V220ZS05PX1347

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TVS (transient voltage suppressor) devices are an essential part of circuit design to protect electrical systems from voltage spikes or surges that could otherwise damage or disrupt system operation. Varistors, MOVs (metal-oxide varistors) and other types of TVS devices are available in various electrical configurations and ratings, designed to provide a robust yet cost-effective solution to reinforce protection against surges in circuit applications. A well-known and widely used example is the two-lead radial leaded structure, the V220ZS05PX1347. In this article we explain the applications for and working principle of the V220ZS05PX1347.

Applications for V220ZS05PX1347

The V220ZS05PX1347 TVS device is a two-terminal, bidirectional radial leaded varistor. It is rated for a peak pulse current of 350A, pulse duration up to 8 µs (microseconds), and protection voltage starting from 18V and rising up to 36V at 56°C. This makes the V220ZS05PX1347 ideal for protecting low-voltage, low-power equipment, such as consumer electronics, against transient pulses caused by ESD (electrostatic discharge), EFT (electrical fast transients) and surge applications. It is also particularly well suited for protection circuits for transient suppression and line-to-ground clampers as well as being used for spark gaps in AC line protection.

Working Principle of V220ZS05PX1347

TVS devices, such as the V220ZS05PX1347, are configured to react to excessive voltages occurring in a circuit when a voltage spike or surge occurs. During normal operation, the MOV device’s two terminals are effectively shorted, allowing current to flow without any restriction. The terminals are kept in their open-circuit state until the device’s threshold voltage is exceeded, at which point a voltage sensitive element contained within the device switches on and quickly short-circuits the terminals, limiting the voltage to the desired level. This short-circuiting action is due to the metal-oxide varistor, or MOV, technology employed in the design of the V220ZS05PX1347.

MOVs are constructed from a combination of zinc-oxide and metal oxides such as copper oxide, manganese dioxide and cobalt oxide. They work by changing their basic electrical properties due to the nature of their semiconducting behavior. When the voltage level within the circuit increases beyond the MOV’s threshold, the resistance of the MOV suddenly decreases, effectively short-circuiting the two terminals. This clamping and short-circuiting action takes place within a few microseconds and reduces the voltage level back to an acceptable level. The MOV then reverts back to its open-circuit state, ready to react to the next surge or spike.

Conclusion

The V220ZS05PX1347 is a two-terminal, bidirectional radial leaded varistor providing robust protection against voltage spikes or surges. Its low power and low voltage ratings make it an ideal choice for transient protection of consumer electronics, and it can also be used in a variety of other protection applications. Its performance is based on the metal-oxide varistor, or MOV, technology which activates its surge protection by quickly short-circuiting the two terminals when a voltage spike occurs, reducing the voltage level back to an acceptable level. With its wide range of applications and reliable surge protection, the V220ZS05PX1347 is an excellent choice for providing robust circuit performance in the event of a surge.

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