Quasisaturation-region operation of n–p–n−–n power transistors
A 2-dimensional mathematical model is utilised to predict the internal behaviour of a typical n–p–n−–n power transistor operating under steady-state conditions. Results of the analysis for the quasisaturation-region operation indicate the extension of the base region in the n− collector and the presence of appreciable minority charge carriers in the inactive base region under the base contact.