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Back5x5 raster, 2.097x2.493mm package, pitch 0.65mm UFBGA-32, 6x6, 4x4mm package, pitch 0.5mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32l052t8.pdf WLCSP-36, 6x6 raster, 2.553x2.579mm package, pitch 0.4mm; see section.
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