Explain zener diode?

Hi Umang!

 

Zener diode is a special purpose P-N junction diode. It was invented by Clarence Zener. A zener diode works as a normal P-N junction diode in the forward biased condition. The specialty is that, it is designed to operate in the reverse biased condition! The normal diode will not allow current flow in the reverse biased condition, and if the reverse voltage exceeds the breakdown voltage, the diode may get permanently damaged. But the zener diode will not damage, even if the reverse voltage exceeds the breakdown value. The voltage across the zener diode will stay stable, irrespective of the input voltage. So the zener diode is ideal for applications requiring stabilized voltages.

 

Cheers!!

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Zener diode is made from highly dopped p and n type semiconductors.

The depletion layer of such diode is very small and the electric field across the junction is very high. When reverse voltage is increased,the electrons tunnel the depletion layer and a largecurrent flows.

  • 4

A Zener diode is a special kind of diode which allowsr current to flow in the forward direction in the same manner as an ideal diode,r but will also permit it to flow in the reverse direction when the voltage isr above a certain value known as the breakdown voltage, "Zener knee voltage"r or "Zener voltage." The device was named after Clarence Zener, whor discovered this electrical property.

r r

 

r r

A conventional solid-state diode will not allow significantr current if it is reverse-biased below its reverse breakdown voltage. When ther reverse bias breakdown voltage is exceeded, a conventional diode is subject tor high current due to avalanche breakdown. Unless this current is limited byr circuitry, the diode will be permanently damaged due to overheating. In ther case of a large forward bias (current in the direction of the arrow), the dioder exhibits a voltage drop due to its junction built-in voltage and internalr resistance. The amount of the voltage drop depends on the semiconductorr material and the doping concentrations.

r r r

A Zener diode is a special kind of diode which allowsr current to flow in the forward direction in the same manner as an ideal diode,r but will also permit it to flow in the reverse direction when the voltage isr above a certain value known as the breakdown voltage, "Zener knee voltage"r or "Zener voltage." The device was named after Clarence Zener, whor discovered this electrical property.

r r

 

r r

A conventional solid-state diode will not allow significantr current if it is reverse-biased below its reverse breakdown voltage. When ther reverse bias breakdown voltage is exceeded, a conventional diode is subject tor high current due to avalanche breakdown. Unless this current is limited byr circuitry, the diode will be permanently damaged due to overheating. In ther case of a large forward bias (current in the direction of the arrow), the dioder exhibits a voltage drop due to its junction built-in voltage and internalr resistance. The amount of the voltage drop depends on the semiconductorr material and the doping concentrations.

A Zener diode is a special kind of diode which allowsr current to flow in the forward direction in the same manner as an ideal diode,r but will also permit it to flow in the reverse direction when the voltage isr above a certain value known as the breakdown voltage, "Zener knee voltage"r or "Zener voltage." The device was named after Clarence Zener, whor discovered this electrical property.

r r

 

r r

A conventional solid-state diode will not allow significantr current if it is reverse-biased below its reverse breakdown voltage. When ther reverse bias breakdown voltage is exceeded, a conventional diode is subject tor high current due to avalanche breakdown. Unless this current is limited byr circuitry, the diode will be permanently damaged due to overheating. In ther case of a large forward bias (current in the direction of the arrow), the dioder exhibits a voltage drop due to its junction built-in voltage and internalr resistance. The amount of the voltage drop depends on the semiconductorr material and the doping concentrations.

r r r

A Zener diode is a special kind of diode which allowsr current to flow in the forward direction in the same manner as an ideal diode,r but will also permit it to flow in the reverse direction when the voltage isr above a certain value known as the breakdown voltage, "Zener knee voltage"r or "Zener voltage." The device was named after Clarence Zener, whor discovered this electrical property.

r r

 

r r

A conventional solid-state diode will not allow significantr current if it is reverse-biased below its reverse breakdown voltage. When ther reverse bias breakdown voltage is exceeded, a conventional diode is subject tor high current due to avalanche breakdown. Unless this current is limited byr circuitry, the diode will be permanently damaged due to overheating. In ther case of a large forward bias (current in the direction of the arrow), the dioder exhibits a voltage drop due to its junction built-in voltage and internalr resistance. The amount of the voltage drop depends on the semiconductorr material and the doping concentrations.

A Zener diode is a special kind of diode which allowsr current to flow in the forward direction in the same manner as an ideal diode,r but will also permit it to flow in the reverse direction when the voltage isr above a certain value known as the breakdown voltage, "Zener knee voltage"r or "Zener voltage." The device was named after Clarence Zener, whor discovered this electrical property.

r r

 

r r

A conventional solid-state diode will not allow significantr current if it is reverse-biased below its reverse breakdown voltage. When ther reverse bias breakdown voltage is exceeded, a conventional diode is subject tor high current due to avalanche breakdown. Unless this current is limited byr circuitry, the diode will be permanently damaged due to overheating. In ther case of a large forward bias (current in the direction of the arrow), the dioder exhibits a voltage drop due to its junction built-in voltage and internalr resistance. The amount of the voltage drop depends on the semiconductorr material and the doping concentrations.

r r r

 

r r

 A Zener Diode is ar special kind of diode which permits current to flow in the forward direction asr normal, but will also allow it to flow in the reverse direction when ther voltage is above a certain value - the breakdown voltage known as the Zenerr voltage.

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