VA100018A400DL Circuit Protection

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TVS - Varistors, MOVs is a type of transient voltage surge suppressor, it has multiple applications which provides protection for electrical systems from sudden transients. The main application of TVS devices is transient overvoltage protection from lightning and electrostatic discharges. This article will discuss the VA100018A400DL application field and working principle.

The VA100018A400DL is a low leakage current varistor designed for high-frequency automotive applications. It has a low profile package and is suitable for automotive as well as other high-frequency applications. The device has a 0.8 mm operating temperature range and is capable of operating at a range of -20°C to +105°C for reliable performance.

The VA100018A400DL is composed of MnO₂ and Zinc oxide, two materials that are the foundation of many varistors’ functionality. The MnO₂ is a dielectric insulator that provides the preferred resistance characteristics for sensitivity and reflow and the Zinc Oxide is a ceramic material that provides protection from surge conditions.

This particular device is designed to provide surge protection for automotive and other high-frequency systems. The VA100018A400DL has a low leakage current of 0.2mA at 6V, making it ideal for low power automotive systems. With a clamping voltage of 3.2V, the device offers robust surge protection for transient currents of up to 24A. The transient energy is absorbed and safely dissipated, thus preventing damage to the system.

The VA100018A400DL functions through a two-stage process. First, when an overvoltage transient occurs, a large voltage drop is applied across the contacts and a portion of the transient current is diverted through the varistor. This current flow accelerates the release of electrons from the Zinc Oxide, which act as a semiconductor and reduce the overall voltage applied across the contacts. The second stage of the varistor’s operation involves the MnO₂ acting as an insulator. By increasing the resistance of the MnO₂, the current flow is reduced and the transient voltage is reduced, thus providing protection for the system.

The VA100018A400DL is an ideal device for a variety of automotive and high-frequency applications. It is designed to provide robust and reliable surge protection, with a low leakage current and a wide operating temperature range. With its two-stage operation, it provides effective protection from transient voltage surges and electrostatic discharges.

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