Patent ID: 7893523
Filing Date: 2011-02-22
Classification: H01L

Abstract:
1. A solder bump based microarray package, comprising: a leadframe having a plurality of contact pads; a die carried by the leadframe; a plurality of bonding wires that electrically connect the die to the leadframe; an encapsulant that encapsulates the die, the bonding wires and the leadframe while leaving said plurality of contact pads exposed and substantially co-planar with a bottom surface of the microarray package; a plurality of pedestal members composed of substantially the same material as the contact pads, each pedestal member being plated to an associated one of said plurality of contact pads and protruding outwardly beyond the bottom surface of the microarray package by a first height, each said pedestal member comprising a distal surface and sidewalls; and a plurality of solder bumps, each solder bump being formed over the distal surface and the sidewalls of an associated one of said pedestal members such that none of said associated pedestal member is exposed to the outside of the microarray package, wherein said first height is sufficient to shift a stress concentration point of its respective solder bump to contact pad interface axially from a first plane extending along the bottom surface of the microarray package to a second plane that is axially displaced from the bottom surface of the microarray package.