Patent ID: 7291909

Claim:
A BGA type semiconductor device comprising: a substrate having a first surface and a second surface opposite the first surface; and a semiconductor chip disposed in a mounting area on the first surface of the substrate, the semiconductor chip having first terminals which are signal terminals and second terminals which are power supply or ground terminals; wherein on the first surface of said substrate are formed first pads which are signal pads electrically connected to said first terminals by first bonding wires, and second pads electrically connected to said second terminals by second bonding wires, wherein said first and second pads are located outwardly from the mounting area on the first surface, a first region of the first surface where the first pads are arranged surrounds a second region of the first surface where the second pads are arranged, and the second pads do not extend into the mounting area, wherein electrically conductive first and second through holes are formed in the substrate to be extended between the first and second surfaces, the first pads are electrically connected to the first through holes through wirings patterned on the first surface of the substrate respectively within the first region of the first surface, and the second pads are electrically connected to the second through holes respectively within the second region of the first surface, and wherein the second surface of said substrate has a second area opposite to the mounting area and a first area located outwardly from the second area thereon, in the second area is formed a second group including second bumps electrically connected to said second pads by the second through holes, in the first area is formed a first group including first bumps electrically connected to said first pads by the first through holes, and both of the first through holes and the second through holes are provided in the first area of the second surface of the substrate.