Patent ID: 9219052
Filing Date: 2015-12-22
Classification: H01L

Abstract:
1. A method of making a flip chip assembly comprising: forming a plurality of laterally spaced apart, longitudinally extending bond fingers on a top surface of an organic substrate; and applying a transversely extending solder resist strip over first end portions of the plurality of bond fingers, the solder resist strip having an edge wall comprising a plurality of tooth portions separated by gaps, with each tooth portion and each gap aligned with a different one of the bond fingers in each adjacent pair of bond fingers applying a layer of nonconductive paste to an area of the solder resist layer that excludes the tooth portions thereof; positioning a plurality of solder tipped copper pillar connectors on a flip chip die over the plurality of longitudinally extending bond fingers on the surface of the substrate; moving the flip chip die into contact with the layer of nonconductive paste; and using thermal compressive bonding to attach the solder tipped copper pillar connectors to the bond fingers.