Patent ID: 6743660
Filing Date: 2004-06-01
Classification: H01L,Y10T

Abstract:
A method of making a bump on a substrate comprising:providing a substrate having a bond pad thereon; depositing an electrically conductive redistribution trace over the substrate, and wherein the electrically conductive redistribution trace is in electrical contact with the bond pad and extends a distance horizontally from the bond pad; selectively depositing a removable buffer material onto the electrically conductive redistribution trace at a location spaced a distance horizontally from the bond pad; depositing a stress buffer layer over the substrate and encapsulating the removable buffer material; removing a portion of the stress buffer layer to expose the removable buffer material; removing the removable buffer material to provide an opening in the stress buffer layer down to the electrically conductive redistribution trace; depositing an electrically conductive material into the opening in the stress buffer layer and overlying the electrically conductive redistribution trace; and reflowing the electrically conductive material to provide a bump on the substrate.