Electronics Forum | Sat Mar 06 02:54:25 EST 2004 | tommy
1)Solder paste selection 2)Reflow profile.Focus on soaking and TAL. 3)Moisture control for BGA. 4)Maybe the BGA solder ball already with void. 5)PCB design.Any via on bga land? 6)Solder masking type. 7)Solder paste volume apply on land. 8)IPC class 3
Electronics Forum | Fri Feb 03 13:17:10 EST 2006 | amol_kane
also as an aside, make sure that the Imm Ag boards are stored in sealed bags with silver saver paper between 20-25 deg C and 40-50 % RH
Electronics Forum | Tue Nov 27 10:16:07 EST 2001 | davef
Oooo, I get it. We do that trick on the wave solder side of boards. On the bare board, during design / layout, the basic shape of the jumper is a 125 thou disc of copper [that of course is eventually covered with whatever solderability preservative
Electronics Forum | Tue Jan 03 17:38:38 EST 2012 | davef
Here's two ideas fro the fine SMTnet Archives: * On the bare board, during design / layout, the basic shape of the jumper is a 125 thou disc of copper [that of course is eventually covered with whatever solderability preservative we use on the board]
Electronics Forum | Tue Dec 08 16:53:41 EST 1998 | Ryan Jennens
Hey there Dave! We used to use a batch cleaner when we used water-clean paste. It was similar to a dishwasher, except that it had a digital menu for entering the number of wash cycles, water temp., amount of saponifier (we just used DI water),
Electronics Forum | Thu Sep 09 11:30:03 EDT 2004 | Tim Lawrence
Hi I came across this article while writing a paper. I don't know if it's the first, but it is early wave soldering: W L Oates, "Automatic Soldering Machines for Printed Circuit Board Assemblies", IRE National Convesntion Record, Vol. 6, No. 6, pa
Electronics Forum | Tue Dec 08 18:40:04 EST 1998 | Graham Naisbitt
Hi all, Only observation I would make is that it depends upon what you term as clean? Now isn't that an old thorny question. Care to comment? Regards Graham | Hey there Dave! | | We used to use a batch cleaner when we used water-clean paste.
Electronics Forum | Wed Dec 09 21:45:11 EST 1998 | Dave F
Graham: I agree. Very thorny. What is clean?? And how is that controlled?? Back 25 or so years ago, soldering was done with high solids rosin fluxes. The issue with cleanliness was ionic contamination. The US military and others set a fairly a
Electronics Forum | Thu Apr 03 11:17:17 EST 2003 | rdr
Well, first off now I'm just starting to believe that we are fracturing again. But here is some more input D1 ENIG? I would not have thought that they would be but as usual you are probably right. D2 Again I would have to agree about it should affe
Electronics Forum | Mon Feb 22 20:45:04 EST 1999 | Dave F
| I need some help to see if anyone knows of a vendor that makes a permanent marker that is in the Houston area that can write on a PCB the size of a grain of rice using white permanent ink...That's the amount of space we have to write our serial num
