Electronics Forum | Fri Nov 30 19:39:51 EST 2007 | mika
Hi chs, What type of QFN or MLF package are we talking about? Assuming there is a middle thermal pad? Body Size & no. of terminals & pitch? What about your statement: "This package is so sensitive to any external force". Can you please explain what y
Electronics Forum | Tue Jun 03 01:03:04 EDT 2008 | daxman
Hi, I think what you are describing is a half-etch QFN, which causes the 3 mil gap. In our process, we don't require solder to bridge this gap as it's internally connected to the bottom lead. I'm not sure if this is the question you're asking, but
Electronics Forum | Fri Jun 20 03:47:24 EDT 2008 | philip
Hi all, any good recommendation for PbF paste application to reduce voids underneath the QFN thermal pad (stencil thickenss? opening? via hole? reflow profile etc)? We have tried few stencil opening design but no significant improvement as seen. Ther
Electronics Forum | Thu Jun 10 16:51:01 EDT 2010 | daxman
Hi Manuel, We've been placing QFN's with our CP6's for a long time now. We use vision type 10 just like you describe. I wouldn't bother with front lighting & trying to pick up the leads. Inspecting the leads doesn't provide better accuracy. I would
Electronics Forum | Sun May 19 23:38:57 EDT 2013 | shrikant_borkar
We are EMS. Later revisions and Other models are get Modified. Now we have some remain Stock of Pcbs abd there end also. We have taken trial with Reduction in Apparatuses. But even small amount of solder paste at thermal Pad is causing QFN lift up.
Electronics Forum | Wed Aug 09 20:03:22 EDT 2017 | ttheis
We're having problems with Kester pastes (NP545 pb free and EP265 60/40 no clean pastes.) All of our other components reflow just fine with either paste, but for some reason this QFN chip doesn't wick to the QFN's pads well. It seems like some type
Electronics Forum | Mon Nov 13 09:40:01 EST 2017 | philc
Just a few thoughts, as we use similar quite frequently without issues. Ensure correct support when pasting the board, especially if it is thin. Correct support when placing the part. Is it placed correctly by the machine? If it is very slightly of
Electronics Forum | Sat Dec 02 10:23:47 EST 2017 | tomh
Have you ever heard of "Solder Mask Defined Thermal Pads"? I wrote a short blurb on this here - https://www.pcblibraries.com/forum/ipc7093a-btc-qfn-solder-mask-defined-thermal-pad_topic2154.html This technology saves fabrication costs by not havi
Electronics Forum | Mon Apr 04 12:17:55 EDT 2005 | DasonC
You are from France, BeamOn web site, http://www.beamon.com
