The STM32F446MC 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 128 kB, Flash Memory 256 kB, Supply Voltage 1.7 to 3.6 V. Tags: Surface Mount. More details for STM32F446MC can be seen below.