V140LS20AP

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V140LS20AP application field and working principle

TVS - Varistors, MOVs

Varistors are a type of nonlinear element consisting of metal oxide layers formed on ceramic or polymer substrates. These materials exhibit a nonlinear current-voltage (I-V) relationship often referred to as voltage-dependent resistance (VDR). V140LS20AP is a part of Thorlabs’ Varistor product line, designed as an overvoltage protection and current limiting component.

V140LS20AP is a two-terminal bidirectional unidirectional transient voltage suppressor (TVS) that is used for the protection of sensitive electronic equipment against spikes in voltage caused by important stress on the power source. The V140LS20AP is a pneumatic device containing two thin film layers of metal oxide sputtered onto an electrically isolated ceramic base. The two layers, known as the anode and the cathode, act together to dissipate the energy of any transient surge that passes through the device. The metals used in the construction of the V140LS20AP are composed of alumina and titanium dioxide, and the ceramic base is composed of silicone rubber.

The working principle of V140LS20AP is based on the fact that it is a voltage-dependent resistor. When a voltage is applied across the two terminals of the TVS, the metal oxide layers in the device create a ESR (Equivalent Series Resistance) which opposes the flow of current and limits the voltage across the device. This mechanism helps to protect circuits from voltage spikes and reduces their peak current. In general, the higher the peak voltage spike, the greater the peak current that can be handled by the V140LS20AP.

V140LS20AP is commonly used for protecting circuits from transients in various applications, most notably automotive, industrial, and lighting systems. It can be used to protect against the effects of electrical noise, providing noise immunity and overvoltage protection, while also allowing a normal working voltage. The V140LS20AP is capable of handling a wide range of current levels ranging from 10A to 2500A and can clamp transients up to 26V.

V140LS20AP can be incorporated into various design applications, either in series with the protected load where the device can act as a shunt, or in parallel, where it can act as a diverter for excess current or as a short-circuit bridge for fault protection. It is often used in conjunction with power supply and circuit filter designs such as TVS diodes, ferrite beads, rectifiers, and other transient voltage protection devices.

V140LS20AP is a reliable and cost effective solution for voltage protection and has been widely used in a variety of applications. It provides protection from transients while allowing current and voltage to flow normally. It is available in various package configurations, allowing it to be used in high density circuits and applications with limited space. The V140LS20AP is easily incorporated into a variety of design and development projects and is an ideal choice for engineers wanting to ensure their circuits are protected from transient overvoltage.

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