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Back20-Pin Thermally Enhanced Thin Shrink Small Outline (SM) - 5.28 mm Body [QFN] with thermal vias; see section 6.3 of http://www.st.com/resource/en/datasheet/stm32f103tb.pdf LFBGA-144, 12x12 raster, 7x7mm package, pitch 0.4mm; see section 6.6 of http://www.st.com/resource/en/datasheet/DM00273119.pdf X1-WLB0909.
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