EmbeddedRelated.com
The 2026 Embedded Online Conference
    Parts    STM32L431KCU6
STM32L431KCU6

STM32L431KCU6

STMicroelectronics
ARM® Cortex®-M4 STM32L4 Microcontroller IC 32-Bit 80MHz 256KB (256K x 8) FLASH 32-UFQFPN (5x5)
Active4,370 in stock
Datasheet Digi-Key Compare Prices

Overview

The STM32L431KCU6 is an ultra-low-power microcontroller based on the ARM Cortex-M4 core with a Floating Point Unit (FPU) and DSP instructions. It operates at up to 80MHz and is designed for applications requiring high performance and low power consumption, featuring 256KB of Flash and 64KB of RAM in a compact 32-pin UFQFPN package.

Why Choose This Part

This MCU provides a highly flexible power architecture with eight distinct low-power modes, including a Shutdown mode consuming only 10nA. Its FlexPowerControl system and Batch Acquisition Mode (BAM) allow for efficient data processing and peripheral usage even while the core is in sleep.

Applications

Battery-Powered Wearables
Ideal for fitness trackers and smartwatches due to its 0.01uA shutdown current and 0.028uA standby current.
Industrial Sensor Nodes
Leverages its 10x12-bit ADC and 2x12-bit DAC for high-precision data acquisition in remote monitoring systems.
Smart Building Automation
Supports LINbus, CANbus, and I2C for integration into wired building control networks while maintaining low energy footprints.
Portable Medical Devices
The FPU and DSP capabilities allow for local processing of biometric data while the ART Accelerator optimizes execution efficiency.

Key Specifications

Speed 80MHz
RAM Size 64K x 8
Core Size 32-Bit
Peripherals Brown-out Detect/Reset, DMA, PWM, WDT
Connectivity CANbus, I2C, IrDA, LINbus, QSPI, SAI, SPI, SWPMI, UART/USART
Mounting Type Surface Mount
Number of I/O 26
Core Processor ARM Cortex-M4
Package / Case 32-UFQFN Exposed Pad
Data Converters A/D 10x12b; D/A 2x12b
Oscillator Type Internal
Program Memory Size 256KB (256K x 8)
Program Memory Type FLASH
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 32-UFQFPN (5x5)
Voltage - Supply (Vcc/Vdd) 1.71V ~ 3.6V

Getting Started

Engineers can begin development using the STM32CubeIDE ecosystem and the STM32CubeL4 software package. For hardware prototyping, look for NUCLEO-L432KC or similar boards that utilize the STM32L4 series in a small form factor.

Dev Boards

Development boards and breakout modules featuring the STM32L431KCU6 or compatible chips — ready to use for prototyping.

NUCLEO-L432KC STMicroelectronics
Development Boards & Kits - ARM STM32 Nucleo-32 dev board STM32L432KC, supports Arduino nano conn
Digi-Key Mouser 2,384 in stock
NUCLEO-L476RG STMicroelectronics
Development Boards & Kits - ARM STM32 Nucleo-64 development board STM32L476RG MCU, supports Arduino & ST morpho
Digi-Key Mouser 3,059 in stock

STM32L431 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number I/O Pins Package Flash Stock
STM32L431KCU6 (this part) 26 UFQFN-32 256KB 4,370
STM32L431CCT6TR Tape & Reel 39 LQFP-48 256KB 2,090
STM32L431CCU6 39 UFQFN-48 256KB 4,536
STM32L431CBT6 39 LQFP-48 128KB 8,177
STM32L431CCU6TR Tape & Reel 39 UFQFN-48 256KB 2,696
STM32L431CCY6TR Tape & Reel 39 UFBGA-49 256KB 4,345

Also Consider

STM32L432KCU6 STMicroelectronics - Adds a USB 2.0 crystal-less device interface for applications requiring PC connectivity.
The 2026 Embedded Online Conference