Electronics Forum | Wed Jan 09 19:04:48 EST 2008 | pnguyvu
5 mil thick is the max and no reduction Any question feel free give me a call @ 714-636-6211 or email me Steve@usastencils.com Regards Steve
Electronics Forum | Wed May 05 15:31:14 EDT 2021 | edhare
0.5 to 1 micron is typically too thick and can result in gold embrittlement of the solder joint. Typical IG thickness is 0.18 microns. see https://www.semlab.com/papers/gold-embrittlement-of-solder-joints/ Ed Hare
Electronics Forum | Tue May 07 08:18:12 EDT 2002 | Sir Alexandr
Almst quality of PCB with this pitch defined on used boards. Good board produses Fullmarks , look up to it , stencil parametrs isnt so critical but board material and layouts.
Electronics Forum | Thu May 09 17:22:56 EDT 2002 | davef
I have no opinion on the accuracy and repeatability tolerances you should be looking for on the vision system and the actual alignment of the stencil. I expect Cp=2 from my printer.
Electronics Forum | Mon May 09 10:03:26 EDT 2011 | markhoch
I would contact one of your solderpaste manufactuers. (i.e Indium, Alpha Metals, Kester, etc)
Electronics Forum | Thu May 19 19:28:31 EDT 2011 | Rstadem
Try Easyspheres (Kester), or Q-Pearls (Qualitek), or Alpha. They all have solder spheres in that alloy.
Electronics Forum | Tue May 24 16:44:42 EDT 2011 | ppcbs
Thanks everyone. I was having a hard time to find someone with immediate stock, reasonable price, lead time, or min order. I found some though and have extra stock now if anyone needs some.
Electronics Forum | Wed Feb 22 08:02:56 EST 2006 | dj44
I was looking for an stencil design for a 0.5mm pitch uBGA. Pad size is 0.38mm in diameter. We have been using 5mil stencil with type 3 no clean paste. What size aperture should we be using? Any suggestions?
Electronics Forum | Fri Nov 17 16:33:10 EST 2000 | Michael Parker
20X magnification, using 0.5 mil accuracy, is helpful. I have a MicroVU system for geometric measurements in my Receiving Inspection, which is used to also measure the new stencils to ensure aperture reductions requested are actually provided by the
Electronics Forum | Mon Sep 18 20:51:35 EDT 2000 | Dave F
A fairly dense brickwall would have 0.020" (0.05mm) spacing
