VDRS07H250BSE

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TVS - Varistors, MOVs are such electrical components that provide protection from overloads, such as electric surges, as they effectively reduce the magnitude of a given voltage. Varistors are commonly used in applications that require voltage clamping. In this article, we’ll focus on a popular type of Varistor, namely the VDRS07H250BSE, and its application field & working principle.

Application Field

VDRS07H250BSE can be used in AC/DC circuits where it’s necessary to suppress high voltage peaks generated by EFT surges. It’s also useful in circuits such as solar screens, IGBT-mosfet gates and power conversion systems. Additionally, the device can be used for overcurrent detection, ground fault safety, and signals and integrity monitoring for rail and automotive systems.

Working Principle

The VDRS07H250BSE is made of ceramic multi-layer material, with zinc oxide as the core and silver electrodes functioning as an electrostatic shield. It’s this electrostatic shield, along with the ceramic material, which gives the device its high energy absorption capability. The VDRS07H250BSE’s tolerance towards EMI, ESD, and pure DC operation is high, making it suitable for a wide range of applications.

The device works by a phenomenon called “avalanche”. When a certain electric field is applied to the surface of the zinc oxide core, a large number of electrons are broken and triggered, producing more electrons. This creates a rapid avalanche effect around the electrode, and by raising the voltage around the semiconductor junction, it dissipates the surge energy that was crossing through the core, thereby leading to a clamping action.

This clamping action is accompanied by a low V bidirectional clamping impedance. In other words, the device is able to suppress voltage peaks in both directions while tolerating current up to 25A. Furthermore, the VDRS07H250BSE has an excellent temperature coefficient, which helps to ensure reliable performance in a wide range of temperatures.

From the above, it’s clear to see why VDRS07H250BSE is such an attractive option for many applications. It’s designed to provide voltage clamping protection without introducing additional noise or distortion, and its compatibility with high operating temperatures and high voltage is what makes it a great choice for a variety of installations.

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