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Thermal vias, http://www.ti.com/lit/ds/symlink/drv8870.pdf 20-Pin Thermally Enhanced Thin Shrink Small-Outline Package, Body 4.4x6.5x1.1mm, Pad 3.0x4.2mm, Texas Instruments DSBGA BGA YZP R-XBGA-N6 Texas Instruments, DSBGA, 1.43x1.41mm, 8 bump 2x4 (perimeter) array, NSMD pad definition (http://www.ti.com/lit/ds/symlink/txb0104.pdf, http://www.ti.com/lit/wp/ssyz015b/ssyz015b.pdf Texas Instruments, DSBGA, area grid, NSMD pad definition (http://www.ti.com/lit/ml/mxbg270/mxbg270.pdf Texas Instruments, DSBGA, area grid.