Semiconductor device manufacturing: process – Coating with electrically or thermally conductive material – To form ohmic contact to semiconductive material
Reexamination Certificate
1999-08-25
2002-06-11
Lee, Eddie (Department: 2815)
Semiconductor device manufacturing: process
Coating with electrically or thermally conductive material
To form ohmic contact to semiconductive material
C438S614000, C438S617000
Reexamination Certificate
active
06403457
ABSTRACT:
BACKGROUND
This invention relates generally to coating bond pads in the fabrication of integrated circuits.
It is generally desirable to coat wire bond pads and solder ball bond pads with nickel and gold. Currently these coating processes are implemented simultaneously on both types of bond pads. Wire bond bond pads typically need more gold than solder ball bond pads. Too little gold causes wire bonding problems. Too much gold causes solder ball joint embrittlement.
As a result, in situations in which both types of bond pads are contained on the same structure, conventional processing provides either too much gold to suit the solder ball bond pads or too little gold to suit the wire bond pads. Certainly, providing excessive gold coatings is generally not cost effective.
Thus, there is a need for a better way to coat bond pads in fabricating structures with both solder ball and wire bond bond pads.
SUMMARY
In accordance with one aspect, a method of coating solder ball and wire bond pads includes masking the solder ball pads. Gold is coated on the wire bond pads with the solder ball pads masked.
Other aspects are set forth in the accompanying detailed description and claims.
REFERENCES:
patent: 4355456 (1982-10-01), Harnagel et al.
patent: 4600600 (1986-07-01), Pammer et al.
patent: 4692997 (1987-09-01), Calviello
patent: 5311404 (1994-05-01), Trask et al.
patent: 5380679 (1995-01-01), Kano
patent: 5445311 (1995-08-01), Trask et al.
patent: 6180265 (2001-01-01), Erickson
patent: 2273257 (1994-06-01), None
patent: 402220442-a (1990-09-01), None
Brock II Paul E
Lee Eddie
Trop Pruner & Hu P.C.
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