The STM32F427Ix from STMicroelectronics is a Space Qualified Microcontroller with Clock Rate 32 kHz to 26 MHz, Operating Frequency 180 MHz, Internal RAM Memory SRAM : 4 to 256 kB, Flash Memory 1024 to 2048 kB, Supply Voltage 1.8 to 3.6 V. Tags: Surface Mount. More details for STM32F427Ix can be seen below.