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3.15x3.13mm, 49 Ball, 7x7 Layout, 0.4mm Pitch, https://www.st.com/resource/en/datasheet/stm32wb15cc.pdf#page=119 ST WLCSP-52, ST die ID 472, 4.36x4.07mm, 81 Ball, 9x9 Layout, 0.4mm Pitch, https://pdfserv.maximintegrated.com/package_dwgs/21-100489.PDF WLCSP-25, 5x5 raster, 2.423x2.325mm package, pitch 0.8mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32l052t8.pdf WLCSP-36, 6x6 raster, 2.605x2.703mm package, pitch 0.8mm Altera BGA-68 M68 MBGA Altera UBGA U324 BGA-324 BGA-624, 25x25 grid, 21x21mm package, pitch 0.65mm UFBGA-32, 6x6, 4x4mm package, pitch 0.4mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32l031f6.pdf WLCSP-25, 5x5 raster, 2.423x2.325mm package.

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