The STM32L15xCx from STMicroelectronics is a Space Qualified Microcontroller with Clock Rate 32 kHz to 24 MHz, Operating Frequency 32 MHz, Internal RAM Memory 4 kB, Flash Memory 32 to 128 kB, Internal ROM Memory 10 to 16 kB. Tags: Surface Mount. More details for STM32L15xCx can be seen below.