Electronics Forum | Thu Mar 28 13:19:14 EDT 2019 | davef
There is no industry standard for BTC stand-off height. "IPC-7093A Design and Assembly Process Implementation for Bottom Termination SMT (BTC) Components" just finished "Final Draft for Industry Review" in December 2018. It mentions stand-off height
Electronics Forum | Mon Jul 01 04:50:04 EDT 2019 | sssamw
Yes, No standard.Normally QFN supplier suggest 50-75 um (2-3 mil), but it's very hard to achieve and hard to make consistent stand-off in prodution.
Electronics Forum | Tue Mar 26 16:36:00 EDT 2019 | charliedci
80% on edge pads and >60% on center pad(s). So with this in mind the component body should stand off a bit.
Electronics Forum | Fri Jun 20 09:38:56 EDT 2003 | caldon
Hi John- First, I do not have first hand experience so my input is pure theory. This type of package (in Some Cases) has a center grounding bonds and leadless legs ups the difficulty tremendously. With no stand-off from the Balls(or Legs) when the so
Electronics Forum | Tue Mar 24 20:25:18 EDT 2009 | davef
It is very common to use low residue flux with low-standoff parts. On the other hand, sure you can clean under low-standoff parts. We've talked about this previously. Search the fine SMTnet Archives to find threads like: http://www.smtnet.com/Forums
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