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STMicroelectronics STM32L431CBT6
- Part No.:
- STM32L431CBT6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM32L431CBT6.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:20,253
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Product details
Overview
STM32L431CBT6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz, featuring 128 KB Flash, 40 KB SRAM (including 16 KB with hardware parity), and integrated analog peripherals including a 12-bit 5 Msps ADC, dual 12-bit DACs, op-amp with PGA, and two ultra-low-power comparators. It targets battery-powered IoT sensors, portable medical devices, and energy-harvesting systems requiring sub-µA standby operation and robust mixed-signal integration.
For engineers reviewing the STM32L431CBT6 datasheet, STM32L431CBT6 pinout, STM32L431CBT6 application, or STM32L431CBT6 equivalent, key selection criteria include its 8 nA shutdown current, 4 µs wakeup from Stop mode, LQFP48 package with 37 I/Os (most 5 V-tolerant), CAN 2.0B interface, and support for Batch Acquisition Mode (BAM) in low-power audio sensing applications.
Technical Context
The STM32L431CBT6 implements an Arm Cortex-M4 core with FPU and Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from Flash at 80 MHz. Its power architecture includes five low-power modes-Shutdown (8 nA), Standby (28 nA), Stop 2 (1.0 µA), and Run (84 µA/MHz)-with dedicated wakeup sources including LPUART and RTC alarms.
Analog subsystem integration includes independent supply domains for the 12-bit ADC (5 Msps, hardware oversampling to 16-bit), dual DACs with sample-and-hold, one rail-to-rail op-amp with programmable gain amplifier (PGA), and two comparators with window mode-all operable in Stop 2 mode for always-on sensor monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU, 80 MHz max frequency, 100 DMIPS, ART Accelerator for zero-wait-state Flash execution |
| Memory | 128 KB Flash (single bank, code readout protection), 40 KB SRAM (16 KB with hardware parity) |
| Power Consumption | 8 nA Shutdown mode; 1.0 µA Stop 2 mode; 84 µA/MHz Run mode; 4 µs wakeup from Stop |
| Analog Peripherals | 1× 12-bit 5 Msps ADC (16-bit via oversampling), 2× 12-bit DACs, 1× op-amp with PGA, 2× ultra-low-power comparators |
| Communication | 3× I²C (FM+, 1 Mbit/s), 4× USART (ISO 7816/LIN/IrDA), 1× LPUART, 3× SPI, 1× SAI, 1× CAN 2.0B, 1× SDMMC |
| Timers & Clock | 11 timers including advanced TIM1, 2× low-power LPTIMs, RTC with HW calendar, dual PLLs (system/audio/ADC) |
| Package & I/O | LQFP48 (7×7 mm), 37 general-purpose I/Os (most 5 V-tolerant), SWD/JTAG debug interface |
Pinout & Package
LQFP48 package (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad; 48-pin quad flat pack suitable for automated assembly and thermal management in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power supply and ground | 1.71–3.6 V operation; separate analog/digital ground pins (VSSA/VSS) enable noise isolation for precision ADC/DAC |
| PA0–PA15, PB0–PB15, PC13–PC15 | General-purpose I/Os | 37 total GPIOs; most support 5 V tolerance, multiple alternate functions (USART, SPI, I²C, TIM), configurable pull-up/down |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external reset button or supervisor IC assertion |
| BOOT0 | Boot mode selection | High at power-up selects system memory bootloader; used for factory programming or recovery without debugger |
| SWCLK, SWDIO | Serial Wire Debug interface | 2-pin debug port replacing JTAG; enables full SWD debugging, flash programming, and real-time trace via Embedded Trace Macrocell™ |
| VREF+ | Analog reference voltage input | Optional external reference for ADC/DAC; improves accuracy vs. internal VREFINT (1.2 V ±1%) |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Five distinct low-power modes with validated current specs: 8 nA Shutdown, 28 nA Standby, 1.0 µA Stop 2 - enabling multi-year battery life in sensor nodes |
| Batch Acquisition Mode (BAM) | Enables autonomous ADC sampling and DMA transfer while CPU remains in Stop mode - critical for ultra-low-power audio or vibration monitoring |
| Integrated analog front-end | Single-chip solution combining 12-bit 5 Msps ADC, dual DACs, op-amp with PGA, and two comparators - eliminates 4–6 external components in sensor signal chains |
| CAN 2.0B + LPUART | On-chip CAN transceiver interface and low-power UART with Stop 2 wakeup - supports industrial fieldbus and battery-backed remote telemetry |
| Hardware security | Firewall, memory protection unit (MPU), CRC engine, 96-bit unique ID, and optional readout protection (RDP) - meets basic firmware integrity requirements |
Applications
| Wearable Health Monitor | Smart Gas Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG/PPG acquisition with motion artifact compensation and BLE transmission during periodic wakeups. IC Role / Device Role / Timing Role: Main controller executing signal processing on Cortex-M4+FPU, managing ADC oversampling, DMA transfers, and LPUART-triggered wakeup from Stop 2. Use Value: 1.0 µA Stop 2 current and 4 µs wakeup enable >30-day battery life on coin cell; integrated op-amp and PGA condition analog sensor signals without external amplification. |
Use Scenario: Battery-powered CO/NH₃ detection using electrochemical sensors, with periodic calibration and wireless alert transmission. IC Role / Device Role / Timing Role: Analog signal conditioner (op-amp + DAC for bias control), ADC digitizer, and CAN/LPUART gateway interfacing with central hub. Use Value: Dual ultra-low-power comparators monitor sensor thresholds in Standby mode (28 nA); RTC alarm triggers hourly measurement cycle without CPU intervention. |
| Energy-Harvesting Remote Controller | Portable Diagnostic Instrument |
|
