Patent ID: 6969638
Filing Date: 2005-11-29
Classification: H01L,H05K

Abstract:
1. A method of assembling an integrated circuit (IC) device with a substrate, comprising: providing a substrate having electrical terminals on a first side of the substrate, and a copper bondpad on a second side of the substrate opposing the first side electrically coupled to at least one of the terminals; the copper bondpad being substantially free of plated gold and substantially free of solder material; mounting the IC chip to the first side of the substrate; electrically connecting the IC chip to the terminals; encapsulating the IC chip mounted on the substrate with encapsulation material at an elevated temperature, thereby oxidizing the surface of the copper bondpad; spraying an aqueous etchant on the bondpad to remove oxidized copper from the bondpad; and coating the etched bondpad with an anti-tarnish solution.