An electrical connector includes a dielectric housing having a tongue including an upper surface, a lower surface, and opposite side surfaces. A plurality of signal contacts are held by the housing and are exposed along the upper surface. At least one power contact is held by the housing and is exposed along one of the opposite side surfaces. Optionally, the tongue and signal contacts define an eSATA mating interface configured for mating with a plug of a serial cable defining an eSATA plug interface.