V140LA20C Circuit Protection

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Transient Voltage Suppression (TVS) devices, such as metal oxide varistors (MOVs), are designed to protect sensitive electronics or components from surges in voltage and current. Varistors, also known as voltage-dependent resistors (VDRs), are one of the most commonly used TVS devices. To provide a better level of protection, TVS devices come with various ratings that are based on their maximum capability and the allowed overvoltage stress. The V140LA20C is one of the latest MOVs developed by Littelfuse and is specifically designed as a low-voltage MOV.

The V140LA20C has a wide range of application fields, including power supplies, motor controllers, electric vehicles, appliances, datacom equipment, industrial automation, automotive products and many more. It is designed to provide transient overvoltage protection for low voltages, ranging from 1 kV to 7 kV in power supplies and up to 15 kV in automotive ignition systems. Furthermore, it is designed with the ability to withstand high-energy perpulse overvoltage.

The V140LA20C MOV is a low voltage part with a peak pulse current rating of 140A. This is higher than many other similar parts available in the market. Furthermore, its peak pulse power dissipation is 265 watts and its response time is less than 1ns. The device also features a low capacitance, of less than 40pF, and a brief on-state voltage of less than 1V, which is beneficial for the tight requirements of power supply designs.

The V140LA20C MOVs work by dissipating excess voltage as heat with the core material at its center. This material is usually zinc oxide, which is able to exhibit nonlinear resistivity, depending on the applied voltage. When the media voltage is within the breakdown voltage, the MOV will conduct current and start to exhibit a resistivity of less than 1W. This allows the MOV to absorb energy and dissipate heat, protecting the device and other components from overvoltage and transients.

The components of the V140LA20C MOV are protected in an epoxy package, which also contributes to extra stability. The epoxy package is designed to provide mechanical and electrical isolation for the MOV elements, so as to prevent arcing and short-circuiting. Furthermore, the package is resistant to chemical solvent and thermal shock, and its temperature range is up to 125°C.

The V140LA20C MOV is a versatile and reliable device that provides excellent protection for low voltage power supplies and other equipment. Thanks to its high peak pulse current rating and low capacitance, the device is suitable for a wide range of applications, from power supplies and motor controllers to automotive and industrial equipment.

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