Colored conductive wires for a semiconductor package

Active solid-state devices (e.g. – transistors – solid-state diode – Combined with electrical contact or lead – Ball or nail head type contact – lead – or bond

Reexamination Certificate

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C257S780000, C257S782000, C257SE21509, C257SE23067

Reexamination Certificate

active

07145251

ABSTRACT:
The surface of a solder ball and a conductive wire for a semiconductor package are coated with a predetermined colorant. Various colorants may be used according to the diameter and metal composition of the solder ball and the conductive wire. The colorant is formed by mixing organic compound and dye of a predetermined color. Examples of organic compounds excellent in physicochemical bonding with metal include benzotriazole, alkylimidazole and benzimidazole. The solder ball is fabricated by coating an organic compound of a predetermined color on the surface of a typical solder ball. The conductive wire is fabricated by coating an organic compound of a predetermined color on a general conductive wire between heat process and winding. Moreover, the solder ball is evaporated in a reflowing step after bumped via flux and the conductive wire is evaporated in a wire bonding step so that the solder ball and the conductive wire return to their unique colors.

REFERENCES:
patent: 3989605 (1976-11-01), Yanagida et al.
patent: 6136434 (2000-10-01), Jang et al.
patent: 2004/0164413 (2004-08-01), Hall et al.

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