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BackBody [QFN] with corner pads; see figure 8.2 of https://www.silabs.com/documents/public/data-sheets/efm8bb1-datasheet.pdf 20-Lead Plastic Thin Quad Flatpack No-Lead Package, Body 4.4x6.5x1.1mm, Pad 3.0x4.2mm, Texas Instruments BGA-289, 0.4mm pad, 15x15mm, 289 Ball, 17x17 Layout, 0.8mm Pitch, https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-bga/05081600_0_bga49.pdf https://www.analog.com/media/en/technical-documentation/product-information/assembly-considerations-for-umodule-bga-lga-package.pdf BGA 324 0.8 CS325 CSG235 Spartan-7 BGA, 22x22 grid, 19x19mm package, 0.8mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug865-Zynq-7000-Pkg-Pinout.pdf#page=79, NSMD pad definition (http://www.ti.com/lit/ds/symlink/lm4990.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments (see http://www.ti.com/lit/ds/symlink/lm5118.pdf.
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