Electronics Forum | Tue Feb 03 16:42:50 EST 2009 | cuperpeter
Hello All, > > I have a problem with nonwetting Au > finish after second cycle of reflow soldering > doublesided boards. Solder nonwetted pcb pads (is > wicked to component terminations) Either these > pads or some of non component pads became
Electronics Forum | Fri Jul 11 08:17:22 EDT 2008 | aj
Hi Dave, Yes that is correct. I had a XRF carried out on some boards that I am having solderability issues on and the report came back with 0.04um - 0.05um as the measured gold thickness. Previous batches that went through fine measured 0.07-0.11u
Electronics Forum | Fri Feb 16 08:28:50 EST 2007 | pavel_murtishev
Good afternoon, Typical plating thickness for immersion tin is 0.6-1.0um. I do not know what the maximal thickness is. But plating is self-limiting process and I believe maximal thickness should be about 2-3um. BR, Pavel
Electronics Forum | Fri Sep 17 13:51:43 EDT 2004 | huib
We know from experiments that the structure of Sn can be manipulatedby means revese pulse-plating. This means alayer with less pits and thus a lower mminimum thickness is needed. www.ppcs.nu
Electronics Forum | Fri Feb 16 18:08:33 EST 2007 | davef
IPC-4554 Specification for Immersion Tin Plating for Printed Circuit Boards
Electronics Forum | Tue Aug 17 13:24:47 EDT 2004 | blnorman
We have parts that have electroplated tin over nickel. The mfg. assures us the minimum thickness of the tin is 5 microns. Cross sections have shown many instances of 1 micron and pits that go down to the nickel barrier layer. A request for thicker
Electronics Forum | Sun Jan 25 17:40:16 EST 2009 | cuperpeter
Hello All, I have a problem with nonwetting Au finish after second cycle of reflow soldering doublesided boards. Solder nonwetted pcb pads (is wicked to component terminations) Either these pads or some of non component pads became discoloured from
Electronics Forum | Thu Jul 10 22:19:14 EDT 2008 | davef
Search the fine SMTnet Archives to find threads like: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=33661
Electronics Forum | Fri Jul 11 02:42:40 EDT 2008 | aj
Thanks Dave, IPC-6012 states min at 0.05um. Has this been a update or is it for a different class? thanks, aj...
Electronics Forum | Fri Jul 11 07:04:26 EDT 2008 | davef
2 uinch, right? Here is the revision level for IPC documents: http://www.ipc.org/4.0_knowledge/4.1_Standards/revstat1.htm
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