Electronics Forum: double and reflow and qfp (Page 2 of 5)

Immersion gold and BGAs

Electronics Forum | Fri Aug 26 09:57:21 EDT 2005 | russ

The Immersion gold is not a problem with BGAs specifically but "black pad" which can be present anywhere. The unfortunate thing with BGAs is you cannot see it. Personally I hate white tin. It is okay for single sided boards running no-clean, but c

BGA ball and PCB pad

Electronics Forum | Wed Feb 18 12:42:43 EST 2004 | babe

OK, if the sphere of the ball and the paste on the pad are both eutectic, 63/37 then the paste will reflow first causing a drop of the component, after which the spheres will reflow causing a double drop and a good intermettalic. You can see this by

Water cleaning and Moisture Entrapment

Electronics Forum | Wed Dec 24 11:23:22 EST 2008 | childs

I can't seem to locate any information/concerns about moisture entrapment in IC packages on the promary side in a double sided SMT assembly using water soluable solder paste when soldering the second side. A typical process would assemble/reflow/cle

Re: BGAs and vapor phase

Electronics Forum | Mon Jul 19 12:37:15 EDT 1999 | Wolfgang Busko

Hi, SMTASSY that�s what we do, soldering our double-sided-finepitch-BGA-and all-the-other-stuff-boards in vapourphase because it�s the only thing we have. First, we do not do real series produktion, only prototyping up to som

J-STD-002 and -003 solderability testing...

Electronics Forum | Sat Jun 30 11:03:29 EDT 2001 | davef

Nice to have you back on SMTnet. Some of the newer folk have missed-out on the solid contributions you�ve made to the Forum. The chicken wire cleaning basket was a classic!!! [It�s a shame that the folk at SMTnet can�t recover those files.] We bu

Re: BGAs and vapor phase

Electronics Forum | Tue Jul 20 05:29:14 EDT 1999 | Wolfgang Busko

Hi, SMTASSY that�s what we do, soldering our double-sided-finepitch-BGA-and all-the-other-stuff-boards in vapourphase because it�s the only thing we have. First, we do not do real series produktion, only prototypi

Re: SMD Inspection and Touch-up

Electronics Forum | Fri Jul 23 12:49:47 EDT 1999 | Tony

There is a practise within the industry of an Inspector inspecting a board, and that same Inspector performing touch-up. My opinion is that the Inspection and Touch-up operations should be separate functions whereby the Inspector is not performing

Cracking Capacitors and Solder Balls

Electronics Forum | Mon Jun 08 14:19:30 EDT 1998 | Gary Simbulan

Earl, et al, Boy things get old and cold around here fast. I promised more detail on my capactior problem and I thought I could drop something completely different in the same message and tell a tale of solder balls. First the caps. We still have

PLCC 44 and QFP 240 tilting problems

Electronics Forum | Tue Feb 20 18:04:53 EST 2007 | coop

I am not familiar with the YV100XG pick & place but you might want to increase the mount height of these components The double stick tape isn't as thick solder paste. it might be pushing the component too far down causing it to twist. I encountered

kapton dots and liquid solder mask

Electronics Forum | Tue Aug 09 13:25:24 EDT 2005 | pr

From what I can gather, the annular rings are used for grounding when these boards are put in housings. A screw goes through the hole and is torqued down. If there is excess solder on the annular ring, the screw doesn't seat properly. The pallets cov


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