Item specifics
Description
STM32L431CBT6 Product Overview
STM32L431CBT6 is an Arm Cortex-M4 MCU at 80 MHz with FPU and ART Accelerator, LQFP-48. 128 KB Flash, 64 KB SRAM, USB 2.0 FS device (crystal-less), 12-bit ADC (10 ch), two 12-bit DACs, two comparators, LP timers, RTC, 2×USART, 1×UART, 1×LPUART, 2×SPI/I2S, 2×I2C. Up to 39 x 5 V-tolerant I/Os. 1.71–3.6 V, -40–85 °C. Compared to the L412 series, the STM32L431CBT6 boosts SRAM to 64 KB and adds DAC and LPUART, delivering a more powerful ultra-low-power platform for battery-powered IoT nodes and portable devices needing stronger data processing, analog output, and flexible communication.
STM32L431CBT6 Core Features
Core: The STM32L431CBT6 features an Arm Cortex-M4 core at 80 MHz, with FPU + ART Accelerator
Memory: The STM32L431CBT6 provides 128 KB Flash and 64 KB SRAM, offering a balanced combination for embedded applications
USB: The STM32L431CBT6 integrates a USB 2.0 FS device (crystal-less)
Analog: 12-bit ADC (10 ch), 2×12-bit DACs, 2×Comparators
Connectivity: 2×USART, 1×UART, 1×LPUART, 2×SPI/I2S, 2×I2C
Timers: Advanced Timer, GP/LP Timers, RTC
I/Os: 39 (5 V-tolerant)
Package: LQFP-48
Temperature Range: -40°C to 85°C
STM32L431CBT6 Applications
IoT Sensor Nodes: Battery-powered wireless sensors and USB data acquisition modules can leverage the STM32L431CBT6's low power and connectivity
Portable Devices: Wearables, portable medical devices, and USB peripherals benefit from the STM32L431CBT6's compact integration
Industrial Metering: Water, gas, and electricity meters are ideal applications for the STM32L431CBT6
Consumer Electronics: Remote controls, e-labels, smart cards
Energy Harvesting Applications: Self-powered sensor nodes and energy harvesting systems can rely on the STM32L431CBT6's ultra-low power consumption
STM32L431CBT6 Key Advantages
Cortex-M4 + FPU + Ultra-Low Power: The STM32L431CBT6 delivers excellent DSP and floating-point performance while maintaining extremely low power consumption
Integrated Crystal-less USB: The STM32L431CBT6 enables USB communication without an external crystal, simplifying design and saving BOM
128 KB Flash + 64 KB SRAM: The STM32L431CBT6 provides ample storage for complex programs and data processing
Dual DACs + Dual Comparators: The STM32L431CBT6 offers flexible analog output and signal threshold detection without external components
LPUART Low-Power Serial Interface: Supports asynchronous communication in low-power modes, further optimizing system power consumption
39 x 5 V-tolerant I/Os in LQFP-48: The STM32L431CBT6 provides high-density connectivity with enhanced noise immunity
Full Ecosystem Compatibility: Easy development with STM32CubeIDE/HAL/LL libraries for the STM32L431CBT6
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FAQ
1. What is STM32L431CBT6?
STM32L431CBT6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L4 series, built around an Arm® Cortex®-M4 core with FPU and DSP in an LQFP-48 package (7 mm × 7 mm). Running at 80 MHz, the STM32L431CBT6 provides 128 KB Flash and 64 KB SRAM, along with USB OTG FS, high-precision 12-bit ADC/DAC, and rich low-power modes. As a Flash-reduced variant of the STM32L431CCT6, the STM32L431CBT6 offers a more cost-effective option for compact battery-powered devices with moderate code size while retaining the hand-solderable LQFP package.
