Screaming Circuits: CAD Library or Substitution Issues


CAD Library or Substitution Issues

We recently ran across an issue out on the shop floor that was most likely due to the components library inQfn_on_qfp_land  the CAD package. A QFN part was sent for this assembly but the land pattern on the board was just a bit too big. The QFN pads would not reach the pcb solder pads.

Most likely, the designer accidentally selected the library part for a QFP variant of the chip instead of for a QFN. The parts are pretty similar in size if you exclude the leads on the QFP package. It's also possible that someone accidentally purchased the QFN variant when a QFP was called for.

Just one more thing to add to your design-check.

Duane Benson
It's just over that next hill...

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