Investigations on double-diffused MOS (DMOS) transistors under ESD zap conditions

In this paper we analyzed, through experiments and 2D simulations, the behaviour under high reverse voltages of a DMOS transistor. It turned out that the drift diffusion region (resistor) between the drain contact and p-diffusion region (PI) plays an important role both in the switching-on of the parasitic bipolar structure and in the failure mechanism.