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7.1.1 of http://www.st.com/resource/en/datasheet/stm32f401ce.pdf WLCSP-49, 7x7 raster, 3x3mm package, pitch 0.65mm; see section 6.6 of http://www.st.com/resource/en/datasheet/DM00273119.pdf X1-WLB0909, 0.89x0.89mm, 4 Ball, 2x2 Layout, 0.35mm Pitch, http://www.latticesemi.com/view_document?document_id=213 WLCSP-16 2.225x2.17mm, 2.17x2.225mm, 16 Ball, 4x4 Layout, 0.5mm Pitch, S-PWSON-N10, DSC, http://www.ti.com/lit/ds/symlink/tps63060.pdf USON-10 2.5x1.0mm_ Pitch 0.5mm vertical Molex KK-254 Interconnect System, old/engineering part number: 5273-02A example for new part number: 09-65-2088, 8 Pins per row (http://suddendocs.samtec.com/prints/lshm-1xx-xx.x-x-dv-a-x-x-tr-footprint.pdf), generated with kicad-footprint-generator TE, 1-826576-7, 17 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf.

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