The STM32F 373Rx from STMicroelectronics is a Space Qualified Microcontroller with Clock Rate 32 kHz to 32 MHz, Operating Frequency 72 MHz, Internal RAM Memory SRAM : 16 to 32 kB, Flash Memory 64 to 256 KB, Supply Voltage 2 to 3.6 V. Tags: Surface Mount. More details for STM32F 373Rx can be seen below.