Patent ID: 6116922
Filing Date: 2000-09-12
Classification: H01R,H05K,Y02P

Abstract:
An electrical connector for engaging an electrical device and a circuit board having a plurality of contact pads thereon for transferring electrical signals therebetween, the connector comprising:an insulative housing having a mating surface and a mounting surface on opposite faces thereof and a plurality of cavities between the mating surface and the mounting surface, the housing defining a recessed surface recessing from the mounting surface toward the mating surface along outermost edges of the mounting surface;a plurality of contacts received in the cavities of the housing, each contact having a mating portion adapted for engaging with the electrical device and a mounting portion solderably engaging with the contact pad of the circuit board via a first solder ball below the mounting portion; andmeans for relieving stress caused between the mounting portions of the contacts and the contact pads of the circuit board due to the housing and the circuit board each having a different coefficient of thermal expansion after a change of temperature, said stress relieving means comprising a plurality of second solder balls, each of said second solder balls being larger than the first solder ball, the second solder balls being located on the recessed surface of the housing so that the first and the second solder balls may be coplanarly mounted on the circuit board.