Patent ID: 6677055
Filing Date: 2004-01-13
Classification: C25D,H01L,H05K,Y10S,Y10T

Abstract:
A tape structure, comprising:a film having at least one device hole therein; a solder mask over the film; and a plurality of leads between the film and the solder mask, wherein the leads extend from the film into the interior of the device holes, the leads are made from copper and the leads further include: a tin-copper alloy layer on the surface extending beyond the junction interface between the leads and the film and in between the leads and the solder mask; a tin-copper-first metal alloy layer on the surface of the tin-copper alloy layer extending between the leads and the solder mask, wherein the first metal is selected from a group consisting of gold, magnesium, and palladium; and a metallic till layer on the surface of the tin-copper-first metal alloy layer extending beyond both the junction interface between the tin-copper-first metal alloy layer and the solder mask and the junction interface between the leads and the film.