Electronics Forum | Wed May 29 19:04:39 EDT 2002 | russ
I have heard of using diamond apertures for BGAs to tell you in XRay inspection if you reflowed (diamond means that paste did not reflow) that is the inly thing I coud think of as to why you qould want to do this. Russ
Electronics Forum | Wed May 29 11:11:16 EDT 2002 | jax
Are you using Diamond apertures to achieve a volumn you cannot get through round ap's?
Electronics Forum | Wed May 29 13:10:55 EDT 2002 | wilcoxito
Diamond apertures were just an idea proposed by my plant manager. They are not necessary, by far. Thanks for all your input.
Electronics Forum | Tue Jun 04 12:33:57 EDT 2002 | dason_c
We use the diamond shape on the CBGA/CCGA only, all the PBGA are using the regular round shape.
Electronics Forum | Tue Jan 30 17:58:49 EST 2007 | flipit
Hi, I would not be too concerned about what the shape of your wirebonding fiducial is. Cross, Square, Diamond, Circle, will all work well for you. I use a "+" and a diamond. Your machine magnification will be great, so don't make the fiducials to
Electronics Forum | Tue Sep 20 09:07:23 EDT 2016 | davef
5 Common Causes of Bubbles in Conformal Coating (and Their Remedies)[Diamond-MT's Blog]
Electronics Forum | Wed May 29 10:11:50 EDT 2002 | wilcoxito
Thanks for your input, Alex. I appreciate it. I'd still like some input on diamond-shaped apertures if anyone has had experience with them.
Electronics Forum | Wed May 29 10:52:56 EDT 2002 | slthomas
Just wondering why you'd use a diamond shaped aperture? Seems like it'll just fill in the corners and be pretty much round anyway, so why not just start out that way and keep the volume you want?
Electronics Forum | Wed May 29 13:16:33 EDT 2002 | jax
The only reason I can see for doing this is: Apply more paste than a one-to-one round can provide. Square, diamond, etc... does not matter. Normally this is done for PTP applications but,... If it gets the job done, who cares.
Electronics Forum | Thu May 30 07:13:46 EDT 2002 | matherat
Ben, I am not sure about diamond shaped pads but if you are just getting into BGA you need to know about SIPAD ssd. http://www.sipad.com mkehoe
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