2322 574 10403 Circuit Protection

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TVS - Varistors, MOVs are ubiquitous in modern electronics and are commonly used to protect electronic devices against electrostatic discharge (ESD), overvoltage, and other transient overvoltage events generated by pulses. The two most common types of transient overvoltage protectors used are metal oxide varistors (MOVs) and silicon avalanche diodes (SADs).

Metal oxide varistors are the predominant type of transient overvoltage protector used today; they provide a wide band of protection from lightning and other overvoltage events. Varistors are composed of two electrodes, which consist of zinc oxide (ZnO) crystals. The ZnO crystals are suspended in a conductive matrix, such as graphite, and are surrounded by a dielectric material, typically a ceramic material. The varistor has a nonlinear mathematical current-voltage characteristic. Current is prevented from flowing until the threshold voltage is exceeded, at which point the voltage-current characteristic becomes exponentially (exponentially nonlinear) conductive, allowing sudden large current flows. These instantaneous large current flows suppress the rise in voltage and reduce or clip transient voltages to a safe level.

Silicon avalanche diodes operate similarly to varistors by providing a wide band of protection but in a smaller package than a varistor can provide. Silicon avalanche diodes use a PN junction to stop the current until the breakdown voltage is reached. The PN junction is comprised of a reversed biased P-type material and an N-type material, which creates a potential barrier. An avalanche breakdown occurs when the voltage reaches the breakdown voltage. The creation of electron-hole pairs due to the collision of electrons with the potential barrier results in an avalanche of current, which can help to reduce transient voltages to a safe level.

The 2322 574 10403 application field and working principle is a common application field for both TVS - Varistors and MOVs. This application is widely used in the telecommunications industry, where lightning is a common occurrence. In this application, the TVS - Varistors or MOVs are used to protect this equipment from overvoltages caused by lightning. The device works by providing a low impedance path to ground when an overvoltage event occurs. This allows the current to flow into the ground, thereby protecting the equipment from damage.

The 2322 574 10403 application field and working principle can also be found in the automotive industry, where electrical spikes caused by back EMF generated during a relay switching operation can cause significant damage. The TSD or MOVs can be used here to limit the voltage surges caused by the back EMF, and therefore protect sensitive electronics from being damaged. The working principle is the same as in the telecommunications industry where a low impedance path to ground is provided to reduce the transient voltage to a safe level.

In conclusion, TSD - Varistors and MOVs are crucial components in the electronic industry for providing protection against transient overvoltage events. They are commonly used in the telecommunications and automotive industries, as well as in other industries, to protect vulnerable electronic components from transient overvoltages. The 2322 574 10403 application field and working principle are among the most common applications of these components and serve to provide protection against lightning and back EMF.

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