Patent ID: 7738258
Filing Date: 2010-06-15
Classification: H01L,H05K

Abstract:
1. A semiconductor mounting board comprising: a core substrate; a build-up layer formed over the core substrate and comprising conductor layers having a wiring pattern formed thereon and insulating layers alternately laminated; a pad set comprising a plurality of pads formed on an outermost insulating layer of the build-up layer and positioned to receive an interposer, the plurality of pads comprising a plurality of internal pads and a plurality of external pads surrounding the internal pads; and an interposer provided over the build-up layer and electrically connected to the pad set, the interposer being configured to mount an electronic component on a side of the interposer which is opposite to a side of the build-up layer, wherein the plurality of external pads is formed in an external area of the pad set, and have a substantially flat shape, wherein at least one of the core substrate and the insulating layers in the build-up layer comprise resin, and the interposer comprises ceramic and has a thickness which is set to 0.1 to 0.8 times a thickness of the semiconductor mounting board having the core substrate and the build-up layer, wherein the plurality of internal pads has a ratio of the internal pads formed as via holes with respect to a total number of the internal pads in the range of ⅓ to ⅔, and each via hole of the internal pads is filled with a conductive material, and the external pads are included in an area from a first surrounding array to an n-th surrounding array, where n is an integer from 2 to 10, with the first surrounding array being the outermost surrounding array of the pad set.