VO4258H

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optoisolators isolate input voltage from output voltage - typically a low-voltage dc signal from an ac voltage - with the aim of preventing electric shock and controlling the risk of sparking and hazardous ground loops in electric circuits. VO4258H optoisolators are triac, SCR output types designed to control alternating current flow on the output side.

The VO4258H is designed for a wide variety of applications such as lighting and washing machine controls. It is a compact and robust package, offering an optimal balance between cost and performance. It features a built-in LED, which acts as an energy source for the optoisolator, while; the output side consists of a thyristor with a maximum surge current of 4A.

The working principle of the VO4258H optoisolator is quite simple. When the LED is energized, it emits light which is picked up by the sensitive NPN phototransistor. This creates a voltage at the base of the optoisolator, which is then transferred to the gate of the thyristor. The thyristor starts conducting as soon as the gate voltage reaches a predetermined level. The photoelectric effect also ensures that the input voltage is completely isolated from the output voltage, preventing any potential electric shock.

The VO4258H optoisolator is designed to handle a wide range of input voltages from 12Vac to 300Vac. It has a maximum on-state output voltage of 400V, a maximum gate trigger current of 1mA, and an output current range from 0.2A to 4A. The maximum leak current of the thyristor is 3mA, and the maximum surge current rating is 4A.

The VO4258H optoisolator is a highly efficient device which provides reliable and consistent performance, making it ideal for a variety of applications. Its low power consumption and compact design make it highly suitable for cost-sensitive applications. It also provides excellent protection against electrostatic discharge, making it ideal for medical and industrial environments.

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