Patent ID: 6992496

Claim:
An apparatus for interfacing electronic packages and test equipment for the packages, comprising: a printed circuit board having first and second opposing surfaces, a plurality of vias formed in the printed circuit board in a predetermined pattern, each via having upper and lower ends and an inner diameter; a test socket overlaying and being connected to the first surface of the printed circuit board, the test socket including a first plate and a second plate overlaying the first plate, each of the first and second plates including a plurality of bores corresponding to the vias in the printed circuit hoard; a conductive sleeve member positioned in each via, the sleeve member having an upper end and a lower end; a biasing member seated against the lower end of the conductive sleeve member, the biasing member having an outer diameter less than an inner diameter of the conductive sleeve member and being moveable in the conductive sleeve member; and a plunger having a substantially cylindrical body, the body including outwardly extending annular flange, the plunger further including a first rod portion extending upwardly from the body and a second rod portion depending downwardly from the body, the first rod portion including an upper surface defining a selected contact portion, the first rod portion being at least partially received in the conductive sleeve member and resting against the biasing member, the body being received in the bore of the second plate, and the second rod portion being at least partially received in the bore of the first plate; wherein, when the apparatus is in an operating position, the plunger is urged upwardly to make electrical contact with a package terminal.