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STMicroelectronics STM32L431RBT6 — Microcontrollers & Processors (MCU / MPU / DSP)

STM32L431RBT6 STM32L4 MCU, ARM Cortex-M4, 80 MHz

MPNSTM32L431RBT6
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STMicroelectronics STM32L431RBT6, STM32L4 series, 32-Bit Single-Core ARM Cortex-M4 MCU, 80 MHz, 128 KB Flash, 64K x 8 RAM, 52 I/O, 1.71V-3.6V, -40°C to 85°C, 64-LQFP tray.

$5.8200Ref. price · indicative, final on quote
STMicroelectronics STM32L431RBT6 datasheet (PDF)
Packaging64-LQFP
RoHSROHS3 Compliant
SeriesSTM32L4
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STM32L431RBT6 specifications
ParameterValue
SeriesSTM32L4
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.71V ~ 3.6V
Operating temperature-40°C ~ 85°C (TA)
Speed80MHz
PackageTray
RAM size64K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, PWM, WDT
ConnectivityCANbus, I²C, IrDA, LINbus, MMC/SD, QSPI, SAI, SPI, SWPMI, UART/USART
Number of i (O)52
Core processorARM® Cortex®-M4
Case64-LQFP
Data convertersA/D 16x12b; D/A 2x12b
Program memory size128KB (128K x 8)

Product details

The STM32L431RBT6: ARM Cortex-M4 core runs at 80 MHz with DSP instructions and single-cycle MAC. 128 KB Flash and 64K x 8 RAM support an RTOS, communications, and control loop.

Connectivity and peripherals — industrial and audio-ready

The brown-out detect and reset block keeps the core from running on a marginal supply, which matters for battery-powered gear where the rail sags under load.

The base product number STM32L431 is a mainstream STM32L4 variant, so the supply chain is mature and the part is widely stocked across distribution.

Frequently asked questions

What is the difference between STM32L431RBT6 and STM32L433?

The STM32L433 is a close sibling in the same STM32L4 family, typically adding a TFT-LCD parallel interface and a larger Flash density option. The STM32L431RBT6 has 128 KB Flash and 64K x 8 RAM, while the STM32L433 starts at 256 KB Flash. If you don't need the display controller or the extra memory, the STM32L431RBT6 is the cost-optimized choice.

Is STM32L431RBT6 compatible with the STM32L4 series?

Yes — the STM32L431RBT6 is a member of the STM32L4 series. It shares the same ARM Cortex-M4 core, peripheral set, and low-power architecture as other STM32L4 parts, so code and pin-compatible migration within the series is straightforward.