Power semiconductor module with deflection-resistant base plate

A power semiconductor module, having a metal base plate with an upper surface and defining a longitudinal direction, for mounting on a heat sink, said module comprising:

• a framelike housing;
• a cover for covering said module;
• terminal elements, leading to the outside of said housing, for load contacts and auxiliary contacts;
• and
• at least one electrically insulating substrate, disposed inside said housing, said substrate having an insulating body and a plurality of metal connecting tracks, electrically insulated from one another, located on a first main face of said substrate, remote from said base plate, power semiconductor components located on said connecting tracks and electrically connected to said connecting tracks, and at least one metal layer located on a second main face of the substrate, facing said toward said base plate, wherein said substrate is disposed on said base plate, and
• wherein said base plate has a stiffening structure, which extends along said longitudinal direction of said base plate, and said stiffening structure is formed of said base plate material itself by deformation, and protrudes out of said upper surface of said base plate.