Item specifics
Description
STM32L431CCT6 Product Overview
STM32L431CCT6 is an Arm Cortex-M4 MCU at 80 MHz with FPU and ART Accelerator, LQFP-48. 256 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 STM32L431CBT6 (128 KB Flash), the STM32L431CCT6 doubles the Flash to 256 KB, offering even more storage for battery-powered IoT nodes, portable devices, and sensor applications needing larger program memory and complex data processing.
STM32L431CCT6 Core Features
Core: The STM32L431CCT6 features an Arm Cortex-M4 core at 80 MHz, with FPU + ART Accelerator
Memory: The STM32L431CCT6 provides 256 KB Flash and 64 KB SRAM (incl. 16 KB with HW parity), offering ample space for complex firmware
USB: The STM32L431CCT6 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: 1×Advanced Timer, multiple GP/LP timers, RTC
I/Os: 39 (5 V-tolerant)
Package: LQFP-48
Temperature Range: -40°C to 85°C
STM32L431CCT6 Applications
IoT Sensor Nodes: Battery-powered wireless sensors and USB data acquisition modules can leverage the STM32L431CCT6's low power and connectivity
Portable Devices: Wearables, portable medical devices, and USB peripherals benefit from the STM32L431CCT6's compact integration
Industrial Metering: Water, gas, and electricity meters are ideal applications for the STM32L431CCT6
Consumer Electronics: Remote controls, e-labels, smart cards
Energy Harvesting Applications: Self-powered sensor nodes and energy harvesting systems can rely on the STM32L431CCT6's ultra-low power consumption
STM32L431CCT6 Key Advantages
Cortex-M4 + FPU + Ultra-Low Power: The STM32L431CCT6 delivers excellent DSP and floating-point performance while maintaining extremely low power consumption
Integrated Crystal-less USB: The STM32L431CCT6 enables USB communication without an external crystal, simplifying design and saving BOM
256 KB Flash + 64 KB SRAM: The STM32L431CCT6 provides large storage for complex protocol stacks and data processing
Dual DACs + Dual Comparators: The STM32L431CCT6 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 STM32L431CCT6 provides high-density connectivity with enhanced noise immunity
Full Ecosystem Compatibility: Easy development with STM32CubeIDE/HAL/LL libraries for the STM32L431CCT6
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FAQ
1. What is STM32L431CCT6?
STM32L431CCT6 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 STM32L431CCT6 provides 256 KB Flash and 64 KB SRAM, along with USB OTG FS, high-precision 12-bit ADC/DAC, and rich low-power modes. By integrating full USB connectivity and high-performance analog peripherals into a hand-solderable 48-pin LQFP package, the STM32L431CCT6 delivers an excellent platform for general-purpose battery-powered devices in prototyping and small-batch production.
2. What are the key specifications of STM32L431CCT6?
Core: Arm® Cortex®-M4, up to 80 MHz, 100 DMIPS with FPU and DSP
Memory: 256 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. What are the advantages of the LQFP-48 package on the STM32L431CCT6, and is it easy to solder?
The LQFP-48 has all pins exposed with a 0.5 mm pitch, making it ideal for hand soldering. Drag-soldering the STM32L431CCT6 with a standard iron is straightforward—no hot-air station or reflow oven required. Compared to the QFN variant (UFQFPN-48), the STM32L431CCT6 offers significant advantages in manual assembly, visual inspection, and rework, making it the preferred choice for prototyping, small-batch production, and educational use.
4. What applications is STM32L431CCT6 suitable for?
With its 48-pin LQFP package, 256 KB Flash, USB connectivity, and excellent power efficiency, the STM32L431CCT6 is ideal for battery-powered devices with moderate code size that require easy hand-soldering and low-cost PCB design. Typical applications include portable medical accessories, wireless sensor nodes, miniature USB devices, industrial handheld terminals, and ultra-compact IoT endpoints needing USB connectivity.
5. How does STM32L431CCT6 differ from STM32L431CCU6?
Both share identical core, memory (256 KB Flash, 64 KB SRAM), and peripherals (USB OTG FS, no CAN/SAI). The only difference is the package type: the STM32L431CCT6 uses LQFP-48 with exposed pins for easy hand soldering and visual inspection, while CCU6 uses UFQFPN-48 with bottom pads, which is smaller but requires reflow soldering. Choose STM32L431CCT6 for better manual handling and serviceability.
6. What's the main difference between STM32L431CCT6 and STM32L432KCU6?
The STM32L431CCT6 offers a 48-pin LQFP package (38 I/Os), 256 KB Flash, and USB OTG FS, but lacks CAN and SAI. The L432KCU6 comes in a 32-pin QFN package (26 I/Os) with fewer I/Os but adds an SAI audio interface. If your project doesn't need digital audio and benefits from more I/Os in an easy-to-solder LQFP package, the STM32L431CCT6 is the better fit.
7. What if my project needs CAN or SAI? Can STM32L431CCT6 support that?
The STM32L431CCT6 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 STM32L431CCT6, 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 BOM cost—evaluate carefully during component selection.
8. Is 64 KB SRAM sufficient when running a USB stack on the STM32L431CCT6, and how can memory be optimized?
The 64 KB SRAM on the STM32L431CCT6 can comfortably run a lightweight RTOS (e.g., FreeRTOS) and standard USB device libraries (CDC, HID). Optimization tips include carefully sizing task stacks, preferring static memory allocation, and leveraging DMA for data transfers to reduce CPU and RAM usage. For applications requiring larger data buffers, external PSRAM or SPI Flash can be added via the Quad SPI interface.
9. Which pins does USB occupy on the STM32L431CCT6 in the 48-pin LQFP package, and does it limit GPIO availability?
USB OTG FS on the STM32L431CCT6 requires D+ (PA12) and D- (PA11) as differential data lines, plus typically VBUS detect (PA9) and ID (PA10), consuming a total of four I/Os. With 38 available I/Os, approximately 34 GPIOs remain for other peripherals after USB is configured—providing ample flexibility. Use STM32CubeMX for pin planning to avoid conflicts.
10. What is the power consumption like on the STM32L431CCT6?
It inherits the STM32L4 series' renowned ultra-low-power performance: Shutdown mode draws only ~33 nA, Standby mode ~125 nA, Stop 2 mode ~1.2 µA (~1.4 µA with RTC), and Run mode ~100 µA/MHz (LDO mode). With multiple low-power modes and fast wake-up, the STM32L431CCT6 is perfectly suited for battery-powered devices demanding long battery life.