Fishing – trapping – and vermin destroying
Patent
1991-07-12
1992-08-11
Hearn, Brian E.
Fishing, trapping, and vermin destroying
437189, 437203, 437228, 148DIG143, H01L 2144
Patent
active
051378450
ABSTRACT:
A method of forming metal contact terminals (35) of a determined size having an insulating substrate (17) with a metal land (18) formed thereon and a passivating layer (19) provided with an opening exposing a part of the metal land by forming intermediate metal contact pad (33') in the contact opening, applying and patterning a photoresist, delineating the intermediate metal contact pad (33') using pattern (31) as an in-situ mask, depositing a lead-tin solder layer (34') over a metal mask to form a solder bump (34') on the final metal contact pad, and reflowing the solder to form a solder ball (34). Thereby achieving the metal contact terminal (35) at the contact pad site. The above method has applicability to the fabrication of contact terminals for high density/high count I/O connections for advanced semiconductor chips that are appropriate for flip-chip (C4) or face-down bonding thereof on metallized ceramic (MC) substrates.
REFERENCES:
patent: 4113578 (1978-09-01), Del Monte
patent: 4427715 (1984-01-01), Harris
Lochon Henri
Robert Georges
Hearn Brian E.
Holtzman Laura
International Business Machines - Corporation
Peterson Jr. Charles W.
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