Electronics Forum | Fri Feb 01 19:07:57 EST 2013 | hegemon
We have had some success in void reduction with LGA by pre-tinning or "bumping" the devices before placement. The extra solder seems to allow a slightly higher standoff, and allows better outgassing, is my guess. A lot more labor , but the results
Electronics Forum | Wed Dec 27 21:12:30 EST 2000 | Dave F
From a process perspective, I don�t know if you should be concerned ... You've told us nothing about your process. THE BOOK JEDEC MO-51 allows 6 thou warp in smaller [1mm pitch] BGA and 8 thou in larger [ 1.27mm and 1.5mm pitch] BGA. The increase
Electronics Forum | Sat Aug 05 09:22:34 EDT 2000 | Dave F
Stencil, Step Down. A stencil of varying thickness that allows printing different amounts of solder paste or adhesive. Most stencil suppliers make stepped stencils Step stencils are used when there are fine pitched device amoung coarse pitched dev
Electronics Forum | Thu May 18 13:08:33 EDT 2000 | Wolfgang Busko
Chris, one question, which standard allows to put it in the drawings/dokumention? As I said in my old IPC-D-275 it says "no". Did it change with the new edition ? Referring to J-STD-001 in this case seems to me like "I followed only the orders and do
Electronics Forum | Fri Dec 17 06:11:33 EST 1999 | Christopher Lampron
Henry, TNT makes some good points. I have also found that the use of a 2% silver solder paste (provided that it's allowable) can help reduce the occurance. You may want to run a thermal profile on the PCB is question. Is the board thermaly equalized
Electronics Forum | Tue Dec 21 19:57:45 EST 1999 | Russ
All of the information so far has been great, I would like to add one more thing to the puzzle. We have utilized a "homeplate" aperture on the stencil when the pad geometry or PCB design prohibits all of the above mentioned remedies. The hompeplat
Electronics Forum | Fri Dec 10 08:58:15 EST 1999 | Boca
Allow me a disagreeable moment here. 'Bad boys..' is memorable (learned it in high school), and that is the point of using a memory device is it not? Its purpose is not cultural training, moral instruction, or a life plan it is just a memory devic
Electronics Forum | Wed Apr 21 15:27:24 EDT 1999 | Murray Pulman
Hi Scotty sorry to stir things up but we assemble some seriously high value boards on a contract basis with vias through bga pads. However, not blind vias, so there are no cleaning issues & we use 6 though stencils to provide a little extra paste t
Electronics Forum | Wed Oct 07 08:47:11 EDT 1998 | Clifford Peaslee
We are considering a new free service here at smtnet, Web Email. This would allow users to keep their personal email address's private, while we make users use the smtnet address when there are required email fields in forms. When a user registers on
Electronics Forum | Tue Oct 13 12:29:46 EDT 1998 | smd
Basic text tags like etc would allow one to make certain lines or words stand out for greater emphasis. Tags like would allow one to organize the lines and words. Tags like and the like would enable one to organize information into a useful char
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