Sn/3.5Ag, Sn/0.7Cu, Sn/3.9Ag/0.6Cu, Sn/2.0Ag/0.7Cu (for Bar, Wire, Paste, BGA & Anode); Sn/Sb (for Bar); Sn (for Bar, Wire & Anode); Ni/Pd (for Bar, BGA & Anode); Conductive Adhesive (for Paste).
Electronics Forum | Sun Oct 13 08:53:46 EDT 2002 | greenman
TI found an improvement in solderability on their Ni/Pd lead-finishes by using inert (nitrogen) reflow, but this is an expensive operation for just one part.
Electronics Forum | Thu Jun 27 21:28:42 EDT 2002 | davef
You're correct that the Ni/Pd termination seems to have something to do with you solder balling. It could be related to the interaction between your paste and the Pd. I assume these are really 'fines' rather than 'balls'. Things that come to mind a
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This paper summarizes the results of recent investigations to examine the effect of electroless nickel process variations with respect to Pb-free (Sn-3.0Ag-0.5Cu) solder connections. These investigations included both ENIG and NiPd as surface finishes intended for second level interconnects in BGA applications. Process variations that are suspected to weaken solder joint reliability, including treatment time and pH, were used to achieve differences in nickel layer composition. Immersion gold deposits were also varied, but were directly dependent upon the plated nickel characteristics. In contrast to gold, different electroless palladium thicknesses were independently achieved by treatment time adjustments.
SMTnet Express, November 6, 2014, Subscribers: 23500, Members: Companies: 14091, Users: 37109 Effect of Process Variations on Solder Joint Reliability for Nickel-based Surface Finishes Hugh Roberts, Sven Lamprecht, Gustavo Ramos, Christian Sebald
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