Electrical connector

摘要

An electrical connector for electrically connecting a chip module to a circuit board comprises a dielectric base, a dielectric cover, a number of contacts and a positioning member. Each contact comprises a contact portion received in the base and a joining portion extending into the positioning member. The positioning member has a number of guiding holes and a number of conical receiving recesses having solder balls deposited therein. The guiding holes of the positioning member snugly receive the joining portions of the corresponding contacts thereby preventing molten solder from flowing into the base. The positioning member may be made of the same dielectric material as the mating circuit board thereby eliminating different thermal expansion between top and bottom surfaces of the solder balls due to a difference in coefficients of thermal expansion between the electrical connector and the mating circuit board.