A transient-voltage-suppression diode, also transil, transorb or thyrector, is an electronic component used to protect electronics from voltage spikes induced on connected wires.
STMicroelectronics Transil TVS devices
TVS diode as array
Varistor
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A varistor is a surge protecting electronic component with an electrical resistance that varies with the applied voltage. It has a nonlinear, non-ohmic current–voltage characteristic that is similar t
Transient-voltage-suppression diode
…single component. A transient-voltage-suppression diode can respond to over-voltages faster than other common over-voltage protection components such as varistors or gas discharge tubes. The actual clamping occurs in roughly one picosecond, but in a practical circuit the inductance of the wires leading to the…
Metal-oxide varistor manufactured by Siemens & Halske AG.
Western Electric 3B varistor made in 1952 for use as click suppressor in telephone sets
Western Electric Type 44A varistor for click suppression, mounted on a U1 telephone receiver element manufactured in 1958.
High voltage varistor