V320LA40B

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TVS - Varistors, MOVs, are compact and effective transient voltage suppression devices designed to protect electronics circuits from voltage related damage and destruction. These components come in a vast range of capacities, shapes, types and sizes with different types of protection such as general purpose, high frequency, low leakage, and pulse rated. Littelfuse\'s Vishay 317LA40B is a radial leaded a Metal-Oxide Varistor (MOV) device used for transient voltage suppression.

V320LA40B Application Field

The Littelfuse 317LA40B is a surface mount Metal-Oxide Varistor (MOV) designed for ESD, over voltage and over current suppression. The device is ideal for protecting sensitive components and circuits from surge voltages arising from lightning, nuclear radiation, and other modes of transient stress. It is also used in the protection of instruments, computer systems, and telecom equipment. It is suited for use in consumer electronics such as pulsed AC power, lighting, computer peripherals, industrial apparatuses, and data communications.

V320LA40B Working Principle

The Vishay 317LA40B consists of a metal oxide disk (whose resistance goes down when the voltage increases), and it is covered on both sides by copper contacts or electrodes. The device works on the principle of thermal equilibrium, or change in electrical signal related to a change in temperature. An increase in voltage across the device causes a corresponding increase in current. Voltage increase causes the resistance of the metal-oxide disk to decrease, which leads to an increase in heater current. This heats up the material and results in a power dissipation. This also limits the surge voltage and prevents damage to the connected circuit.

The V320LA40B is able to dissipate enough energy to protect against potentially damaging overload events, by controlling the current and voltage. This ability to resist and limit electrical surges is known as “clamping voltage”. It helps to prevent excessive current from overwhelming a circuit, and thus, help to prevent damage or destruction of sensitive circuits.

The high frequency transmission properties of the LittelfuseVishay 317LA40Bare also very important. This Metal-Oxide Varistor (MOV) is able to suppress high frequency electrical spikes or transients up to 120 MHz. In order to ensure maximum effectiveness of this high frequency suppression, the user must ensure the following conditions: adequate bonding (ground) of the device, low source inductance of the power line, and use of appropriate over voltage protection.

Conclusion

The Littelfuse Vishay 317LA40B Metal-Oxide Varistor (MOV) is a reliable and cost effective way of protecting sensitive circuits from surges and transients. The device is able to withstand large energy dissipation levels and suppress high frequency electrical spikes up to 120MHz. It is suitable for applications such as devices with pulsed AC power, lighting, consumer electronics, industrial apparatuses, and data communications.

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