Patent ID: 9196559
Filing Date: 2015-11-24
Classification: H01L

Abstract:
1. A method comprising: forming a passivation layer over a metal pad, wherein the metal pad is further overlying a semiconductor substrate of a wafer; forming a Post-Passivation Interconnect (PPI) electrically coupled to the metal pad, wherein a portion of the PPI is overlying the passivation layer; forming a metal bump over and electrically coupled to the PPI; applying a molding compound over the metal bump and the PPI, wherein the molding compound has a glass transition temperature higher than about 150° C., and the glass transition temperature is an inherent property of the molding compound; applying a release film over the molding compound; pressing the release film against the molding compound; applying a thermal step on the molding compound when the release film is pressed against the molding compound; removing the release film from the molding compound; after the removing the release film, removing a residue of the molding compound from the metal bump using plasma bombardment; and sawing the wafer into dies using a blade, wherein the blade cuts through the molding compound.