The Transient Voltage Suppress or diode (also known as a TVS Diode, transil or thyrector) is a protection diode designed to protect electronic circuits against transients and overvoltage threats such as EFT (electrically fast transients) and ESD (electro-static discharge).

TVS (Transient Voltage Suppressor) diodes are components that are used to protect sensitive components such as semiconductors. Applications of Transient Voltage Suppressor Diode can be found in Data and Signal lines, Microprocessor and MOS memory, AC/DC power lines, and Telecommunication Equipments. Its main features: low clamping voltage, doesn't degrade, broad voltage spectrum,extremely fast reseponse time, limited surge current rating, high capacitance for low voltage types.