Question

What is the significance of breakdown voltage in zener diode?

Answer 1

Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits. When connected in parallel with a variable voltage source so that it is reverse biased, a Zener diode conducts when the voltage reaches the diode's reverse breakdown voltage.

Answer 2

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Zener Breakdown :

• This kind of breakdown occurs in heavily doped pn junction.
• Since p and n regions are heavily doped depletion layer of junction is very narrow. The reverse bias voltage sets up an electric field across the depletion layer.
• When the applied reverse bias increases, the electric field at junction becomes larfe enough to break covalent bonds of atoms,thereby generating a large number of electron hole pairs.

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