B72210S0400K551

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The B72210S0400K551 is an extremely popular Part Number from the comprehensive EPCOS range of TVS - Varistors, MOVs. It is widely used for its superior electrical characteristics in applications ranging from industrial machines, laboratory equipment, and power generators to consumer electronic devices. This article will provide an overview of the application filed and working principles of this part number.

Application Field

The B72210S0400K551 is a Varistor or Metal Oxide Varistor. It is used to efficiently clamp and dissipate overvoltage caused by transients, including spikes or surges. The device works by providing an adjustable resistance in the circuit in order to control current and voltage levels. The device can also accommodate ESD pulses that may occur in electronic systems. As such, it can be used to enhance the reliability and safety of circuits.

The part number can be found in a variety of applications including: power control systems, switch-mode power supply, general purpose protection, consumer electronic, automotive, medical, and communication systems.

In the automotive sector, this part number is often used to suppress EMI/RFI interference caused by electromagnetic fields, which can lead to considerable damages to other on-board electronic components. In power control systems, it plays an essential role in stabilizing the current and voltage levels and preventing short circuits.

Working Principle

The working principle of the B72210S0400K551 is based on the Metal Oxide Varistor (MOV) effect. This is a phenomenon where electrons in an oxide semiconductor are agitated by the presence of an external voltage, which causes a change in the device’s resistivity. When this happens, the current is clamped and energy is flowing into the device from the circuit. This, in turn, dissipates the excessive voltage by transforming it into heat.

The ZnO particles embedded in the device work as a gate for the current, which can only flow when a certain voltage threshold is reached. This is why the B72210S0400K551 has such excellent performance in suppressing overvoltage conditions. Additionally, the device is made of materials suitable for use in various temperature ranges and environments. This offers the added benefit of long-term performance and mechanical robustness.

Conclusion

The B72210S0400K551 is an extremely versatile and reliable Varistor or MOV device that can be used in numerous protection applications. It features a wide working temperature range, good surge current handling capability, and excellent resistance to ESD pulses. This ensures the smooth operation and safety of a variety of electronics.

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