Silver flashing process on semiconductor leadframes

Details Silver flashing process on semiconductor leadframes Silver flashing process on semiconductor leadframes

1988-03-21

1989-11-28

Hearn, Brian E.

Fishing, trapping, and vermin destroying

437210, 437245, 428647, 428936, 427098, H01L 2144

Patent

active

048837741

ABSTRACT:
A process for flashing a thin layer of silver on metal leadframes using no mask steps and a minimal amount of silver. An unmasked metal leadframe is placed into a cleaning bath that includes silver in solution and has no outside electrical driving force to assist plating. The leadframe is removed from the cleaning bath once a uniform silver layer having a thickness of 100 to 1000 angstroms is plated thereon. The silver layer need not be exact and, therefore, it is not critical that the period of time the leadframe remains in the cleaning bath be exact.

REFERENCES:
patent: 3893949 (1975-07-01), Sakai et al.
patent: 4214364 (1980-07-01), St. Louis et al.
patent: 4716081 (1987-12-01), Ehrreich
patent: 4756467 (1988-07-01), Schatzberg
patent: 4765833 (1988-08-01), Narumiya et al.

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