Electronics Forum | Thu May 20 15:47:49 EDT 2010 | mikesewell
What is the area ratio for the aperture? What size paste are you using? Stencil thickness & aperture size?
Electronics Forum | Mon Jul 30 18:52:43 EDT 2001 | Brian W.
You did not provide the stencil thickness or your aspect ratio. If your aspect ratio (Aperture width/stencil thickness) is less than 1.5, the paste will not release correctly from the aperture, leaving paste in the aperture. For example, if your pa
Electronics Forum | Tue Aug 24 10:58:26 EDT 1999 | James Graves
Does anyone have any information on stencil aperture/pad ratios for noclean solder paste. In the past I have experienced severe solder ball problems when using the same size apertures from aqueous products as I do with the No-clean products. Conseq
Electronics Forum | Wed Feb 09 14:23:41 EST 2005 | russ
First off how thick is your stencil going to be? I have printed .5mm pitch with .009" apertures with a 6 mil stencil. A 5 mil would have been better but the 6 worked just fine. Pitch is not necessarily the deciding factor for paste type. it is the
Electronics Forum | Fri May 20 08:04:30 EDT 2016 | milroy
Hi All I have a need to calculate the Aperture area in a stencil with in a very short time without going in to a CAD viewer. I need that when I insert solder paste file in to a certain software application and that application software calculate the
Electronics Forum | Fri Jul 07 13:37:46 EDT 2023 | davef
Use the volume of paste of your circular aperture as the starting point. Calculate: Volume = pi X (aperture diameter^2 / 4) X stencil thickness Determine the sides of your square aperture using the volume of paste that you calculated and the stencil
Electronics Forum | Thu May 30 09:14:03 EDT 2013 | emeto
I have another idea. Would you check the apertures on the stencil? May be they didn't cut the right size apertures there. If you have smaller aperture you can't get the right amount of paste.
Electronics Forum | Mon Sep 23 02:54:40 EDT 2013 | pradeep_selec
We are using Dpak package & I would like to know which is the best Aperture shape for DPAK, whether is there any problem if the Aperture of Ground pad is made of the same shape & size as the pad & what are the possible issues faced with it. Can I hav
Electronics Forum | Wed Aug 07 12:41:58 EDT 2019 | slthomas
Are the apertures on the stencil reduced in width or 1:1 with the pads? It depends on the pad width and foil thickness but we usually reduce aperture width for any part that results in an aperture wall spacing of less than 8.5 mils.
Electronics Forum | Thu Apr 30 23:28:17 EDT 2020 | SMTA-Davandran
Do considering AR and 5 balls rule during designing stencil aperture. it give better paste release. Aperture redesigning need to look into symptom that we are seeing on AOI. It will be given us idea hows to improve aperture design to improve SMT firs