Patent ID: 9111817
Filing Date: 2015-08-18
Classification: H01L,Y10T

Abstract:
1. A bump on trace (BOT) structure, comprising: a contact element supported by an integrated circuit; an under bump metallurgy (UBM) feature electrically coupled to the contact element; a metal bump on the under bump metallurgy feature; and a substrate trace on a substrate, the substrate trace coupled to the metal bump through a solder joint, an additional metal, and intermetallic compounds, a ratio of a first cross sectional area of the intermetallic compounds to a second cross sectional area of the solder joint greater than forty percent; wherein the additional metal is interposed between the metal bump and the solder joint, wherein the additional metal comprises nickel, and wherein the solder joint completely separates intermetallic compounds adjacent the metal bump and intermetallic compounds adjacent the substrate trace.