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TVS - Varistors, MOVs

B72650M0141K093 is a surface mount voltage-dependent varistor with a 35 VDC to 45 VDC peak pulse surge voltage rating. It is an integral part of a transient voltage suppression solution, often used to protect semiconductor circuits from damaging transient voltage peaks that exceed the absolute maximum ratings of the semiconductor device. The B72650M0141K093 is a reverse-standing, monolithic, non-linear, non-polar device that is connected in parallel with the protected circuit. In general, varistors suppress a variety of voltage levels and operate over a wide temperature range to protect valuable equipment from transient induced voltage overshoots. The primary purpose of the varistor is to protect the equipment against voltage spikes.

Application Fields

Varistors are primarily used in consumer, industrial, and military applications. They are widely used for overvoltage protection in automotive applications, as they are ideal for high temperatures, and are designed as an integrated part of electronic systems. They are also used in the aerospace and telecommunications fields, in renewable energy systems, in household and lighting control systems, and in medical applications. Varistors are also used in radio and television equipment, in power supplies, and in various other electrical systems.

Working Principle

A varistor is a voltage-dependent, nonlinear resistor made of a semiconductor material, such as zinc oxide. It is designed to change its resistance depending on the voltage applied across the leads. The lower the applied voltage, the lower the resistance of the varistor; the higher the voltage, the greater the resistance. The resistance varies exponentially with the applied voltage, creating an approximately rectangular shape on voltage-current graphs.

When the voltage exceeds the threshold voltage of the varistor, which is typically between 10 and 30 volts, the varistor conducts current. The varistor will then start to conduct current as the applied voltage increases. This conducts current helps to protect the system from overvoltage spikes. As a device, the varistor also helps to reduce current spikes and avoid induced current that could damage components. This helps to reduce system downtime and increases system reliability.

The B72650M0141K093 device is equipped with a set of mechanical trips, allowing the device to be manually activated at any point. The device also contains a bi-directional clamping mechanism, which clamps the voltage to a safe level if the voltage exceed a certain limit. Additionally, this device features current-compensation capability, which actively reduces the current through the device in order to stabilize the high frequency response in the application.

The B72650M0141K093 is a highly reliable electronic component and is designed to operate for extended periods of time in various environmental conditions. This device is constructed with a highly durable plastic package, which can withstand temperatures of up to +105°C. It is an ideal solution for many harsh industrial applications, such as automotive, solar energy, and telecom applications.

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