Patent ID: 7847411

Claim:
An electronic device comprising: an electronic element; and an interposer including an interposer base to which the electronic element is joined, and a plurality of post electrodes connected to corresponding electrodes of the electronic element; wherein the electronic element and the interposer base are made of silicon and the interposer base comprises a silicon wafer piece, said interposer base being defined by an upper principal surface, a lower principal surface and a sidewall surface connecting said upper principal surface and said lower principal surface, said plurality of post electrodes extending between said upper principal surface and said lower principal surface of said interposer base so as to penetrate through the silicon wafer piece, each of said plurality of post electrodes having a top end exposed at said upper principal surface, each of said plurality of post electrodes having a bottom end exposed at said lower principal surface, said electronic element having a top principal surface in direct contact with said lower principal surface of said interposer, said electronic element carrying said plurality of electrodes respectively in correspondence to said plurality of post electrodes in a state buried in said electronic element, said plurality of electrodes being exposed at said top principal surface of said electronic element and in contact with corresponding bottom ends of said plurality of post electrodes, said plurality of electrodes forming a flush surface with said top principal surface of said electronic element, a rewiring layer being formed upon said top end of said post electrode in electrical connection therewith, an external connection terminal being formed directly on and in direct contact with a top surface of said rewiring layer; wherein the external connection terminal is a solder ball or solder bump.