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STMicroelectronics STM32L431CBT6 — Microcontrollers & Processors (MCU / MPU / DSP)

STM32L431CBT6 MCU, ARM Cortex-M4 80 MHz, 128 KB Flash

MPNSTM32L431CBT6
Active

STMicroelectronics STM32L4 series ARM Cortex-M4 MCU, 32-bit, 80 MHz, 128 KB Flash, 64 KB SRAM, 48-LQFP, tray.

$6.3900Ref. price · indicative, final on quote
STMicroelectronics STM32L431CBT6 datasheet (PDF)
Packaging48-LQFP
RoHSROHS3 Compliant
SeriesSTM32L4
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STM32L431CBT6 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, QSPI, SAI, SPI, SWPMI, UART/USART
Number of i (O)39
Core processorARM® Cortex®-M4
Case48-LQFP
Data convertersA/D 10x12b; D/A 2x12b
Program memory size128KB (128K x 8)

Product details

Core compute and memory headroom

The STM32L431CBT6 is an ARM Cortex-M4 core running at 80 MHz — the 32-bit single-core pipeline delivers the throughput needed for real-time control loops and sensor fusion without an external DSP. Program memory is 128 KB of Flash (128K x 8), backed by 64 KB of SRAM (64K x 8). That memory map supports moderate firmware images with a few hundred KB of data buffers — enough for a CANopen node or a multi-sensor data logger.

Peripheral set for mixed-signal and fieldbus integration

39 general-purpose I/O lines in the 48-LQFP package leave enough pins for a keypad, status LEDs, and a few external interrupts alongside the serial buses.

Frequently asked questions

Where can I buy STM32L431CBT6 and how do I get a price?

This MCU is sourced to order against your BOM quantity through independent distribution. Submit an RFQ for current pricing and lead-time confirmation — availability is verified at quote time.

Will STM32L431CBT6 drop into a board designed for STM32L151CBU6A?

No — the STM32L151CBU6A uses a Cortex-M3 core at 32 MHz and comes in a different package (UFQFPN-48 vs LQFP-48). The pinout, supply voltage (1.8 V typical vs 1.71-3.6 V), and peripheral set differ significantly. A board spin is required.