The aQFN app note suggests a fully open paste stencil (opening size = pad size) for the center pad of the aQFN.
Our assembly house is suggesting a windowed paste stencil. Like shown below:
The rationale is to reduce voiding by providing an escape route for gas released during reflow, and to eliminate shifting and skewing by reducing the volume of paste and voids under the part.
Do you have high confidence in your suggested non-windowed paste mask? Could you provide some feedback on our suggested paste mask?
