Question

friends can you explain what is zener diode​

Answer 1

Answer:

Using Zener diodes as constant-voltage diodes

The Zener voltage across a diode remains constant over a wide range of Zener current. Because of this property, Zener diodes are widely used as constant-voltage devices.

Using Zener diodes as voltage detection devices

A Zener diode permits Zener current, Iz, to flow when the voltage is above the specified Zener voltage.

Thus, a Zener diode can be used for voltage detection by sensing Zener current with some other device.

A Zener diode provides voltage clipping if it is used over the entire region highlighted as 1 and 2 in the following figure.

It helps to clip all noise above a certain magnitude such as an electrostatic discharge.