V140LT20CP

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TVS Varistor and MOVs are usually used for surge protection, although both serve same purpose, Varistors and MOVs have some distinct application field and working principle. The V140LT20CP from Vishay, which delivers 1400A 8/20µs surge current protection, belongs to the TVS (Transient Voltage Suppression) Varistor. It is designed to provide 5V series overvoltage protection for IEC 61000-4-2 and other ESD protection standards.

Broadly, the Varistor is made up of an array of metal oxide varistors (MOVs) connected in series and parallel. The V140LT20CP consists of these MOVs connected in such a way that it forms a voltage clamping circuit. The device is a bi-directional TVS with symmetrical quick-response response to uni-directional surge transients, such as ESD. The various electrical parameters for V140LT20CP are : Trip Point Voltage, 70V maximum; Operating Voltage, 35V maximum; Leakage Current, 5µA maximum; surge Current, 1400A Maximum; Maximum Power Rating @ 25℃, 2.9W; and Clamping Voltage, 87.5V maximum.

The operating principle behind the V140LT20CP is that when the incoming voltage exceeds the breakdown voltage of the Varistor, this device starts to conduct. This creates a low impedance path for the surge current to flow through it and thereby protecting the connected electronic components from the surge. It does this in a fraction of a second and is thereby capable of providing protection against even the quickest of transients. By forming a low impedance, the device successfully dissipates the surge energy and helps reduce an overvoltage situation.

Varistors are mostly used with a suppressor, such as fuse, MOV, Transient Voltage Suppressor (TVS) diode and Circuit Breaker, to provide complete protection from fluctuation and restoration of normal power supply. V140LT20CP is suitable for use in applications that need uni-directional surge protection, such as in computer peripherals, consumer electronics, power supplies, telecommunication systems and lighting systems. It is also useful for protecting outdoor systems such as antennas and solar system.

Varistors and MOVs both have their own unique application field and working principle. The V140LT20CP series Varistor provides reliable and effective surge protection, due to its uni-directional surge protection capabilities and fast clamping response. This device is perfect for protecting against damaging phenomena such as ESD. As evidenced by its wide range of potential applications, the V140LT20CP series Varistor can be effectively used in a variety of devices, to provide efficient surge protection.

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