MK51DX256CMC10 (Active)
Kinetis K51: 100MHz Cortex-M4 Measurement MCU, 512KB Flash, 64KB SRAM, USB, Segment LCD, 121-MAPBGA

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Package
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LFBGA121, plastic, low profile fine-pitch ball grid array; 121 bumps; 0.65 mm pitch; 8 mm x 8 mm x 1.38 mm body