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Back(https://www.onsemi.com/pub/Collateral/NUF4401MN-D.PDF#page=6), generated with kicad-footprint-generator ipc_gullwing_generator.py PQFP256 28x28 / QFP256J CASE 122BX (see ON Semiconductor 122BX.PDF 32-Lead Plastic Thin Quad Flatpack No-Lead Package, 9x9mm Body (see Atmel Appnote 8826 64-Lead Plastic Thin Quad Flatpack (MW) - 10x10x1.0 mm Body [QFN] with thermal vias; see section 7.1 of http://www.st.com/resource/en/datasheet/stm32f411vc.pdf WLCSP-49, 7x7 raster, 3x3mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UFBGA-15, 4x4, 3x3mm.
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