Patent ID: 6168973
Filing Date: 2001-01-02
Classification: H01L

Abstract:
A method for stacking semiconductor die, the method comprising: providing a first semiconductor die including a plurality of first die bond pads; providing a first mounting substrate including a first side and a second side, wherein the first mounting substrate includes one or more first conductive traces for electrical connection to one or more of the plurality of first die bond pads, wherein one or more of the first conductive traces terminate at conductive pad regions at the second side of the first mounting substrate, wherein the first semiconductor die is adjacent the first side of the first mounting substrate; providing a second semiconductor die including a plurality of second die bond pads; providing a second mounting substrate including a first side and a second side, wherein the second mounting substrate includes one or more conductive vias therethrough, one or more conductive traces on a first side of the second mounting substrate for electrical connection to the conductive vias, and one or more conductive traces on the second side of the second mounting substrate for electrical connection to one or more of the plurality of second die bond pads, and wherein one or more of the conductive traces on the first side of the second mounting substrate terminate at conductive pad regions, wherein the second semiconductor die is adjacent the first side of the second mounting substrate; attaching a plurality of solder balls to a plurality of the conductive pad regions on the second side of the first mounting substrate; attaching a plurality of solder balls to a plurality of the conductive pad regions on the first side of the second mounting substrate; and forming a plurality of substantially columnar solder connections, each columnar solder connection formed from a solder ball attached to a conductive pad region on the second side of the first mounting substrate and a corresponding solder ball attached to a conductive pad region on the first side of the second mounting substrate.