V420LA20A

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TVS (Transient Voltage Suppressors) is an important device in the electronics industry. TVS devices, such as varistors, MOVs, and others, protect circuits from over-voltage events such as lightning strikes, voltage induced noises and transient surges. One type of TVS device is the V420LA20A Varistor, which is used for a range of applications. In this article we will discuss the V420LA20A Varistor application field and the working principle.

The V420LA20A varistor is an AC and DC voltage sensitive metal oxide resistor which is used to protect circuit equipment from over-voltage events. The V420LA20A varistor is mainly used for over-voltage protection in switching power supplies, AC motor cable protection and other fields where stiff peak transient voltages are expected. The V420LA20A is designed for across-the-line application with both AC and DC voltage. The varistor has an adjustable Clamping Voltage and a temperature coefficient that ensures its performance. The V420LA20A varistor is offered with two product families, which are low power and high power. The low power V420LA20A varistor is used for applications requiring up to 20 Watts of power handling capability, while the high power V420LA20A is used for applications rated up to 40 Watts.

The working principle of the V420LA20A varistor is based on a zinc oxide layer that is sandwiched between two electrodes. The zinc oxide layer is made with nanometer-thick strands of zinc oxide which increases its surface area and improves its electrical and dielectric properties. When exposed to a voltage, the electrons within the zinc oxide layer move and create a current flow, which generates a magnetic field. The magnetic field generated increases proportionally with the voltage, allowing the varistor to react faster to sudden voltage changes. When the voltage exceeds the pre-set threshold level, the device quickly responds by clamping the voltage to the varistor’s breakdown voltage.

The V420LA20A varistor is a reliable and economical device for protecting circuits from overvoltage events. The device offers adjustable clamping voltage and temperature coefficient, making it suitable for applications in switching power supplies, AC motor cable protection and more. The V420LA20A varistor is offered in both low power and high power versions depending on the power handling capability required. Its working principle is based on a zinc oxide layer which provides excellent electrical and dielectric properties while responding quickly to sudden voltage spikes.

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