An electrical connector (1) for interconnecting integrated circuits (ICs) to a circuit board, includes an insulative housing (2, 3) defining a plurality of passageways extending therethrough, and a plurality of contacts received respectively in each of the passageways of the insulative housing. The insulative housing has a first base (2) adapted to connecting an IC to a circuit board and a second base (3) which is capable of cooperating with said first base when the connector is used to connecting another IC having a different size to the circuit board.