Patent ID: 6555460
Filing Date: 2003-04-29
Classification: H01L

Abstract:
A method of forming portions of circuits connected to portions of integrated circuitry of a flip-chip semiconductor substrate, said method comprising:forming a semiconductor substrate having integrated circuitry, having at least one surface and having at least one circuit on a portion of said at least one surface of said semiconductor substrate connected to a portion of said integrated circuitry and terminating in a bond pad, said at least one circuit having a portion thereof covered by at least one first passivation layer while said bond pad remains substantially free of said at least one first passivation layer; forming a trace of solder wettable material from said bond pad of said at least one circuit to another location on said at least one surface of said semiconductor substrate, said trace of said solder wettable material contacting at least a portion of said bond pad of said at least one circuit and extending over a portion of said at least one first passivation layer, said trace of said solder wettable material having a first surface and a second surface, a portion of said second surface contacting said portion of said bond pad; forming at least one second passivation layer over said portion of said at least one surface of said semiconductor substrate and said trace of said solder wettable material; and etching a sloped-wall via through said at least one second passivation layer extending to a portion of said first surface of said trace of solder wettable material at said another location on said at least one surface of said semiconductor substrate.