Patent ID: 6260753
Filing Date: 2001-07-17
Classification: B23K,H01L

Abstract:
A method for forming and bonding a metal bump on a metal pad of an integrated circuit, the method comprising the steps of:melting into a ball a portion of a metal wire being fed through a conduit of a capillary tool, the portion of the metal wire protruding from a concave mouth of a tip of the capillary tool;bonding the metal ball being held in the concave mouth to the metal pad of the integrated circuit to form a bonded metal bump;retracting the capillary tool from the bonded metal bump while allowing free movement of the capillary tool relative to the metal wire passing through the conduit;blocking relative movement of the metal wire and shifting laterally the capillary tool so as to break off the metal wire; andstamping a vertex of the bonded metal bump and a residual wire stump forming a substantially flat and leveled contact area by re-lowering the capillary tool.