Abstract

With all the advances in 2.5D and 3D packaging, wire bonding is still the most popular interconnect technology and the workhorse of the industry. Wire bonding technology has been the lower cost solution comparing to flip chip. Wire bonding package cost is much reduced with the introduction of Copper wire bonding. Technology development and innovation in wire bonding provides new packaging solutions that improves performance and reduces cost. This paper reviews the recent innovations in ball bonding technology to provide optimized ball bonding solutions targeted for different bonding wire material. It examines the different challenges for the alternative wire types including Cu wire, Pd coated, and AuPd coated Cu wire and Ag Alloy wire. We will discuss key development in ball bonding equipment, process and material to overcome the challenges and provide robust low cost solutions. The advantages of each wire type are outlined, and guidelines to select the right bonding wire type per application requirements are provided.

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