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BackWLCSP-64, 8x8 raster, 5x5mm package, pitch 0.4mm; see section 7.4 of http://www.st.com/resource/en/datasheet/stm32f091vb.pdf WLCSP-64, 8x8 raster, 5x5mm.
- , 7 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-4P-1.25DS%2820%29.
- DSS6, http://cdn-reichelt.de/documents/datenblatt/B400/DSN6NC51H.pdf, length*width=7.0x2.5mm^2 package.