Electronics Forum: stencil aperture (Page 1 of 117)

0402 pad and stencil aperture design

Electronics Forum | Fri Oct 31 07:52:23 EDT 2008 | davef

For a better understanding of decoupling capacitors, look here: * http://en.wikipedia.org/wiki/Decoupling_capacitor * http://www.hottconsultants.com/techtips/decoupling.html * http://pcdandf.com/cms/content/view/3410/95/

0402 pad and stencil aperture design

Electronics Forum | Thu Oct 30 15:07:40 EDT 2008 | jemills

Hello I have a new 0402 pad design on a recent board were building in future. On closer look i thought the pad was a thru hole mount , but upon closer inspection the round pads are for 0402 comps. I had a discussion with the engineer and he said

0402 pad and stencil aperture design

Electronics Forum | Thu Oct 30 15:36:18 EDT 2008 | grantp

Hi, Sounds like your engineer does not know what he's doing. We have developed and built hundreds of thousands of boards with normal square pads for 0402, and we just use a 5 thou stencil with 5% reduction and it works well. Decoupling? What is tha

0402 pad and stencil aperture design

Electronics Forum | Thu Oct 30 22:29:58 EDT 2008 | davef

For most applications, a nice square [or rectangle] pad works just fine. Assemblers ship boat loads of boards with these every day. It's reasonable for tight decoupling capacitor requirement applications to use round or radiused pads for components

Stencil aperture positional accuracy

Electronics Forum | Thu Jun 14 19:09:40 EDT 2012 | kahrpr

When we get a very large board that's arrayed or one I think will be difficult we send a sample board. It helps our stencil manufacturer get it right. So for it has worked for us.

0402 aperture design lf

Electronics Forum | Thu Apr 12 09:13:41 EDT 2007 | aj

Hi all, What stencil aperture designs do you use for 0402 components? Thanks in advance for replies. aj...

Stencil aperture positional accuracy

Electronics Forum | Thu Jun 14 06:13:47 EDT 2012 | ccgooi

I am running a product with board size ~18"X16". I faced stencil aperture positional accuracy issue which slightly shifted at both end of stencil at positive and negative in X direction thus causing solder paste to pad mis-registration. Due to this s

Stencil aperture positional accuracy

Electronics Forum | Thu Jun 14 13:12:53 EDT 2012 | scottp

I haven't been in a bad enough situation to try it yet, but I had a conversation with Alpha Metals when we started doing 0.4 mm pitch and they mentioned that if we got into a situation like yours we could send them a board and they'd modify the artwo

Stencil aperture positional accuracy

Electronics Forum | Thu Jun 14 21:48:41 EDT 2012 | kmots15

We work with a lot of larger boards over 24", haven't run into this issue yet. I agree with scott could be your board supplier if they are lower quality, from something as simple as unit conversions in CAD to dealing with different temperatures. A

Stencil aperture positional accuracy

Electronics Forum | Fri Jun 15 18:22:49 EDT 2012 | stentech

Our lasers are accurate to +/- approx. 5 microns over 20 "X-Y. I have seen boards 18 x 24 stretch 7mils. I would agree with others, the only way is to send a board to you stencil vendor so they can edit the file to match the board. This is very commo

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