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Dispensable 3D Electrical Interconnects - A Near TSV Back End Packaging Solution
Keywords: 3D Interconnects, TSV alternative, conductive fluids
As packaging densities increase, lead by the requirements of smaller footprints, higher storage capacity, and multi-functional 3D die structures, traditional wire-bonding techniques become inadequate and TSV is not a cost-effective solution for packaging houses. This paper discusses the benefits of dispensing the electrical interconnects instead of using traditional wire bond or high cost TSV processes. Dispensing electrical interconnects allow form factors for stacked packages to reach near TSV dimensions. Offsets to expose die pads are typically <150m and in some cases totally vertical structures can be achieved. Material selection will vary according to pitch and electrical requirements. Methods for applying the different materials will be discussed as well as material selection criteria. The progression from large pitch applications of >300m down to fine pitch applications of <100m will be shown. Data will be presented stating the benefits for each material set and how the use of any of these dispensable electrically conductive fluids can be implemented into typical back end packaging houses using equipment that in most cases are already installed. The non-contact nature of the dispensable electrical interconnect process allows for thinner die to be stacked without fear of cracking the stacked die. Furthermore, the entire die stacking process can be executed in a single step minimizing overall material handling and repetitive die stack processes that induce die crack and expensive yield losses.
Jeff Leal, Principal Engineer
Vertical Circuits
Scotts Valley, CA

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