An electrical connector includes a row of terminals (20) having a pair of differential signal terminals (21) mounted on a mating tongue (11). Each of the signal contact terminals has a rear end (211) on a back outer face of the connector and a free mounting end (213) away from the back outer face. The free mounting ends are located on a first end row and bent from the rear ends and away from each other in opposite transverse directions so as to widen a pitch therebetween to improve impendence for decreasing interference.