Use Scenario: Solar- or RF-harvested power management for HVAC remote control with touch sensing and IR transmission. IC Role / Device Role / Timing Role: Touch sensing controller (TSC) for 21-channel capacitive buttons, SAI-driven audio feedback, and IRTIM infrared transmitter. Use Value: Integrated TSC eliminates external touch controller; 8 nA Shutdown mode preserves harvested energy between user interactions; 5 V-tolerant I/Os interface directly with legacy IR LEDs. |
Use Scenario: Handheld blood glucose or pH meter requiring precise analog measurement, data logging, and USB-C connectivity. IC Role / Device Role / Timing Role: Precision analog front-end (12-bit ADC + VREF+ input + temperature sensor), SRAM-based data buffer, and USB-capable SAI/USART interface. Use Value: Hardware parity on 16 KB SRAM ensures data integrity during logging; internal temperature sensor (±1.5°C) enables automatic ADC offset correction across operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L432KBT6 | 64 KB Flash, 16 KB SRAM, no CAN, includes USB 2.0 FS device interface | Better suited for USB-connected portable instruments; lacks CAN for industrial fieldbus use | Select when USB host/device capability is required and CAN is unnecessary |
| STM32L476RGY6TR | 1 MB Flash, 128 KB SRAM, LCD controller, higher peripheral count, QFN64 package | Targeted at feature-rich HMI displays; larger footprint and higher active current (102 µA/MHz) | Choose for complex GUI or extended connectivity; avoid if size/power budget is constrained |
Compared with STM32L432KBT6, the STM32L431CBT6 offers CAN and larger memory for fieldbus edge nodes; versus STM32L476RGY6TR, it delivers 30% lower active current and smaller LQFP48 footprint-critical for compact, battery-limited designs.
Availability
STM32L431CBT6 is available at Aetrix Electronics and suitable for wearable health monitors, smart gas sensor nodes, and energy-harvesting remote controllers requiring stable component supply and long-term manufacturability.
Supply support for STM32L431CBT6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and automotive semiconductors.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance per µA, with design focus on battery longevity, analog integration, and secure firmware execution for IoT endpoints and portable medical devices.
FAQ
What is the maximum operating frequency and core type of the STM32L431CBT6?
The STM32L431CBT6 features an Arm Cortex-M4 core with FPU, rated for up to 80 MHz operation. It achieves 100 DMIPS and 3.42 CoreMark/MHz at this frequency, enabled by the Adaptive Real-time Accelerator (ART™) that eliminates Flash wait states. The core includes a Memory Protection Unit (MPU) and supports DSP instructions for efficient signal processing in sensor applications.
Does the STM32L431CBT6 support hardware cryptographic acceleration?
No, the STM32L431CBT6 does not include dedicated hardware cryptographic accelerators (e.g., AES, SHA, PKA). It relies on software libraries for encryption tasks. For hardware-accelerated crypto, ST's STM32L5 or STM32U5 series are recommended alternatives with integrated AES-256, PKA, and secure boot engines compliant with PSA Level 3.
What low-power modes are available, and what is the lowest achievable current?
The STM32L431CBT6 offers five low-power modes: Shutdown (8 nA), Standby (28 nA), Stop 2 (1.0 µA), Stop 1 (1.28 µA with RTC), and Stop 0 (1.7 µA). Shutdown mode retains only RTC and 32×32-bit backup registers powered by VBAT. All modes support configurable wakeup sources including EXTI pins, RTC alarms, LPUART, and comparator events.
Is the LQFP48 package RoHS-compliant and lead-free?
Yes, the STM32L431CBT6 in LQFP48 package is RoHS-compliant and lead-free, meeting EU Directive 2011/65/EU. It carries ST's ECOPACK2® designation, confirming compliance with environmental standards including halogen-free materials and strict limits on hazardous substances such as cadmium, mercury, and hexavalent chromium.
STM32L431CBT6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- Series:
- STM32L4
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit Single-Core
- Speed:
- 80MHz
- Connectivity:
- CANbus, I2C, IrDA, LINbus, QSPI, SAI, SPI, SWPMI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 39
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 64K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 10x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L431CBT6 FAQ
1.How can I place an order for STM32L431CBT6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L431CBT6 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32L431CBT6 reliable?
The price and inventory of STM32L431CBT6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L431CBT6 is usually 5 days.
3.What payment methods are accepted for STM32L431CBT6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L431CBT6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L431CBT6?
STM32L431CBT6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L431CBT6 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32L431CBT6?
For technical support, including STM32L431CBT6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L431CBT6 requirements.
6.How does Aetrix verify that STM32L431CBT6 is sourced from the original manufacturer or authorized distributors?
All STM32L431CBT6 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32L431CBT6 meets industry standards.
7.What is the process for return or replacement of STM32L431CBT6?
All STM32L431CBT6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L431CBT6, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32L431CBT6 part is unused and in its original packaging.
Return procedure for STM32L431CBT6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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