Electronics Forum: qfn (Page 5 of 57)

How to improve the solder quality of QFN?

Electronics Forum | Thu Jun 23 22:30:31 EDT 2005 | wjxingggg

poor soldering of PCB. > unfit stencil hole of QFN > incoming problem for this component >...... What is your opinion? or what can I do for the next step? Thanks again.

Solder voids on QFN Packaging

Electronics Forum | Mon Sep 19 07:56:19 EDT 2005 | Pop

How we can improved the Solder voids on QFN Packaging. Actually we adjust the time for solking to long . But is not affected. Pls advise. ThANK YOU

QFN32 Vision Type on Fuji FIP3???

Electronics Forum | Tue Mar 21 05:56:24 EST 2006 | aj

Hi All, Can anyone advise what the most suitable Vision type to use on QFN32 inspection Fuji FIP3 Machine. Also the P=Pattern.. Thanks in advance, aj...

QFN soldering

Electronics Forum | Mon Nov 12 09:13:50 EST 2007 | russ

Chunks is right, reduce center pad by 50% print the signal pads at 1:1. this will ensure you solder QFNs fine regardless of the actual part. If you are not printing then it is process capability issue and has nothing to do with QFN but rathjer small

QFN soldering

Electronics Forum | Fri Nov 16 18:08:32 EST 2007 | mika

So you are saying that 0.13 mm stencil thichknes and 20% reduction of the middle cooling pad is working for you? Just as I said.. Best Regards, Mika Ps. Keep in mind that the QFN is designed to do some heavy work, while enough "heat transfer" occur.

QFN soldering

Electronics Forum | Mon Jul 07 17:25:04 EDT 2008 | thughes

I'm curious to know what the pitch of the outer pads is/was on your device. Also, is this a general formula you use on all of your QFN devices or was this for one specific device?

Anyone facing QFN package crack problem ?

Electronics Forum | Tue Nov 27 20:51:18 EST 2007 | chs

Anyone can share experience on package crack for QFN package. This package is so sensitive to any external force. Any good recomendation on desoldering / rework procedure.

QFN20 Solder recommendations

Electronics Forum | Sun Feb 24 15:24:48 EST 2008 | davef

With such a low standoff [eg, 1-2 thou of solder], we doubt that you can clean under QFN, either. For more, search the fine SMTnet Archives to find threads like http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=19247

QFN32 rework

Electronics Forum | Mon May 12 08:23:29 EDT 2008 | mun4o

Hi all, we use QFN32 in our products.In this moment we can not equipment about rework this component.Could someone recomend me some tape of equipment for rework.

Any differences between QFN's and LCC's?

Electronics Forum | Tue Jul 01 12:22:09 EDT 2008 | gpe.

Hi, I have a question fou you guys: Is there any difference between LCC's and QFN's? or, Are those just two terms to call the same part? Thanks for your help. Gpe.


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