Electronics Forum | Tue Oct 21 21:34:56 EDT 2014 | davef
"Electroless Nickel Immersion Gold and Black Tar. What Is It and How Can It Be Prevented?" James Trainor, OM Group Electronic Chemicals, LLC SMTAI 2014 SUB2
Electronics Forum | Mon Oct 20 21:26:57 EDT 2014 | richardciccarone
I have seen a couple of references to Black Tar, Not Black Pad. Apparently, it occurs only on the solder side of PTH's after wave solder and primarily on the edges of the land. It is characterized by a black coloration (Not Ni corrosion?) and non-wet
Electronics Forum | Tue Oct 21 22:25:35 EDT 2014 | richardciccarone
Thanks for the input. I read that paper. I'm not convinced the Pb stabilizer and bath MTO's are a cause of the Black Tar defect. If that were the case, given the history of Pb stabilizers and ENIG, I would have thought that there would have been many
Electronics Forum | Fri Sep 05 13:49:04 EDT 2008 | gregoryyork
Tell the board shop to increase the cure temp of the resist as it is undecured especially if you have waxy/greasy resiues on the board and a brown tar like substence in the solder wave itself. If undercured then solder will not flow off the resist pr
Electronics Forum | Sun Sep 07 15:42:36 EDT 2014 | horchak
It is a AVX TAR series. Commonly called a bullet cap and is now most likely obsolete. AVX 9915 is a date code or lot number. 15uM is the value, probably 15 micro farad but not sure.
Electronics Forum | Thu Jul 14 02:25:59 EDT 2016 | salini
Thanks Evtimav and davef... We are doing tar potting only over the moisture sensitive device (not all over the PCB) to make sure that it does not get effected by moisture. But am unable to test the reliability of the process. Continuous switching or
Electronics Forum | Wed Mar 11 18:28:03 EDT 2015 | gregoryyork
Hi its undercured solder resist which leaves a clear waxy/oily residue and can be seen as brown tar/oil in the molten solder wave. This also causes MicroSolder Balling and some snail trails of solder pick up and worst case bridging and peeling resist
Electronics Forum | Fri Jul 15 12:02:45 EDT 2016 | davef
This conversation is making my head hurt. Before your engineers respin the design, some basic questions need answers. * How do you know that the field failures were caused by MSD damage? * What is going on in the field that is causing these failure
Electronics Forum | Wed May 02 12:07:00 EDT 2001 | mparker
I was a bit amused the way you "tanked" that dip John. I mean you skewered him without benefit of remoulade, that puppy was tarred and feathered, chopped, chromed, toasted!!! I was a bit surprised that you chose to get back into the thread, it didn't
Electronics Forum | Mon Nov 30 23:45:20 EST 1998 | Kallol Chakraborty
Hi folks , Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Our inspection /te
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