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TVS - Varistors, MOVs

The VE07P00131K* application field and working principle are necessary elements of understanding TVS and MOV devices. These are two commonly encountered forms of transient voltage suppression (TVS) devices, and they both function as electronic fuses to protect electronic equipment from surge voltage transients. Understanding their operation and the general environment in which they are usually used helps engineers design and implement more robust electronic systems.

Varistors

A varistor, also known as a voltage-dependent resistor (VDR), is a non-linear, semiconductor device that has a resistance that is dependent on the applied voltage. This means that the resistance decreases when the applied voltage increases. When exposed to a voltage level outside of its normal operating range, the varistor quickly switches from a low electrical resistance state to a high electrical resistance state. In this way, it serves as an electronic fuse, diverting the current when the voltage exceeds the specified threshold. It is critical to ensure that the varistor is sized correctly, such that the voltage is clamped at the correct threshold.

MOVs

A metal-oxide varistor (MOV) is a specialized form of varistor composed of a metal oxide material. It is designed to absorb electrical energy when the voltage on the device exceeds the threshold, typically around 400V to 600V depending on the material and construction. MOVs are used to suppress high-voltage transients that could damage sensitive electronic circuits. Like the varistor, it is important that the MOV is correctly sized to clamp the voltage at the desired threshold.

Application Field of VE07P00131K

The VE07P00131K is a Varistor-MOV hybrid device designed to provide superior voltage and power surge protection with low capacitance and fast response time. It is ideal for use in low voltage, high power electronics such as power supplies, computers and other electrical equipment. Its compact design allows it to be used in applications requiring board-level protection.

The VE07P00131K is rated for a maximum surge current of 3.5 kArms, with a maximum transient voltage of 150V peak. Its effective clamping voltage diameter range is from 4.8V to 145V. It has an ultra-low capacitance of 4.4pF, and a fast response time of under 1ns. This means that it will quickly react to transient voltage events and thereby protect the circuitry it is wired to.

Working Principle of VE07P00131K

When a voltage transient of sufficient magnitude is applied to the VE07P00131K, the varistor element within the device quickly switches from a low resistance state to a high resistance state, and in the process, it absorbs the energy of the transient. The MOV element also works to clamp the voltage, ensuring that the transient voltage on the device does not exceed the rated level.

The VE07P00131K is unique in its combination of varistor and MOV technologies. The hybrid design provides superior protection from both high voltage transients and power surges. Its low capacitance and fast response time make it ideal for a variety of applications.

Conclusion

TVS devices, including Varistors and MOVs are critical components that are used to protect sensitive circuits from transient voltages and power surges. The VE07P00131K is an example of a hybrid device that combines both varistor and MOV technologies to provide superior protection. Its small form factor, ultra-low capacitance, and fast response time make it a particularly effective choice for a variety of applications.

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