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Due to its high speed and ability to withstand large numbers of transients, avalanche diodes are used to protect circuits against surges, lightning and other transients. Applications include protection against transients, such as in high voltage or inductive circuits, and when putting diodes in series.Īvalanche type diodes can result in increased reliability in many applications, particularly those where voltage transients are expected.

Avalanche breakdown can occur within solids, liquids, or gases when the voltage applied across the insulating material is great enough to accelerate free electrons to the point that, when they strike atoms in the material, they can knock other electrons free.Īvalanche occurs extremely quickly, and as a result, avalanche diodes are the fastest surge-suppression devices. It is a form of electric current multiplication that can allow very large currents to flow within materials which are otherwise good insulators. Thus, avalanche type diodes are often used in protecting circuits against transient high voltages which otherwise would damage the circuit.Īvalanche breakdown is a phenomenon that can occur in both insulating and semiconducting materials. However, if the diode is designed to control the avalanche phenomenon, the diode can tolerate avalanche caused by overvoltage, and remain undamaged. When avalanche occurs in a typical diode or other semiconductor, it generally causes catastrophic failure. This is somewhat similar, but not identical to Zener breakdown. An avalanche diode is a diode that is designed to break down and conduct at a specified reverse bias voltage. Increase Reliability by Using Avalanche DiodesĪvalanche occurs in diodes when the voltage across a diode exceeds a specified value.

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