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TVS (Transient Voltage Suppressors) varistors, also known as snapshot voltage limiters, are electronic components designed to protect other components from high- voltage electrical transients. They are typically used in applications such as power electronics, automotive electronics, avionics, consumer electronics, and medical devices.

TVS varistors are available in various sizes and styles, such as SMD (Surface Mount Devices) varistors, through-hole varistors, and more. They are also available in various voltage ratings, such as 14 VDC, 40 VDC, and more. Depending on the operating voltage, the TVS varistor may be designed to limit a wide range of voltages and currents from a few hundred millivolts to several thousand volts.

The main principle behind the operation of a TVS varistor is that they are designed to conduct current in only one direction, usually during an overvoltage transient. Essentially, they act as a clamp that limits the voltage and current so that the ESD protection device can better protect the component being protected. The TVS varistor works by providing a low-resistance path for the current during an overvoltage transient. This is achieved by a resistive material within the TVS varistor that conducts current as a result of the electrostatic charge being applied.

The operation of a TVS varistor in an ESD protection device is simple. It works by providing a low-resistive path for the current due to the overvoltage transient. This essentially means that the overvoltage current is diverted or “shunted” away from the component being protected, thus reducing or eliminating the risk of overvoltage electrical transients damaging the underlying device or system.

TVS varistors are incredibly useful and are widely used in various applications as important components in power electronics, automotive electronics, avionics, consumer electronics, and medical devices. Their ability to protect components from high-voltage electrical transients makes them an essential component in these applications.

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