V181DHB34

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Transient Voltage Suppressors (TVSs), also known as Varistors, are electronic devices that can be used to protect circuits from undesirable voltage transients. TVSs, most commonly used in power supplies or any application requiring protection from electrical spikes, are able to clamp or limit the voltage at their terminals to a certain level that is safely below the breakdown voltage of sensitive components used in a circuit. This article will provide an overview of the use and working principle of one such TVSs, the V181DHB34.

Application Field of V181DHB34

The V181DHB34 is a transient voltage suppressor from STMicroelectronics. It offers protection from transients up to 305 volts, and can withstand more than two consecutive transient occurring every 10µs. It can thus be used in applications requiring long-term protection from transient events. This device is capable of operating at operating temperatures ranging from -55°C to +150°C, and its hermetically sealed package ensures adequate protection against external environmental conditions. Its two-terminal package allows for a simple and efficient installation of the device in the target circuit.

The V181DHB34 is well suited for applications such as automotive electronic control units, industrial computers, telecom equipment, as well as other applications requiring enhanced ESD protection.

Working Principle of the V181DHB34

The working principle of the V181DHB34 is based on the principle of a Metal-Oxide Varistor (MOV). A varistor is a semiconductor device with two electrodes and an oxide insulator between them. At normal temperatures, the varistor is in its off state, meaning no current flows between the two electrodes. When a voltage greater than the breakdown voltage (the maximum voltage the device can withstand) is applied to the varistor, it goes into conduction mode and current flows between the two electrodes.

The V181DHB34 is designed to quickly clamp the voltage between its two terminals to protect connected components from damage due to overvoltage events. Once the transient voltage is dissipated, thermal balance of the device is restored and it goes back to its off state. It is able to protect against multiple transient events by re-establishing its normal operating state after each transient.

Conclusion

The V181DHB34 is an efficient transient voltage suppressor designed to protect against transient voltage events. It is a device capable of operating at temperatures ranging from -55°C to +150°C, and is hermetically sealed for optimal protection from external environmental conditions. Its two-terminal package ensures easy and efficient installation in target circuits. Its working principle is based on the Metal-Oxide Varistor effect, meaning it can clamp or limit the voltage applied to it in the event of a transient voltage surge.

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