Electronics Forum | Mon Dec 18 21:17:41 EST 2006 | davef
Use the IPC calculator [free at http://www.ipc.org]
Electronics Forum | Thu Dec 14 22:28:38 EST 2006 | Tony
Hi, where can I find info about how to make the pad design to work for VSSOP48 0.4 mm Pitch & TSSOP56 0.5 mm pitch components? I should also mention that we are working in a project that this 14 layers High-Frequency RoHS board is included. The pad c
Electronics Forum | Mon Oct 17 11:16:09 EDT 2005 | slthomas
There are a lot of things that might affect your cleaning efficiency. Paste type (no clean or w/s?), cleaning chemistry, aperture aspect ratio (aperture width/stencil thickness), "linty" wipes, etc. Another thing you need to look at is the frequency
Electronics Forum | Fri Oct 14 19:41:06 EDT 2005 | KT
We encounter this kind of issue. We use stencil clean in the stencil printer and also use air to blow aperture after cleaning. We are having some luck !!
Electronics Forum | Fri Oct 14 14:09:19 EDT 2005 | bschreiber
Your problem is not the 0.4 pitch. Your problem is the manual cleaning. Manual cleaning will only remove the solder paste from the surface of the stencil. What's more, manual cleaning will force additional contamination into the 0.4 pitch apertures
Electronics Forum | Fri Oct 21 14:13:08 EDT 2005 | mafc65
1.- Clean bottom and top stencil with a cloth/alcohol at same time.Pay special attention to fine pitch locations. 2.- Clean again bottom stencil side .To prevent any residual of solder 3.- Blow air with a air gun under the stencil to remove the solde
Electronics Forum | Wed Jun 22 18:52:56 EDT 2011 | semiconjt
tTo explain what I mean...sorry for my bad Engilsh... please find short " patchwork stencil" description from EPP Europe. http://www.epp-online.de/europe/-/article/16537487/15944614/Innovators-of-laser-processing-technology /art_co_INSTANCE_0000/max
Electronics Forum | Thu Apr 11 19:12:11 EDT 2002 | djarvis
Sorry fellas -disagree. We only clean our stencils in the ultrasonic machine at the end of the run. If the same pcb is up the next day we clean them by hand. We use Electrolube SSS and the used rolls from the in line under stencil cleaner. Wipe the
Electronics Forum | Fri Apr 11 01:52:26 EDT 2008 | andrzej
0,66 Is it ok ? Is it overprinted r - radius of stencil aperture - 9mils ~ 230um t - stencil thickness - 150um Other data : diameter of soldermas - 26mils Diameter of pad - 18mils Diameter of stencil apertre - 18mils Pitch - 0,8mm ~ 31mils What s
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
