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73 Ball, 9x9 Layout, 0.4mm Pitch, https://pdfserv.maximintegrated.com/package_dwgs/21-100489.PDF WLCSP-25, 5x5 raster, 2.133x2.070mm package, pitch 0.5mm UFBGA-64, 8x8 raster, 4.466x4.395mm package, pitch 0.4mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f746zg.pdf WLCSP-144, 12x12 raster, 7x7mm package, pitch 0.8mm; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f103ze.pdf Lattice caBGA-381 footprint for the Adafruit Feather 32u4 FONA.

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