VE09M00211K

TVS - Varistors, MOVs

TVS, or Transient Voltage Suppressor, is a device used to protect circuits from being damaged by excessive voltage. It is commonly used in the field of telecommunications, automotive, consumer electronics, industrial, and military applications. Varistors, MOVs, or metal oxide varistors, are a subset of TVS devices. This article will discuss the VE09M00211K application field and working principle.

Application Field

The VE09M00211K is a metal oxide varistor with a ceramic housing specifically designed for use in a wide range of consumer and automotive applications. It has an ultra-wide operating temperature range of -55°C to +150°C and a maximum diameter of 8.2mm. The varistor is suitable for protecting circuits from transient voltage surges, such as in automotive or other harsh environments. It can also provide overvoltage protection on test equipment, PCBs, and in data centers.

Working Principle

The VE09M00211K is a nonlinear resistor that absorbs excess voltage above its breakdown voltage to prevent overvoltage conditions. When the circuit is normal and the applied voltage is below the breakdown voltage, the device behaves like an open circuit. However, when the voltage rises above the breakdown voltage, it starts to conduct and dissipates the excess voltage as heat. This absorption of the excess voltage ensures that the protected circuit remains safe.

Metal oxide varistor typically consists of a core composed of zinc oxide grains sandwiched between two metal plates. The zinc oxide grains are polarised and, when a voltage is applied, the grains separate resulting in a polarized core. This results in the varistor having a low resistance when the applied voltage is below the breakdown voltage, but a high resistance when the voltage is above the breakdown voltage.

Conclusion

The VE09M00211K is a metal oxide varistor designed for use in harsh environments and data centers. It has a wide operating temperature range and maximum diameter of 8.2mm. The device absorbs the excess voltage above its breakdown voltage to reduce the possibility of circuits being damaged, and the zinc oxide grains, which make up the core of the device, allow for a low resistance when the applied voltage is below the breakdown voltage.