是加在PN结上的反向电压增大到一定数值时,出现的一种击穿现象。PN结中的电子和空穴在强电场作用下,获得极大的动能,并去碰撞其它原子使它们电离,激发出大量的电子空穴对,使反向电流迅速增大。这种击穿现象来势很猛,有如雪崩之势,所以称为雪崩击穿。 Is added to the PN junction of the reverse voltage increases to a certain value, the breakdown of a phenomenon. PN junction in the electron and hole under the action of a strong electric field, to obtain great kinetic energy, and to collide with other atoms so that they ionized, excited a large number of electron-hole pairs, so that the rapid increase of reverse current. This breakdown is very fierce, as the avalanche potential, so called avalanche breakdown.