An electrical connector assembly includes a dielectric housing having a mating end, a terminating end and a plurality of terminal-receiving passages extending in a direction between the ends. A termination subassembly is fixed to the terminating end of the housing. The termination subassembly includes a circuit board and a plurality of terminal pins extending through the circuit board and into the terminal-receiving passages in the housing. A plastic pin holder is overmolded about portions of the terminal pins at the terminating end of the housing and about at least a portion of the circuit board.