Avalanche Breakdown


When high reverse voltage is applied to the P-N junction then electrons of P-N junction acquire high enough velocity to dislodge valence electrons from the semiconductor.These new electrons from. These new elecrrons in turn free other electrons. in this way we get more electrons in P-N junction this situation is called avalanche breakdown.

Zener Breakdown


When high reverse voltage is applied to diode then a maximum value of voltage where we get high current these voltages is called zener breakdown voltage ad this phenomenon is given by scientist C-Zener voltage. Zener voltage is achieved by highly depped of P-N junction diode