The STM32H7A3IIT from STMicroelectronics is a Space Qualified Microcontroller with Clock Rate 32 kHz to 64 MHz, Operating Frequency 280 MHz, Internal RAM Memory SRAM : 4 to 1024 kB, TCM RAM : 64 to 128 kB, Flash Memory 2048 kB, Supply Voltage 1.62 to 3.6 V. Tags: Surface Mount. More details for STM32H7A3IIT can be seen below.