Stock material or miscellaneous articles – All metal or with adjacent metals – Foil or filament smaller than 6 mils
Patent
1991-07-12
1994-11-15
Fuller, Benjamin R.
Stock material or miscellaneous articles
All metal or with adjacent metals
Foil or filament smaller than 6 mils
428670, 428672, B32B 1501, B21C 3704
Patent
active
053647068
ABSTRACT:
A clad bonding wire for electrically connecting the bonding pad of a semiconductor device to an external lead comprises a core wire formed on one of high-purity Pd or a Pd alloy, high-purity Au or a Au alloy, high-purity Pt or a Pt alloy, and high-purity Ag or a Ag alloy, and a cladding cladding the core wire and formed of another one of the foregoing materials other than that forming the core wire. The wire-to-cladding diameter ratio D.sub.2 /D.sub.1 is in the range of 15% to 60% or 85% to 99. When the tip of the clad bonding wire is heated to form a ball, part of the core wire and part of the cladding in a neck formed behind the ball diffuse into each other to form an alloy of the materials forming the core wire and the cladding between the core wire and the cladding to enhance the mechanical strength of the neck beyond that of other portion of the clad bonding wire.
REFERENCES:
patent: 2303497 (1942-12-01), Reeve
patent: 4752442 (1988-06-01), Asada et al.
E. M. Wise, "The Platinum Metals", 1953, p. 291.
Iga Hiroto
Kujiraoka Takeshi
Murakami Kensei
Nagamatsu Ichiro
Shirakawa Shinji
Fuller Benjamin R.
Lund Valerie
Tanaka Denshi Kogyo Kabushiki Kaisha
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