Computer model for transient voltage suppressors

Transient voltage suppressors are semiconductor devices used to clamp transients and save the equipment from excessive voltage spikes. The problem with these devices is that the protection voltage increases with the duration and amplitude of the transient. A SPICE (simulation program with IC emphasis) model that permits the calculation of the protection voltage increase for different overvoltage wave shapes is presented. The model is an efficient tool to evaluate transient suppressor performance