B72220P3271K101

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TVS - Varistors, MOVs - are used for a variety of applications ranging from overvoltage and spike protection to EMI/RFI noise filtering to signal conditioning. In this article, we’ll discuss the application field and working principle of the B72220P3271K101 Varistor.

Application Field of B72220P3271K101 Varistor

The B72220P3271K101 Varistor is a high voltage varistor designed for overvoltage and spike protection, as well as EMI/RFI filtering. It has a high safety factor, tolerance to high surges, and lower power dissipation which makes it suitable for a variety of applications such as battery charger protection, microwave oven, LCD, PLED, overvoltage power supply, etc. The B72220P3271K101 Varistor is an ideal solution for surge protection in the medical field, communications industry, automotive applications, industrial controls, and more. It is available in an SMD product package with lead-free soldering, minimizing construction space and cost.

Working Principle of B72220P3271K101 Varistor

The B72220P3271K101 Varistor is based on a zinc oxide varistor principle. It consists of many zinc oxide (ZnO) beads, which act as a resistance at a certain voltage by varying the electric field strength. The resistance of the varistor increase with increasing voltage until it reaches its maximum resistance, known as the breakover voltage. At this point, the current will be diverted and the ZnO beads will start to become conductors as the varistor starts to provide short circuiting.

During normal operations, the voltage applied to the Varistor’s input will be constant and the electric field strength will remain constant as well. However, when an overvoltage or spike occurs, the electric field strength increases, causing the resistance of the varistor to increase. This increase in resistance will limit the current flowing in the circuit and protect it from any further voltage increase. The Varistor will act as a current limiter by diverting the surge current away from the sensitive components in the circuit.

The Varistor can also act as a low-pass filter, blocking any high-frequency noise and protecting the connected attached circuit from overvoltage. It also provides short-duration ESD protection and can self-heal from harmless overshoots.

Conclusion

The B72220P3271K101 Varistor is an ideal solution for overvoltage and spike protection, as well as EMI/RFI filtering. It is capable of providing the right amount of current limiting and EMI/RFI filtering in a reliable and cost-effective package. With its high safety factor, tolerance to high surges, and lower power dissipation, the B72220P3271K101 Varistor is the perfect choice for a variety of applications.

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