KSP2222A NPN 40V 0.6A 300MHz Fairchild Foto SARS02 Sanken 1,25A 800V Use in SMPS with flyback FotoīU2708AF (High voltage Vceo = 825V Ic = 8A, high speed switching NPN transistor) Thus, use of avalanche diodes in selected applications can result in improved reliability. In many applications, avalanche diodes will survive while normal diodes will fail. They are well suited for use in protective applications, inductive circuits, high voltage circuits and when connecting diodes in series.
Diodes designed to control this phenomenon are called avalanche diodes. Unless it can be clearly shown that the peak inductive transient voltage cannot exceed the voltage rating of the diode, avalanche diodes are the preferred type for this application.Īvalanche diodes are designed to break down at a well-defined reverse voltage without being destroyed.
Motors, relays, solenoids and motor starters are typical of equipment, which are capable of rupturing ordinary silicon rectifiers. Particular care should be exercised when specifying rectifiers for these applications, especially for the freewheeling diode placed across and inductive load. Inductive loads, upon interruption, generate voltage transients.
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Thus, whenever diodes are connected in series to increase the voltage rating, avalanche diodes should be used. Also, the avalanche diode is capable of protecting itself by handling transient energy, providing it does not exceed the energy rating of the diode. However, avalanche type diodes will cause the voltage to divide much more evenly. A typical diode will exhibit catastrophic failure when this occurs. A transient of sufficient amplitude will drive the voltage across one or more diodes into the breakdown region. Since there could be large variation in the reverse resistance, the voltage may not divide equally across the series string of diodes. The voltage normally divides in proportion to the reverse resistance of each diode. They are faster than MOV’s, zeners, and gas tubes.Īvalanche diodes are the diode type of choice in high voltage circuits, such as high voltage multipliers, due to possibility of transients caused by arcs, pulses, etc.Īnother usage for rectifiers with avalanche capability is putting individual diodes in series to obtain higher reverse voltage capability. 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.
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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. RK36 2A 60V Schottky Diode Sanken Japan FotoįMB-G24H 10A 40V Schottky (High frequency rectifier) Foto RL2Z 2A 200V Sanken Japan fast diode Foto UG2G 2A 400V Gulfsemi Ultrafast Recovery FotoĢ0NFA40-FA1 2A 400V FRED/Ultra fast NIEC Japan RG2A 1A 600V Sanken Japan fast diode Foto Diode, Transistor Germanium, Mosfet, IC RegulatorīYM26C 2,A 600V Dioda kacang Philips Foto Fundamentalally the program works in two ways.
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