Patent ID: 7838335
Filing Date: 2010-11-23
Classification: H01L,H05K,Y02P

Abstract:
1. A manufacturing method of a semiconductor device, comprising the steps of: forming a semiconductor package including a chip mounted on a substrate electrically connected with the chip and having electrodes; molding a mold resin having fillers and a mold release agent of at least one of a silicon oil, wax or fatty acid to seal the chip, wires and electrodes; forming solder balls at the electrodes along an under surface of the substrate to form a semiconductor package with a mold resin that has a ball face side; exposing the ball face side of the semiconductor package to sputtering by an Ar plasma to remove the release agent on the ball face side; applying a flux to the ball face side of the semiconductor package; attaching solder ball connections to an undersurface of a bare chip; providing a wiring substrate with a plurality of solder balls on which the semiconductor package and the bare chip are to be mounted; performing flip chip mounting of the semiconductor package and bare chip on the wiring substrate; performing reflow to attach the solder balls of the semiconductor package and bare chip to the wiring substrate, respectively; and under-filling the semiconductor package and the bare chip with respect to the wiring substrate.