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
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?
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
Electronics Forum | Fri Jun 03 17:24:35 EDT 2005 | davef
Search the fine SMTnet Archives for "aspect ratio" and for "area 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
Electronics Forum | Fri Sep 23 10:17:46 EDT 2005 | davef
You need to keep your stencil area ratio above 65.
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?
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 Mar 25 10:37:15 EDT 2024 | wippsen
Area Ratio Calculator V2.0 von Dek
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
