Patent ID: 6444563
Filing Date: 2002-09-03
Classification: H01L,H05K,Y02P

Abstract:
A method for making a device, the method comprising the steps of:providing a device containing electrical circuitry, the device having a first plurality of conductive contact regions having a first surface area, and the device having a second plurality of conductive contact regions having a second surface area, wherein the second surface area is substantially larger than the first surface area; attaching a first plurality of solder balls to the first plurality of conductive contact regions, each of the first plurality of solder balls having a volume X; attaching a second plurality of solder balls to the second plurality of conductive contact regions, each of the second plurality of solder balls having a volume Y that is substantially greater than the volume X; reflowing the first and second plurality of solder balls on the first and second plurality of conductive contact regions to provide a first plurality of reflowed solder balls and a second plurality of reflowed solder balls; wherein a standoff height of the first and second reflowed solder balls are substantially equal before being connected to another surface.