Patent ID: 7563685

Claim:
A method for the production of an NPN bipolar transistor in a p-doped semiconductor substrate comprising the following steps: production of a buried n-doped layer forming the collector, production of a p-doped layer arranged above the buried n-doped layer and forming the base, and of an n-doped layer arranged within the p-doped layer and forming the emitter, so that a first space charge zone is formed between the p-doped layer and the buried n-doped layer and a second space charge zone is formed between the buried n-doped layer and the p-type substrate, which extend in the vertical direction during operation of the transistor with increasing potential at the collector, characterized in that a buried n-doped layer is produced with a doping profile configured in such a way that the first and second space charge zones which extend during operation of the transistor with increasing potential at the collector penetrate through the entire depth of the buried n-doped layer before the critical field strength for a breakdown between collector and emitter is reached.