Difference between Zener Breakdown and Avalanche Breakdown:
The difference between Zener Breakdown and Avalanche Breakdown is given in table below
|This is observed in zener diodes having reverse voltage of less than 5 volts.||This is observed in zener diodes having reverse voltage of 5 or more volts.|
|The valance electrons are pulled into conduction band due to very intense electric field appearing across the narrow depletion region.||The valence bands are pushed into conduction band due to
the energy imparted by colliding accelerated minority carriers.
|The breakdown voltage decreases with the increase in temperature i.e. temperature coefficient is negative.||The breakdown voltage increases with the increase in temperature i.e. temperature coefficient is positive.|
|V-I characteristics with the zener breakdown are very sharp.||V-I characteristics with the avalanche breakdown rise gradually. It is not as sharp as that with the zener breakdown.|