Electronics Forum: area ratio (Page 1 of 18)

Air Quality sensor for smt area

Electronics Forum | Tue Feb 07 16:32:13 EST 2023 | glasscake

Good ventilation is also important to removing aerosols and other vapors. Make sure your building HVAC is pulling in a good portion of outside air. If people are complaining try to up the ratio of recirculated/outside air. This will add cost dependin

aspect ratio for massive components on the solder side of double-sided reflowed PCBs

Electronics Forum | Thu Oct 19 12:34:36 EDT 2000 | lwatson

I can't seem to find an article about the limiting mass of a SMT component on the solderside of a double-sided reflowed PCB. I'm pretty sure that Phil Zarrow did an article on this subject. It went something like the mass/land surface area?

Stencil Design

Electronics Forum | Tue Sep 16 21:52:19 EDT 2008 | rayjr1491

10x16 by 5 mil stencil gives me a area ratio of .615 unless I am calculating incorrectly. I will try and attach some images tomorrow. By reducing the Y direction my area ratio s below .6 and I thought this was not advisable. Your help is muc appreci

SMT Stencil Aperatures

Electronics Forum | Fri Jun 03 17:24:35 EDT 2005 | davef

Search the fine SMTnet Archives for "aspect ratio" and for "area ratio".

Stencil Aperture Aspect Ratio

Electronics Forum | Tue Jun 17 08:52:39 EDT 2003 | russ

Aspect ratio = width of aperture divided by height. E.G. 6 mil stencil at 9 mil wide = aspect ratio of 1.5. Value should be 1.5 min. Area ratio - use when length and width of pad are roughly same dimension like for BGAs and 0805 and smaller R-nets

uBGA placement

Electronics Forum | Fri Sep 23 10:17:46 EDT 2005 | davef

You need to keep your stencil area ratio above 65.

Stencil Design

Electronics Forum | Tue Sep 16 16:30:50 EDT 2008 | rayjr1491

Do you have any suggestions on what the area ratio should be for all PADS?

Fine Pitch Printing Issues

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?

Imm Silver & Screen Printing

Electronics Forum | Tue Aug 01 12:38:13 EDT 2006 | razor9114

I would go with a 5 mil stencil as well, we experienced some similar issues with micro BGA's and the area ratio was suspect as well as the MESH size of the paste. We went to Type IV paste and verified our area ratio and everything ran beautifully. Pa

paste release

Electronics Forum | Sun Feb 07 10:51:09 EST 2010 | davef

The ratio of aperture opening area to aperture wall area is a critical evaluation measure for the release of the printed solder paste. The stencil thickness has the biggest impact on area ratio.

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