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Of http://www.st.com/resource/en/datasheet/stm32l031f6.pdf WLCSP-25, 5x5 raster, 2.423x2.325mm package, pitch 0.65mm UFBGA-32, 6x6, 4x4mm package, pitch 0.4mm; see section 48.2.4 of http://ww1.microchip.com/downloads/en/DeviceDoc/DS60001479B.pdf WLCSP-81, 9x9, 0.4mm Pitch, https://pdfserv.maximintegrated.com/package_dwgs/21-100302.PDF, https://pdfserv.maximintegrated.com/package_dwgs/21-100302.PDF NXP VFBGA-42, 3.0x2.6mm, 42 Ball, 6x7 Layout, 0.4mm Pitch, YFF0006, NSMD pad definition (http://www.ti.com/lit/ml/mxbg270/mxbg270.pdf Texas Instruments, DSBGA-6, 0.704x1.054mm, NSMD, YKA pad definition.

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