Patent attributes
An interposer mounted wiring board includes a wiring board including outermost wiring layers respectively on both surfaces thereof, the outermost wiring layers being electrically connected to each other through an inside of the board, and first and second interposers electrically connected to the outermost wiring layers on the both surfaces of the board, respectively. Each of the first and second interposers has a value of a coefficient of thermal expansion (CTE), the value being equal or close to a value of a CTE of a corresponding one of first and second electronic components to be mounted respectively on the first and second interposers. The base member of each of the interposers is preferably formed of silicon, and the base member of the wiring board is preferably formed of resin. Further, the electronic components are mounted respectively on surfaces of the interposers and thus form a semiconductor device, the surfaces being opposite to the surfaces of the interposers facing the wiring board.
