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QFN Rework

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#61210

QFN Rework | 24 February, 2010

Is it necessary, or beneficial to apply solder paste on the PCB pads for QFN rework? It seems that using micro stencils is not the best approach. Any guidelines or suggestions available for paste deposition techniques?

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#61213

QFN Rework | 24 February, 2010

Start with the SMTnet Express Newsletter [blue bar on the left side of this page] February 18, 2010 written by our old friend Bob Wettermann

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#61219

QFN Rework | 24 February, 2010

We just stencil the part not the pads if you stencil both then you probaly have to much paste the QFN will lift becuse of the center pad. if the question is screen the part or the pad our boards have parts so close to the QFN that stenciling the pcb is A problem. I realy don't see any differance if you paste the part or the pads

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#61222

QFN Rework | 24 February, 2010

Here is a solution we have developed

http://www.sipad.com/Show-Posters-2009.pdf

Matt Kehoe

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