2. What are the key specifications of STM32L431CBT6?
Core: Arm® Cortex®-M4, up to 80 MHz, 100 DMIPS with FPU and DSP
Memory: 128 KB Flash, 64 KB SRAM
Operating Voltage: 1.71 V to 3.6 V
Temperature Range: -40 °C to +85 °C (industrial grade)
I/O Count: up to 38
Package: LQFP-48 (7 mm × 7 mm)
3. Is the LQFP-48 package on the STM32L431CBT6 easy to solder?
The LQFP-48 has all pins exposed with a 0.5 mm pitch, making drag-soldering the STM32L431CBT6 with a standard iron straightforward—no hot-air station or reflow oven required. Compared to QFN packages, it offers significant advantages in hand assembly, visual inspection, and rework, making the STM32L431CBT6 ideal for prototyping, small-batch production, and field repairs.
4. What applications is STM32L431CBT6 suitable for?
With 128 KB Flash, USB connectivity, and excellent power efficiency, the STM32L431CBT6 is ideal for battery-powered devices with moderate code size, such as portable medical accessories, wireless sensor nodes, miniature USB dongles, industrial handheld terminals, and ultra-compact IoT endpoints requiring USB. The 128 KB Flash of the STM32L431CBT6 easily accommodates a lightweight RTOS and basic communication stacks.
5. What development tools support STM32L431CBT6?
ST provides free STM32CubeMX for graphical configuration and STM32CubeIDE as an integrated development environment for the STM32L431CBT6, along with the STM32CubeL4 firmware library. Debugging and programming use ST-Link debuggers. Compatible NUCLEO boards (e.g., NUCLEO-L432KC) with similar peripheral architecture and package dimensions offer a fast path for prototyping and code migration for the STM32L431CBT6.
6. What is the power consumption of the STM32L431CBT6 across its low-power modes?
Temperature Range: -40 °C to +85 °C
Ultra-low-power modes of the STM32L431CBT6:
Shutdown mode: ~33 nA (5 wake-up pins)
Standby mode: ~125 nA (5 wake-up pins), ~430 nA with RTC
Stop 2 mode: ~1.2 µA, ~1.4 µA with RTC
Run mode: ~100 µA/MHz (LDO mode)
7. How does STM32L431CBT6 differ from STM32L431CCT6?
Both share the same LQFP-48 package, pinout, peripherals, 80 MHz Cortex-M4 core, and 64 KB SRAM. The only difference is Flash capacity: the STM32L431CBT6 has 128 KB, while CCT6 has 256 KB. If your firmware fits within 128 KB, the STM32L431CBT6 delivers identical performance and features at a more cost-effective price point, making it the ideal choice for cost-conscious designs.
8. What key peripheral interfaces does STM32L431CBT6 offer?
The STM32L431CBT6 provides the following key peripherals:
Communication: I²C, SPI, UART/USART, USB OTG FS
Analog: 12-bit 5 Msps ADC, 12-bit DAC, ultra-low-power comparators
Timers: 16-bit and 32-bit general-purpose timers, advanced motor-control timer
Others: Quad SPI interface, capacitive touch sensing channels
9. Can 128 KB Flash on the STM32L431CBT6 accommodate a USB stack and sensor drivers? Is it sufficient?
Absolutely. The 128 KB of Flash on the STM32L431CBT6 can comfortably accommodate a lightweight RTOS (such as FreeRTOS), USB device libraries (CDC, HID), common sensor drivers, and moderately complex control logic. If you need to store large fixed data like calibration tables or audio samples, you can use the Quad SPI interface to connect a low-cost external SPI Flash, offloading non-volatile data and freeing up internal Flash on the STM32L431CBT6 for code.
10. What if my project needs CAN or SAI? Can STM32L431CBT6 support that?
The STM32L431CBT6 does not include native CAN or SAI controllers. If these interfaces are essential, consider the STM32L432 (with SAI) or STM32L433 (with both CAN and SAI). If you must use the STM32L431CBT6, you could add an external CAN controller (e.g., MCP2515) via SPI or an external audio codec via I2S/SPI, but this will increase circuit complexity and cost—so evaluate carefully during component selection.