Zener diode works:
in forward bias only.
in reverse bias only.
as a voltage regulator in forward bias and as a simple pn junction diode in reverse bias.
as a voltage regulator in reverse bias and as a simple pn junction diode in forward bias.
A Zener diode is a heavily doped p-n junction diode specially designed to operate in the reverse breakdown region. When reverse-biased, it functions as a voltage regulator, maintaining a constant output voltage over a wide range of currents. However, when it is forward-biased, it behaves exactly like a standard simple p-n junction diode.
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