An electric motor with a stator housing (2) and with an electronics housing (8), has a first section (A) of the electronics housing arranged on the radial side of the stator housing (2), and a fan (24) arranged on a first axial end (22) of the stator housing (2). The electronics housing (8) extends in the axial direction (X) beyond the first axial end (22) of the stator housing in a manner such that a second section (B) of the electronics housing (8), in whose inside at least one first heat-producing electronic component (58, 60) is arranged, is situated on the radial side of the fan (24). A pump assembly with such an electric motor is also provided.