US Patent 7220989 Test apparatus for a semiconductor package

A test apparatus for a semiconductor package which has at least one chip and a plurality of solder balls includes a socket body, a circuit substrate, and a socket lid. The socket body has a plurality of traces electrically connected to an exterior electric test apparatus. The circuit substrate is disposed in the socket body for supporting the semiconductor package and has a plurality of metal extension traces for connecting the solder balls of the semiconductor to the traces of the socket body. The socket lid has a platform body and a soft pad, wherein the platform body presses the semiconductor package and the soft pad is disposed between the platform body and the semiconductor package.