V82MA3A

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Varistors, also called voltage-dependent resistors (VDRs), are electrical components made of a sintered mixture of metal oxide. This material has a non-linear, symmetric resistance-voltage curve, which has a much smaller resistance value at low voltages and a much higher resistance value at higher voltages.

This type of component is particularly useful for applications such as surge protection, high speed switching, and EMC (electromagnetic compatibility).Varistors are composed of two metallic electrodes, one running along the central axis of the cylindrical core, and a second one providing the surface area for the full sintering. This second electrode is sometimes connected to an external lead for measuring and testing the device. Varistors are generally rated for operation up to 1.5kV, with higher ratings of up to 15kV available for some applications.

V82MA3A is a surface-mounted metal oxide varistor (SMD MOV) designed to protect printed circuit boards (PCBs) and sensitive electronics from transient over voltage conditions. The device is mainly used in telecom, industrial, computer, and consumer equipment designed for line transient protection. It has a high surge strength of up to 400A, a clamp voltage of 7.3 – 8.2V, and a surge current rating of 88A (8/20 μ milliseconds) for a peak current of 1.2kA. It also features a rated working voltage of 270V AC.

The working principle of V82MA3A is straightforward. In a normally biased system, no current passes through the varistor as long as the voltage on the circuit remains within the specified design limits. However, once a sudden over voltage spike occurs, the varistor conducts electricity and limits the voltage to a safe level. To accomplish this, the varistor works by reducing the total time of an over-voltage surge and re-directing the high energy currents away from the ICs on the board, thereby preventing them from burning out. The V82MA3A is designed to reduce over-voltage transients to levels that are safe for the connected components, while ensuring that normal operations are not affected.

The device also features a high power dissipation capability, a wide operating temperature range, and high peak current surge protection. These features make the V82MA3A ideal for telecom, industrial, and consumer applications. It can also be used for high speed switching applications in automotive systems.

The V82MA3A provides excellent over-voltage surge protection with low leakage current, low power dissipation, and a high surge capacity. Its ability to withstand high electrical surges and its wide operating temperature range make it the ideal choice for many applications.

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