What Is Breakdown Mechanism?

What are the two mechanisms of breakdown in a PN junction?

The Avalanche Breakdown and Zener Breakdown are two different mechanisms by which a PN junction breaks..

What is the reverse breakdown voltage of Zener diode?

Zener diode specifications Voltage Vz: The Zener voltage refers to the reverse breakdown voltage—2.4 V to about 200 V; can go up to 1 kV while the maximum for the surface-mounted device (SMD) is about 47 V).

What do you mean by breakdown mechanism?

Electrical breakdown or dielectric breakdown is a process that occurs when an electrical insulating material, subjected to a high enough voltage, suddenly becomes an electrical conductor and electric current flows through it.

What is breakdown mechanism in pn junction?

The maximum reverse bias voltage that can be applied to a p-n diode is limited by breakdown. Breakdown is characterized by the rapid increase of the current under reverse bias. The corresponding applied voltage is referred to as the breakdown voltage. The breakdown voltage is a key parameter of power devices.

What is a zener breakdown voltage?

The Zener Breakdown is observed in the Zener diodes having Vz less than 5V or between 5 to 8 volts. When a reverse voltage is applied to a Zener diode, it causes a very intense electric field to appear across a narrow depletion region.

What is mean by avalanche breakdown?

Avalanche breakdown is a phenomenon that can occur in both insulating and semiconducting materials. It is a form of electric current multiplication that can allow very large currents within materials which are otherwise good insulators. It is a type of electron avalanche.

Why does breakdown occur in reverse bias?

When a PN junction is reversed biased it allows very small current to flow through it. … If reverse bias is made too high, the current through PN junction increases abruptly and the voltage at which this phenomenon occurs is called breakdown voltage . At this breakdown voltage , the crystal structure breaks down.

What happens to diode after breakdown?

Breakdown itself does not damage a diode, if the current is limited. … What is important is that if there is no current limiting, the diode will heat until it would burn, and you’ll have a short circuit or open circuit, and it won’t work.

What is breakdown and its types?

Zener Breakdown vs Avalanche BreakdownZener BreakdownAvalanche BreakdownThe VI characteristics of a Zener breakdown has a sharp curve.The VI characteristic curve of the avalanche breakdown is not as sharp as the Zener breakdown.It occurs in diodes that are highly doped.It occurs in diodes that are lightly doped.4 more rows•Nov 20, 2019

What is Zener breakdown mechanism?

The junction breakdown mechanism which occurs in the heavily doped thin region is called Zener breakdown. In this mechanism when the high electric field is applied across the junction, the charge carrier starts jumping across the junction. These electrons constitute the heavy current in the reversed direction.

What is meant by zener voltage?

The Zener voltage is the voltage at which the depletion region completely vanish. The reverse bias applies across the diode increases the intensity of electric field across the depletion region. Thus, it allows the electrons to move from the valence band of P-type material to the conduction band of N-type material.

What is avalanche voltage?

[′av·ə‚lanch ‚vōl·tij] (electronics) The reverse voltage required to cause avalanche breakdown in a pn semiconductor junction.

What is Zener breakdown Class 12?

Valence electrons which break free under the influence of the applied electric field can be accelerated enough that they can knock loose other electrons and the subsequent collisions quickly become an avalanche. This process of sudden release of electrons is known as zener breakdown.

What is Zener effect and Avalanche effect?

The Zener effect is distinct from avalanche breakdown. … The avalanche breakdown occurs in lightly doped junctions, which produce a wider depletion region. Temperature increase in the junction increases the contribution of the Zener effect to breakdown, and decreases the contribution of the avalanche effect.

What is the reverse breakdown voltage?

Reverse Breakdown Voltage – V(br) What It Is: Reverse breakdown voltage is the reverse anode voltage at which the diode conducts a specified amount of reverse current. Since it’s the reverse current across a junction, IR exhibits a knee shaped rise, increasing rapidly once breakdown occurs.

What is reverse breakdown?

Glossary Term: Reverse-Breakdown-Voltage Peak Inverse Voltage (PIV) or Peak Reverse Voltage (PRV) refer to the maximum voltage a diode or other device can withstand in the reverse-biased direction before breakdown. Also may be called Reverse Breakdown Voltage.