Electronics Forum | Thu Mar 31 07:56:31 EST 2005 | cn
I agree with chuck, but would like to add. 2D is a great option and helps to keep your printing process in check, it will measure the x & y coverage on the pad. It will help you determin when your stencil aps become clogged or when the bottom of your
Electronics Forum | Wed Jan 08 08:20:52 EST 2014 | emeto
To most of our boards I give 20-30% tolerance in both directions. From experience if you have big aperture on your stencil, the squeegee will scoop certain amount of paste from this aperture and you will see lower height. Depending on your board supp
Electronics Forum | Wed Feb 10 15:49:53 EST 1999 | Gary Sickenger
Helo, Is it common for actual print height of solder paste to exceed the stencil thickness. For example If the stencil is 6mill thick and the actual height of the print is apx. 10 or 11mill. What causes the paste height to be greater than the sten
Electronics Forum | Thu Feb 23 23:24:14 EST 2006 | KEN
Depends what is adjacent to the step. 1206 chips could reside closer than say a 16 mil fine pitch. Larger apertures are more forgiving to height variations than small apertures.
Electronics Forum | Tue Jul 13 16:43:06 EDT 2021 | jseewald
Is the variation between markings human-detectable, or does the issue only crop up when you use a scanner? Different scanners can definitely have different results. Try a few models, and make sure you aren't using any damaged scanners. When you se
Electronics Forum | Thu Dec 18 15:48:25 EST 2003 | Subhash Nariani
Hello, Does anyone have experience with the PCB assembly of 0.5mm pitch chip scale packages with HASL finish? Characterization data that you can share? Tribal knowledge has it that the height variations of the solder prevent the use of HASL for fin
Electronics Forum | Thu Feb 11 09:45:06 EST 1999 | Dave F
| | | Helo, | | Is it common for actual print height of solder paste to exceed the stencil thickness. For example If the stencil is 6mill thick and the actual height of the print is apx. 10 or 11mill. What causes the paste height to be greater t
Electronics Forum | Fri Feb 12 19:02:21 EST 1999 | Jon Medernach
|As the squeegee shears the paste at the face of the stencil the vehicle used to contain the solder spheres compresses and expands out the top of the opening after the squeegee passes. This is 1 or 2 mil at most. The peaks should not be considered
Electronics Forum | Tue Oct 12 10:24:50 EDT 1999 | Jose RG
Hi, We are in the way to evaluate different solder pastes, improve our solder paste incoming inspection steps, re-define our stencil requirements and the following questions are open. Two questions, 1- Is anybody using/requiring 1000 Kcps or more
Electronics Forum | Fri Mar 12 11:59:50 EST 1999 | Ray Morford
AVX and a few other companies make these chip transient voltage suppressors (TVS) parts that are a real *PAIN* to use. According to AVX: "Due to the semiconducting nature of the doped Zinc Oxide (ZnO) ceramic material, SMT TransGuards are no
