Transient Voltage Suppressors (TVS)

What is a Transient Voltage Suppressor (TVS) diode?

A transient voltage suppressor (TVS) is an avalanche diode specially designed to clamp overvoltages and dissipate high transient power surges. ST’s Transil™ protection devices are able to shunt a high current surge for a short duration.

Solid-state, monolithic PN junction devices, transient voltage suppressors are used alongside sensitive semiconductors in a parallel protection configuration to ensure protection against electrical overstress (EOS) or electrostatic discharges (ESD).

TVS devices offer many advantages compared to a metal-oxide varistor (MOV) because there are no ageing effects, which ensures stability over time for better reliability.

Providing higher quality and robustness, TVS designs are preferred over Zener solutions, which are rated with low DC current and are not specified for surges.

High-performance TVS devices

ST’s TVS portfolio provides a unique choice of high-performance devices, available in industrial- and automotive-grade (AEC-Q101) versions, to ensure compliance with all regulatory requirements and standards.

Our latest generation of TVS diodes delivers market-leading power density, designed for a large diversity of industrial and automotive applications.

TVS: two operating modes to best fit your application

Transient voltage suppressors have one of two different operating modes:

  • Normal mode, where the device is transparent for the application (low leakage current)
  • Surge suppression mode, where the over-voltage is cut at the clamping voltage value

Featured application note

Discover our Electro-thermal PSPICE models for transient voltage suppressor (TVS).

USB Power Delivery Protection

ESDAxxP protection devices are a space-saving for protecting USB charging circuits to improve device robustness and extend their lifetime

More from Transient Voltage Suppressors (TVS) portfolio


eDesignSuite is a comprehensive set of easy-to-use design-aid utilities ready to help you streamline the system development process with a wide range of ST products.

Thermal-electrical Simulators for Components

Choose design tool:

AC Switches Simulator

Select ratings and application waveforms
Get junction temperature and blocking voltage graphs
Search and sort suitable devices

Rectifier Diodes Simulator

Select ratings and application waveforms
Estimate power losses
Search and sort suitable devices


Supports long mission profiles
Provides power loss and temperature graphs
Helps define heatsink thermal properties

Twister Sim

Help select the right ViPOWER Automotive power device
Supports load-compatibility, wiring harness optimization, fault condition impact and diagnostic analysis
Supports various PCB configurations

TVS Simulator

Specify system ratings and surge waveform
Search and sort suitable devices