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WLCSP-90, 10x9 raster, 4.223x3.969mm package, pitch 0.4mm; see section 7.1 of http://www.st.com/resource/en/datasheet/DM00213872.pdf WLCSP-64, 8x8 raster, 4.466x4.395mm package, pitch 0.4mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f031k6.pdf WLCSP-25, 5x5 raster, 2.097x2.493mm package, pitch 0.8mm; see section 7.5 of http://www.st.com/resource/en/datasheet/stm32f031k6.pdf WLCSP-25, 5x5 raster, 2.423x2.325mm package, pitch 0.5mm; see section 7.8 of http://www.st.com/resource/en/datasheet/DM00387108.pdf Texas Instruments, BGA Microstar Junior, 2x2.5mm, 12 bump 4x3 grid, NSMD pad definition Appendix A BGA.

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