Electronics Forum | Mon Jul 16 14:38:22 EDT 2001 | ohboy
If your pad designs don't meet IPC recommendations, using home plate may have adversely affected the (possibly marginal) placement tolerances. This could also be caused by an incorrect home plate design, which IPC has also given recommendations for,
Electronics Forum | Fri Jul 13 14:56:01 EDT 2001 | stevenamacdonald
One of our board vendors recently switched their stencil design to home plate apertures. Since the change the quality and yield of their PCB's has went south, Could this process change be the cause?
Electronics Forum | Fri Jul 13 19:08:55 EDT 2001 | mparker
Home plate apertures are designed to reduce or eliminate solder balls that occur when placing a chip and reflow of the solder. This aperture type is usually desired when processing with a "no-clean" solder paste. The design of the aperture is usually
Electronics Forum | Sat May 27 11:13:27 EDT 2000 | Steve Thomas
Subject line pretty much says it all. We're going to try some stencil design changes to reduce midship solder balls. Anyone have some comments on pros or cons for either?
Electronics Forum | Sat May 27 12:50:21 EDT 2000 | Micah Newcomb
Steve, I use homebase apertures as a standard for all chip parts and have no complaints, no solder beading, no issues. I have had to replace almost all stencils ordered previous to my arrival as they all caused defects (7-9mil thickness and 1:1
Electronics Forum | Sun May 28 08:21:52 EDT 2000 | Sal
Can't agree more than moving over to Homebase apertures, But ensure that the cut back angle is correct,to acute of and angle will leave you with an inadequate contact area fot the terminations on the chip components and you will start seeing insuffic
Electronics Forum | Tue Oct 10 12:56:15 EDT 2000 | Ken Van ZIll
I agree that homplate is a good design, but also this could be caused by the stencil thickness and aperture size, if you are at 7-9 mils thick stencil and a 1:1 ratio on aperture size then 2 things i know of will happen, one a squishing out of past o
Electronics Forum | Fri Sep 09 11:37:27 EDT 2005 | ???
Try home-plated the stencil apertures, and make "V" shape home-plated outside edges of two pads instead of between two pads.
Electronics Forum | Fri Sep 09 14:03:06 EDT 2005 | Mei
Nomorely the V-shape home-plated apertures look like two opening mouth facing each other. But this time just opposite way. And make 30% home-plated. Hope you can understand.
Electronics Forum | Fri Jun 22 10:56:07 EDT 2007 | ed_faranda
5mil works great. Just make sure that you screen alignment is dead on. We're using a SAC305 with a home plate design. I ran a test a couple of months back and found that the home plate design works the best with 0402s.
