Circuit structure with non-migrating silver contacts

Details Circuit structure with non-migrating silver contacts Circuit structure with non-migrating silver contacts

1994-09-27

1996-05-07

Thomas, Laura

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

174261, 361767, 361771, H05K 109

Patent

active

055148387

ABSTRACT:
An integrated circuit assembly that prevents silver migration by providing conductive rims around oxidizable silver contacts that contact a substrate. Typically the silver contacts are supported by respective metal pads on the substrate with a contact potential existing at each contact-pad junction. In many applications an electrical circuit transmits electrical signals via the contacts to produce potential differences between the contacts and create electrical fields at their surfaces. The conductive rims have a work function that is sufficiently small to reduce the electric fields and contact potentials so as to inhibit the ionization of the oxidized contacts' surfaces and prevent silver migration across the metal pads and the substrate.

REFERENCES:
patent: 3617695 (1971-11-01), Meyer et al.
patent: 3621442 (1971-11-01), Racht et al.
patent: 3676741 (1972-07-01), Forst et al.
patent: 4544802 (1985-10-01), Siden
patent: 4914814 (1990-04-01), Behun et al.
"Hybrid Microcircuit Technology Handbook" by James J. Licari and Leonard R. Enlow, Noyes Publications, pp. 102-106 (1988).

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