Patent ID: 8450843
Filing Date: 2013-05-28
Classification: H01L,H05K

Abstract:
1. A semiconductor device comprising a semiconductor chip and a printed wiring board having a recess in which the semiconductor chip is housed face-down, wherein: said printed wiring board comprises multiple wiring layers below a circuit surface of the semiconductor chip on which connection terminals are formed, and the multiple wiring layers include a first wiring layer for forming signal wires, a second wiring layer for forming a ground plane, and a third wiring layer for forming power wires and power BGA pads and ground BGA pads, the first wiring layer is disposed at a first height as measured from a surface of the semiconductor chip, the second wiring layer is disposed at a second height as measured from the surface of the semiconductor chip, and the third wiring layer is disposed at a third height as measured from the surface of the semiconductor chip, the first height being different from the second height and from the third height, the second height being different from the third height.