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STMicroelectronics STM32L431RCT6 — Microcontrollers & Processors (MCU / MPU / DSP)

STM32L431RCT6 STMicroelectronics MCU, 80MHz Cortex-M4

MPNSTM32L431RCT6
Active

STMicroelectronics STM32L4 series, STM32L431RCT6, ARM Cortex-M4 32-Bit Single-Core MCU, 80MHz, 256KB Flash, 64K x 8 RAM, CAN/I²C/SPI/USART, 52 I/O, 64-LQFP, -40°C to 85°C.

$6.6100Ref. price · indicative, final on quote
STMicroelectronics STM32L431RCT6 datasheet (PDF)
Packaging64-LQFP
RoHSROHS3 Compliant
SeriesSTM32L4
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STM32L431RCT6 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 size256KB (256K x 8)

Product details

80 MHz Cortex-M4 with 256 KB Flash — what this means for the BOM

The STM32L431RCT6: It belongs to the STM32L4 ultra-low-power series, designed for applications where active compute throughput and standby current both matter — think sensor-fusion nodes, battery-operated industrial controllers, and communication gateways that need to run a real-time OS and still hit years of coin-cell life.

Industrial temperature grade and where this part lives

That 85°C ceiling covers most commercial and light-industrial deployments.

Connectivity and peripheral set — what is on the bus

This MCU carries CANbus, I²C, IrDA, LINbus, MMC/SD, QSPI, SAI, SPI, SWPMI, and UART/USART interfaces. The QSPI interface is worth calling out: it lets you attach external serial Flash or PSRAM for data logging or OTA staging without chewing up GPIO for a parallel bus.

The ROHS3 compliance is confirmed on the product marking, so it passes EU and global restricted-substance requirements without a waiver.

Package and mounting — 64-LQFP footprint details

A formal RFQ is the fastest way to lock a price break and delivery window for your BOM line.

Frequently asked questions

What is the maximum operating frequency of STM32L431RCT6?

That 80 MHz ceiling gives enough throughput for real-time sensor fusion, PID loops, and protocol stacks without needing an external crystal for the core clock.

What is the equivalent part to STM32L431RCT6?

A functional peer within ST's portfolio is the STM32L151CBU6A, which uses an ARM Cortex-M3 core at 32 MHz with similar peripheral set (I²C, SPI, UART, USB) and the same 12-bit ADC/DAC resolution. The STM32L431RCT6 offers roughly 2.5x the core clock speed and a richer connectivity set including CAN and QSPI, so the choice depends on whether your firmware needs the Cortex-M4 DSP extensions and higher throughput.