Patent ID: 8637391
Filing Date: 2014-01-28
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor chip assembly comprising a die with an integrated circuit formed thereon comprising a plurality of die-pads, and a substrate comprising a plurality of substrate-pads said method comprising: (i) forming conductive columns extending from said die-pads, at least two of said columns having different volumes, said conductive columns having equal height, each one of said columns formed substantially of a conductive reflowable material and having a substantially uniform cross-section, prior to reflowing; (ii) attaching each of said columns of equal height directly to a corresponding one of said substrate-pads to form a subassembly prior to reflowing said columns; and (iii) reflowing said columns of equal height to form solder balls of varying volume to form electrical and mechanical connections between said die-pads and said substrate-pads.