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And thermal vias; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f031k6.pdf WLCSP-25, 5x5 raster, 2.133x2.070mm package, pitch 0.35mm; see section 7.2 of http://www.st.com/resource/en/datasheet/stm32f207vg.pdf VFBGA-49, 7x7, 5x5mm package, pitch 0.65mm UFBGA-32, 6x6, 4x4mm package, pitch 0.8mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32f091vb.pdf.

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