A plug connector includes a housing with a rear base and a front mating tongue in a mating direction and a plurality of terminals arranged in the housing in a lateral direction. The front mating tongue defines a first face and a second face. The first side defines a rib thereby the first face being divided to a first mating face, a third mating face and a second mating face on the rib. The second face is defined as a fourth mating face. The terminals include plate portions exposed upon the mating tongue and mounting legs outside the housing. The terminals are divided to four groups, the plate portions of the four groups are exposed upon the mating faces respectively. Each of the first and second groups of terminals includes grounding terminals and differential signal pairs, the plate portions of the differential signal pairs have a length equal to 3.2 mm.