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7.1.1 of http://www.st.com/resource/en/datasheet/stm32f401ce.pdf WLCSP-49, 7x7 raster, 3.141x3.127mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UCBGA-49, 7x7 raster, 2.999x3.185mm package, pitch 0.5mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f303r8.pdf WLCSP-49, 7x7 raster, 2.965x2.965mm package, pitch 0.8mm; see section 7.5.

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