MK21FX512VMC12 , ARM® Cortex®-M4 Kinetis K20 Microcontroller IC 32-Bit 120MHz 512KB (512K x 8) FLASH 121-MAPBGA (8x8). we specialize in Freescale Semiconductor, Inc. MK21FX512VMC12 electronic components. MK21FX512VMC12 can be shipped within 24 hours after order.