Electronics Forum: overprints (Page 1 of 11)

Maximum Overprint

Electronics Forum | Tue Jun 28 11:31:23 EDT 2005 | kennyg

Anyone know of a maximum solder overprint formula? I need to overprint a 0.011" wide aperture but want to go out to 0.050" overprint. This seems extreme, but necessary as I can't go out in width due to numerous issues. It seems like one could come

Overprint, solder flow back

Electronics Forum | Wed Dec 06 07:24:22 EST 2006 | davef

Successful solder paste overprint is a function of the solder paste rheology, solder mask and through hole component stand off. * Solder mask with a high surface energy will permit a larger overprint than a solder mask with a lower surface energy. In

BGA Aperture

Electronics Forum | Wed Jun 20 08:14:36 EDT 2007 | pavel_murtishev

Good afternoon, You should use overprint technique if you have any problems with paste volume (PIH technology and mixed designs, for instance). Otherwise, it is useless. Overprint has to be made in such way so that paste would have an ability to flo

Overprint, solder flow back

Electronics Forum | Tue Dec 05 03:39:39 EST 2006 | pavel_murtishev

Good afternoon, Due to problems with power connector soldering I have to overprint paste on pads for this connector. Stencil thickness is 125um and I cannot make it thicker. Area ratio of chip resistor assemblies limits stencil thickness to 125um. R

Maximum Overprint

Electronics Forum | Tue Jun 28 21:54:44 EDT 2005 | davef

Fabricators take different approaches in developing paste that is more or less prone to solder balling. That being said, you should be able to overprint 250 thou, no problem. Prove this to be correct by printing paste on a scrap board with an obsol

Overprint, solder flow back

Electronics Forum | Tue Dec 05 08:23:14 EST 2006 | davef

How about a stepped stencil? Not ideal but ... As far as overprinting goes, try: http://www4.uic.com/wcms/WCMS2.nsf/index/Resources_44.html

Pasting a thru-hole part at SMT

Electronics Forum | Tue Dec 04 18:38:28 EST 2007 | stevek

With two rows, you can overprint to the outside to make up the solder volume. It's when you have rows in the middle that things get tough. A good stencil house should already have overprint libraries for this.

Castellated Module Reflow Problems

Electronics Forum | Fri Jun 10 19:05:23 EDT 2022 | llawrence

Overprint, that is putting extra solder on with the stencil that is even further out from the pads, with the idea that it will suck that solder up during reflow? I could give that a try. Are there any general recommendations when overprinting? And wh

Printing on soldermask

Electronics Forum | Mon May 20 13:14:05 EDT 2024 | dontfeedphils

I almost always go with an overprint as long as it's feasible. I haven't had much problem with solder-balling when overprinting. I'd give it a try and see how it works for you.

PBGA overprint

Electronics Forum | Sun Oct 10 15:07:04 EDT 2004 | GIO

sorry..it s 40 mils...pitch,...but stencil aperture is square...ANY COMMENTS.. THANKS RUSS...

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