Abstract: A current mirror having at least one pnp-transistor and providing overvoltage protection has three collectors designed as partial collectors. Two of the partial collectors and the base are linked to a reference-current source and the other partial collector is linked to a terminal connection of the current source to be protected from overvoltage. In the event of an overvoltage across the terminal connection, an emitter is formed by the partial collector linked to this terminal connection which limits the received current in proportion, conditional upon the topology, with the mirror-reference current.