Why is the Quad Flat No-Lead Package (QFN) not recommended for a PCB thickness above 32 mils? - Why is the Quad Flat No-Lead Package (QFN) not recommended for a PCB thickness above 32 mils? Description For the QFN package, Altera® has run board level testing on this package and the solder joint reliability results shows that this package will only be suitable for a PCB thickness of 32 mils or below. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Cyclone® IV FPGAs'] ['novalue'] ['novalue'] ['novalue']