The invention relates to a heat sink (1) for cooling an electrical component. The heat sink (1) is used in a power converter device (21), in particular, at least for cooling the power semiconductors (53) present there. The heat sink (1) according to the invention serves for combining two cooling devices. For this purpose, the heat sink is configured in such a way that it has a first cooling device (5) and a contact area (9), which is provided for dissipating thermal energy to a second cooling device (15), or that the heat sink (1) has a first cooling device (5) and a second cooling device (15).