Patent ID: 6808959
Filing Date: 2004-10-26
Classification: H01L,H05K,Y02P

Abstract:
A method of manufacturing a semiconductor device comprising:preparing a semiconductor element; preparing a wiring substrate, the wiring substrate having a first surface on which the semiconductor element is to be mounted and a second surface opposite to the first surface, wherein a plurality of conductive land portions are exposed respectively via openings of an insulating material portion of the second surface of the wiring substrate; mounting the semiconductor element on the first surface of the wiring substrate; forming a plurality of reinforcement resin film portions on the second surface of the wiring substrate, each of the reinforcement resin film portions having an opening, each of the reinforcement resin film portions partially overlapping a corresponding one of the conductive land portions, and a portion of each of the conductive land portions being exposed by the opening of the corresponding one of the reinforcement resin film portions; disposing solder balls respectively on the conductive land portions which are exposed by openings of the reinforcement resin film portions, and heating and melting the solder balls, the portions of the reinforcement resin film portions which overlap the conductive land portions being pushed away from the conductive land portions, a surface of each of the solder balls substantially parallel to the second surface of the wiring substrate being a first distance from a conductive land portion on which the solder ball is disposed and the reinforcement resin film portion corresponding to the conductive land portion being a minimum second distance from the conductive land portion, the first distance being less than the minimum second distance; and cooling and curing the melted solder balls.