The STM32F100Zx from STMicroelectronics is a Space Qualified Microcontroller with Clock Rate 32 kHz to 24 MHz, Operating Frequency 24 MHz, Internal RAM Memory SRAM : 24 to 32 kB, Flash Memory 256 to 512 kB, Supply Voltage 2 to 3.6 V. Tags: Surface Mount. More details for STM32F100Zx can be seen below.