Electronics Forum | Tue Jun 06 11:57:12 EDT 2006 | Chunks
IPC 610 says acceptable Class 1 (Class 2, 3 indicator) if they are entrapped/encpsulated balls within 0.13mm of lands or pads. or exceed 0.13mm in diameter. Defect Class 1,2,3: Solder ball violates min electrical clearance. Solder balls not entrap
Electronics Forum | Thu Sep 02 21:02:55 EDT 1999 | Paul Wareham
We've noticed that there are many different recommendations for pad sizes for various SMT parts. This seems to vary wildly from manufacturer to manufacturer for the same case sizes. Is there any standards that can used used to specify these sizes?
Electronics Forum | Tue Oct 05 10:13:48 EDT 1999 | Frank Fossett
I am a new employee at a company that has had a large turnover of employees over the past year. I am working on a board (components on one side only), the engineer wants to use an .035 pad with a .012 dia. hole, there are no via's under the zero clea
Electronics Forum | Wed Jun 07 21:54:11 EDT 2006 | mumtaz
Ha ha! davef finishes you guys off again!
Electronics Forum | Wed Jun 07 22:02:57 EDT 2006 | davef
Similarly, we have eliminated solder balls by using an aqueous washer.
Electronics Forum | Wed Jun 07 21:45:53 EDT 2006 | davef
We do not understand the question. Take a deep breath, remember not all of us are trained as geologists. The smallest solder ball we've seen is a little less than 5 nm.
Electronics Forum | Thu Jun 08 09:54:07 EDT 2006 | slthomas
Awwww, man. I was looking for something a little less on the anecdotal side for our local municipality's environmental stewards.
Electronics Forum | Tue Jun 06 15:45:18 EDT 2006 | slthomas
Yep. What I'm really looking for is the minimum radius of curvature for 63/37, which is a function of it's surface tension. It's physical properties issue, not an agency issue. I've seen some references that I have interpreted to mean that it's some
Electronics Forum | Thu Jun 01 16:30:05 EDT 2006 | slthomas
Just wondering if anyone knows this off the top of there head. I might be able to figure out the math based on surface tension (this is 63/37 so the data is out there) but I REALLY do not want to put that kind of effort into this. :/ Editing to clar
Electronics Forum | Wed Jun 07 10:56:38 EDT 2006 | Chunks
In the past, I would normally tell out highly talented inspectors to leave the balls there. The were trapped in the flux residue and were hard to remove. Never caused a problem. But then there was an incident where someone had the bright idea to u
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