Electronics Forum | Tue Nov 28 20:12:41 EST 2006 | davef
We don't have a gap between the lead and the pad after a SM joint is soldered. On our boards, this space is filled with the solder intended to attach the component to the board. How high do components sit above the surface of a board? Most people a
Electronics Forum | Sun Sep 05 03:52:11 EDT 1999 | Brian
| 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 | Wed Nov 29 10:10:50 EST 2006 | M. Sanders
I'm sorry, Dave - I didn't make myself very clear. Yes, this space (not really a "gap") is filled with solid solder. For instance, if you place a gull-wing component in solder paste, after reflow, there will probably be a thin film of solidied solder
Electronics Forum | Tue Nov 28 15:10:50 EST 2006 | M. Sanders
Unfortunately, I don't have a copy of IPC-A-610 D on hand, however, I believe in IPC-610, this �floating height� between lead and pad has no maximum specification restriction. As long as there is no voiding, it is still acceptable for all 3 classes.
Electronics Forum | Tue Sep 07 09:11:33 EDT 1999 | Dave F
| 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 | Wed Nov 29 11:46:57 EST 2006 | slthomas
IPC 610 *C* states that the solder thickness requirement is a properly wetted termination is evident. Fillet height is another aspect and is usually specific to the package but is some function of solder thickness plus a percentage of lead height. D
Electronics Forum | Wed Nov 29 20:30:22 EST 2006 | davef
Your customer is so poorly educated that you should decline their work, because this will not be the last time they waste your time with their cockamamey theories.
Electronics Forum | Thu Nov 30 14:49:54 EST 2006 | M. Sanders
Dave, Thanks - I couldn't agree with you more. Unfortunately, our "bean counters" have a different frame of mind.
Electronics Forum | Fri Dec 01 10:18:10 EST 2006 | realchunks
You're right Hussman, I kinda missed the follow thru on that one! Sorry for any confusion on my part boys. Huss, you going to APEX this year? We missed ya last year. L.A. this year....boo!
Electronics Forum | Fri Sep 03 03:56:41 EDT 1999 | Wolfgang Busko
| 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
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