Answer / m nagaraju iiit nuzvid

Avalanche break down is due to low doping levels at high
reverse bias voltages.Here at high thermal energy new
electrons are generated they collide with crystals of new
electrons produces new one in geometric
progressions......i.e it is due to collision by ionization.

Where as Zener break down is due to High doping levels at
low reverse voltages. a electrons can find a new electron in
near so small voltages can use them to expel from the
valency so it is due to High field emission.

Answer / prabhakar reddy

ZENER OCCURS AT SHARPLY AT CUT IN VOLTAGE.BUT THE AVALANCHE
OCCURS WITH COLLOSION PROCESS

Answer / bijeesh p

Avalache break down is the secondary break down it is irreversible & zener break down is primary break down it reversible .

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