Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2006-04-25
2006-04-25
Arbes, Carl J. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S843000, C029S874000, C029S876000
Reexamination Certificate
active
07032311
ABSTRACT:
A new and improved electrical connector is provided for Ball Grid Array (BGA) devices and Direct Chip Attach (DCA) devices that solves the prior art problems of mismatch in the coefficient of thermal between a semiconductor die and its substrate, PC board or carrier. The electrical connector consists of a resilient loop of wire that is permanently wire bonded at a first and a second bond position to an electrode or contact pad of a die or an interposer. The closed loop of wire is stable in the X and Y direction and resilient in the Z direction which enables the wire bonded die or interposer to be temporarily attached to a carrier or test board for all forms of tests as well as being removable and reworkable even after being permanently soldered in place on a substrate or PC board. Since the loop shaped connectors are resilient in X, Y and Z directions, the die or interposer may be clamped onto a PC board or substrate to provide a lead free electrical connection that does not require any underfill. The loop size may be made with highly conductive and/or plated (coated) wire in sizes from about 2.5 mils diameter up to about 30 mils using wire having a diameter of about 1.0 mils up to 5.0 mils to replace prior art balls used on pads of about 3 mils size or greater.
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Spheres, Springs, Columns And Beams by Glenn Rinne Pub. in Advanced Packaging, Jul. 2001 @ 69- 71.
Arbes Carl J.
Sowell-Aty John B.
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