The STM32L431KBU6TR is an STMicroelectronics 32-bit ARM Cortex-M4 MCU clocked at 80 MHz, with 128 KB of Flash and 64 KB of SRAM. It sits in the STM32L4 ultra-low-power series, designed for applications where active current and wake-up latency matter — think battery-operated sensors, portable medical gear, or field instruments that run on a coin cell for months.
The 80 MHz core with single-cycle multiply and a hardware FPU handles sensor fusion or PID loops without loading the CPU.
Housed in a 32-lead UFQFPN with exposed pad, 5×5 mm footprint. The industrial temperature range covers outdoor telecom cabinets, engine-bay-adjacent controllers, and factory-floor enclosures without active cooling.