PCB Assembly Services - Screaming Circuits: Good QFN, Good QFN Paste Layer


Good QFN, Good QFN Paste Layer

Qfn_package_sm_2I write a lot here about things that go wrong with various layouts. Hopefully by doing that, I can help some of you avoid common pitfalls. But I should probably write about more good things though to balance it out.

So, here's a decent example. This is a good way to specify the solder paste layer for Good_qfn_stencil_c_2 your QFN parts. Notice that the center thermal area is segmented to give about 50% paste coverage. This will lead to a secure and reliable placement with minimal voiding underneath.

Good_qn_before_pasteThere are a lot of different ways to segment the stencil for good paste coverage. This is one is easy to do and will work well. Note that this QFN doesn't have any thermal vias so here we don't have to worry about any via in pad issues. If you do need thermal or grounding vias in the pad, check out our section on via-in-pad for guidelines to help properly deal with the.

Duane Benson
All we are is paste on the pcb
Just a drop of solder on an endless stencil


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