Here you can find discussions pertaining to finding or creating Symbols and package footprints. Anything to do with Schematic or layout parts will be placed in this discussion.
yes, i would like to know what is industrial standard stencil opening vs. recommendation stencil opening for qfn
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The manufacturer's data sheet should provide you with the solder paste layout and dimensions. In general the solder paste pads for should be the same size (or slightly smaller) and shape as the physical pads you will be soldering to. The only exception is the center pad which should have a crosshatch configuration. It is best to review the data sheet for the part you are going to use but here is one example that you may find helpful.
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