily designed to facilitate transferring of signals between two circuits with different levels of voltage and electrical noise, notably a low-power navigation system and a higher voltage LED lighting system. It is also widely used in a variety of other applications including high voltage power capacitors, temperature sensors, surge protection, fans and level shifters.

Moreover, they are used in actuator, stepper motors, industrial automation systems, and data acquisition systems. The device is widely used in electrical meter systems, robots and automation, medical systems, and other highly sensitive communications and transducer systems. Additionally, they are used in automotive, computer, and audio systems where electrical isolation or noise immunity is required.

Working Principle

The VO617A-3X017T uses a photovoltaic effect based output system. A photodiode built in the device absorbs visible light, which it then converts into a voltage. This voltage is used to activate a transistor, which can then switch loads on or off accordingly. Since this process occurs without any direct electrical connection between the nodes, the device provides a reliable method of electrical isolation. The light-emitting diode produces a suitable level of visible light required to activate the transistor.

When the LED is not emitting visible light, the photovoltaic cell is inactive and there will be minimal current flow. When the LED is illuminated, the photovoltaic cell produces a voltage which is proportional to the current used to drive the LED. This voltage is then processed by the transistor and used to switch the load.

Conclusion

The VO617A-3X017T is an optoisolator designed for transferring of signals between two circuits with different levels of voltage and electrical noise. It is used in a variety of applications such as safety interlocks, fans and level shifters. The device uses a photovoltaic effect based output system, where a photodiode converts visible light into a voltage, which is used to then activate a transistor. This proves an effective method of electrical isolation.

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