The STM32L4 P5RG/P5RE from STMicroelectronics is a Space Qualified Microcontroller with Clock Rate 32 kHz to 48 MHz, Operating Frequency 120 MHz, Internal RAM Memory SRAM : 320 kB, Flash Memory Up to 1 Mb, Supply Voltage 1.71 to 3.6 V. Tags: Surface Mount. More details for STM32L4 P5RG/P5RE can be seen below.