LTV-357T Isolators

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Optoisolators - Transistor, Photovoltaic Output include a variety of devices that use a light-emitting diode (LED) and a phototransistor as the two primary elements. The LTV-357T is a 4-channel, Phototransistor Output, Voltage-Transition Optoisolation device from Lite-On Technology Corporation. This device combines outstanding performance and excellent reliability, making it suitable for use in critical applications such as Isolated Analog Signal Transmitters, high voltage circuit protective devices, and interrupt circuits.

Overview of LTV-357T

The LTV-357T is a voltage-transition optoisolator, which means that it requires an external voltage source to activate the optoisolation device. This device has four channels, each of which are isolated and have independent input/output circuitry. The isolated input voltage is applied to the LED side while the output voltage is taken from the transistor side. The LED side voltage must be compatible with the output voltage in order for the optoisolator to work properly. The LED side voltage can be adjusted up to the supply voltage (VM) connected to the optoisolator. The device has a maximum power rating of 1 W and an isolation voltage of 2.5 kV.

Working Principle of LTV-357T

The LTV-357T works according to the phototransistor principle. When voltage is applied to the input side, it activates the LED which emits light. The light acts as a trigger and activates the phototransistor, causing current to flow through the output. The current is related to the amount of light the phototransistor detects, and the intensity of the light is related to the amount of voltage applied to the input. The output voltage is then equal to the difference between the voltage applied to the input of the optoisolator and the voltage generated by the phototransistor.

Application of LTV-357T

The LTV-357T is suitable for applications such as isolated analog signal transmitters, high voltage circuit protective devices, and interrupt circuits. It can also be used for:

• High voltage protection in consumer electronics products including LED lighting, electric appliances, and digital products.
• Automated test and measurement systems.
• Data communication systems, such as industrial Ethernet.
• Industrial automation applications, such as programmable logic controllers (PLCs).
• Isolated power supply for analog and digital circuits.
• Switching and control systems, such as motor starters and contactors.
• Safety circuits and emergency shutdown systems.

Advantages of LTV-357T

The LTV-357T has a number of advantages over other optoisolators. Some of these advantages include:

• Excellent electrical performance, with a maximum leakage current of 0.2 μA.
• Low hysteresis thanks to its precise voltage-transition output.
• High insulation voltage (2.5 kV).
• A wide operating temperature range (-40 °C to +85 °C).
• Compatibility with a wide range of power sources, including AC and DC.

The LTV-357T is a reliable and versatile optoisolator, making it an ideal choice for a variety of applications.

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