The STM32WLE5Jx STM32WLE4Jx from STMicroelectronics is a Space Qualified Microcontroller with Clock Rate 32 kHz to 16 MHz, Operating Frequency 48 MHz, Internal RAM Memory SRAM : 16 to 32 KB, Flash Memory 64 to 256 KB, Supply Voltage 1.8 to 3.6 V. Tags: Surface Mount. More details for STM32WLE5Jx STM32WLE4Jx can be seen below.