An electronic device for an electric powertrain of a vehicle is disclosed. The device includes a power module assembly having a housing that defines a first side, and an array of power modules disposed within the housing. Each of the power modules includes first electrical contact patches at least partially embedded in the first side and having an attachment surface substantially parallel to the first side. A capacitor assembly includes a housing defining a second side that is substantially coplanar with the first side, and an array of second electrical contact patches at least partially embedded in the second side. The second electrical contact patches have an attachment surface substantially parallel to the second side. A busbar mechanically and electrically couples at least one of the first contact patches to at least one of the second contact patches.