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STMicroelectronics STM32L431CBY7TR — Microcontrollers & Processors (MCU / MPU / DSP)
STMicroelectronics

STM32L431CBY7TR ARM Cortex-M4 MCU, 80MHz, 128KB Flash, WLCSP

MPNSTM32L431CBY7TR
Active

STMicroelectronics STM32L4 series, ARM Cortex-M4 32-bit MCU, 80MHz, 128KB Flash, 64K x 8 RAM, 1.71V~3.6V, 39 I/O, 49-WLCSP, -40°C~105°C.

$6.4800Ref. price · indicative, final on quote
STM32L431CBY7TR datasheet
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Specifications

STM32L431CBY7TR Technical Specifications
ParameterValue
SeriesSTM32L4
Mounting typeSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.71V ~ 3.6V
Operating temperature-40°C~105°C(TA)
Speed80MHz
PackageTape & Reel (TR); Cut Tape (CT)
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
Case49-UFBGA, WLCSP
Data convertersA/D 10x12b; D/A 2x12b
Program memory size128KB (128K x 8)

Product details

80 MHz Cortex-M4 with FPU — compute headroom for sensor fusion and control loops

The STM32L431CBY7TR: The 49-WLCSP package measures 3.14 x 3.13 mm. The 80 MHz Cortex-M4 core includes a single-precision FPU and DSP instructions, giving it the compute margin for sensor fusion, motor-control FOC loops, or audio processing without offloading to a separate DSP. The 128 KB Flash is adequate for mid-complexity application code with a RTOS; the 64 KB SRAM leaves room for several large buffers or a modest heap.

WLCSP package — PCB layout and rework considerations

The 49-WLCSP package requires a fine-pitch PCB footprint and solder-mask-defined pad layout.

Peripheral set — CAN, QSPI, multiple serial interfaces

Connectivity includes CANbus, I²C, SPI, UART/USART, QSPI, SAI, and SWPMI — enough for gateway nodes, multi-sensor aggregators, or human-machine interfaces.

The base product number STM32L431 covers multiple Flash and package variants, so the family roadmap is stable.

Frequently asked questions

What is the equivalent replacement for STM32L431CBY7TR?

The STM32L431CBY7TR is a WLCSP-packaged variant of the STM32L431 family. Pin-compatible alternatives within the same family include the STM32L431CBY6 (same 128 KB Flash, 64 KB SRAM, 49-WLCSP) and other STM32L431 density options. For a direct WLCSP drop-in with identical memory and package, the STM32L431CBY6 is the closest sibling. No official successor part number has been issued since this device is still active.