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Https://suddendocs.samtec.com/prints/t1m-single-row-footprint.pdf conn samtec card-edge socket high-speed 0.8 mm BGA-64, 10x10 raster, 4.618x4.142mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UCBGA-49, 7x7 raster, 3x3mm package, pitch 0.4mm; see section 7.1.1 of http://www.st.com/resource/en/datasheet/stm32f401ce.pdf WLCSP-49, 7x7 raster, 3.89x3.74mm package, pitch 0.4mm; see section 7.8 of http://www.st.com/resource/en/datasheet/DM00387108.pdf Texas.

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