A cooling apparatus includes a discrete module and a plastic housing. The discrete module includes a semiconductor die encapsulated by a mold compound, a plurality of leads electrically connected to the semiconductor die and protruding out of the mold compound and a first cooling plate at least partly uncovered by the mold compound. The plastic housing surrounds the periphery of the discrete module. The plastic housing includes a first singular plastic part which receives the discrete module and a second singular plastic part attached to a periphery of the first plastic part. The second plastic part has a cutout which exposes at least part of the first cooling plate and a sealing structure containing a sealing material which forms a water-tight seal around the periphery of the discrete module at a side of the discrete module with the first cooling plate.