Patent ID: 8216930
Filing Date: 2012-07-10
Classification: H01L

Abstract:
1. A method for forming flip chip interconnection, comprising: providing a substrate having an interconnect site on a conductive trace formed on a die attach surface; providing a semiconductor die having an interconnect pad formed on an active surface; depositing fusible conductive material on the interconnect pad or on the interconnect site; positioning the semiconductor die with the active side of the die oriented toward the die attach surface of the substrate, the fusible conductive material contacting the interconnect pad and interconnect site; and melting and then re-solidifying the fusible conductive material to form a metallurgical interconnection between the interconnect pad and interconnect site, wherein a width of the metallurgical interconnect across the interconnect site is less than a length of the metallurgical interconnect along the interconnect site and a width of the metallurgical interconnect across the interconnect pad is about 1.5 to 4 times the width of the metallurgical interconnect across the interconnect site.