VDRS20W420BSE

TVS (Transient Voltage Suppressors) are a type of overvoltage protection device used in various electronic systems to protect them from abnormal electrical transients such as those created by lightning strikes or electrostatic discharge. A Varistor (VARiable resISTOR) is a type of TVS which relies on the effect of reverse biased junction PN junctions. MOVs (Metal Oxide Varistors) are a type of Varistor which uses layers of zinc oxide (ZnO).

The VDR S20W420BSE is a very common MOV used in overvoltage protection. It is a half-wave unidirectional device with an operating voltage range of 12 VDC to 420 VDC. It is usually used in switching power supplies, LED lighting, and audio systems, as well as many other devices.

The working principle of the VDR S20W420BSE is quite simple. When an overvoltage is applied to the device, the varistor junction which is formed by the granular zinc oxide, conducts current from the positive side of the applied voltage to the negative side. This current causes the varistor to act as a resistor, reducing the voltage across the device. In doing so, it absorbs some of the excess energy and dissipates it in the form of heat.

The VDR S20W420BSE is designed to be small and compact, and its size does not hamper its performance. It is capable of handling large transients up to 3680 joules, which is more than enough to protect any electronic system from most transient voltages. It also has a high surge current rating of 110A(8/20µs).

In addition, the VDR S20W420BSE is also designed to be highly reliable, with an MTBF (Mean Time Between Failures) of more than 3.2 million hours. This means that it can withstand high levels of voltages and surges without any problem for a long period of time.

Overall, the VDR S20W420BSE is an excellent choice for any overvoltage protection system. Its large transient energy handling capacity, highly reliable construction, and compact size make it a great choice for any electronic system. With its high surge current rating and long mean time between failures, you can rest assured that it will provide reliable protection for your system.