Patent ID: 6051887
Filing Date: 2000-04-18
Classification: H01L

Abstract:
A semiconductor stacked device for use in an implantable medical apparatus, the semiconductor stacked device comprising:a first semiconductor die including a plurality of first die bond pads;a first mounting substrate including one or more conductive traces on one side of the first mounting substrate for electrical connection to one or more of the plurality of first die bond pads;a second semiconductor die including a plurality of second die bond pads;a second mounting substrate including one or more conductive vias therethrough, one or more conductive traces on a first side of the second mounting substrate for use in electrically connecting the first mounting substrate to the second mounting substrate, and one or more conductive traces on a second side of the second mounting substrate for electrical connection to one or more of the plurality of second die bond pads;a plurality of substantially columnar solder ball connections formed from two solder balls one on top of the other attached to said first mounting substrate and said second mounting substrate; andsaid plurality of substantially columnar solder ball connections electrically connecting the conductive traces on the one side of the first mounting substrate to the conductive traces on the first side of the second mounting substrate, wherein the second semiconductor die is located between the first mounting substrate and the second mounting substrate.