82535250 Circuit Protection

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Transient Voltage Suppressors (TVS) are an important and cost effective safety device used for electronics. They are designed to protect the components connected to them against excessive voltage by quickly reducing the voltage to an acceptable value. TVS devices are generally composed of three types: Varistors, Metal Oxide Varistors (MOVs), and Silicon Avalanche Diode (SAD). Each type of device has specific application fields and a different working principle.

The first type of TVS, Varistors, are unidirectional devices. They are commonly constructed out of zinc oxide energy absorbing elements. When a voltage spike higher than the varistor trigger voltage is encountered, the varistor quickly redirects this energy away from the device it is protecting. Varistors also include protection against transients produced by lightning strikes and other sources. The typical response time of a varistor is within the range of nanoseconds, making them ideal for circuit protection.

The second type of TVS, MOVs, are bidirectional devices. MOVs are made of a metal oxide material such as zinc oxide dispersed in epoxy resin. They can absorb energy regardless of the direction in which they are connected and also display a much lower response time than that of a varistor. MOVs are mainly used to absorb low to medium energy impulses. They are also used to protect against overvoltage transients caused by lightning and other external sources.

The third type of TVS, Silicon Avalanche Diode (SAD), are used to protect digital microcontrollers and other media sensitive ICs from extremely high and fast-risetime voltage transients. They provide fast response times of less than nanoseconds and the protection against very high energy spikes. SAD devices have a relatively low maximum allowable voltage compared to other TVS devices and as such, require additional components to protect against lower energy spikes.

In conclusion, each TVS device has its own application field and a different working principle, and it is crucial to choose the right type for the job. Varistors are generally used to protect devices from lightning strikes and other large voltage transients. MOVs are ideal for dealing with transients with lower energy levels, while SADs protect against extreme and fast-risetime transients. All three types of devices can provide a highly cost-effective solution for circuit protection.

The specific data is subject to PDF, and the above content is for reference