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STMicroelectronics STM32L431KBU6TR
- Part No.:
- STM32L431KBU6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L431KBU6TR.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,321
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Product details
Overview
STM32L431KBU6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 256 KB Flash, 64 KB SRAM, and integrated analog peripherals including a 12-bit 5 Msps ADC, dual 12-bit DACs, and an operational amplifier. It supports batch acquisition mode (BAM) and achieves 8 nA shutdown current, making it suitable for battery-powered IoT sensor nodes requiring long runtime and real-time signal processing.
For engineers reviewing the STM32L431KBU6TR datasheet, STM32L431KBU6TR pinout, STM32L431KBU6TR application, or STM32L431KBU6TR equivalent, key selection criteria include ultra-low-power mode timing (4 µs wakeup from Stop), RTC+calendar support, 5 V-tolerant I/Os, and compatibility with ST's STM32Cube ecosystem for rapid firmware development and power profiling.
Technical Context
The device integrates an Adaptive Real-Time Accelerator (ART™) enabling zero-wait-state execution from Flash at 80 MHz, alongside a memory protection unit (MPU) and interconnect matrix for deterministic peripheral access. Its FlexPowerControl architecture delivers multiple low-power modes - Shutdown (8 nA), Standby (28 nA), Stop 2 (1.0 µA), and Run (84 µA/MHz) - with hardware-calibrated voltage references and BOR circuitry.
It features dual PLLs (system/audio), two ultra-low-power comparators, one opamp with built-in PGA, and 21 capacitive sensing channels. Communication includes CAN 2.0B, SAI, LPUART (Stop 2 wake-up), SWPMI, and SDMMC - all supported by a 14-channel DMA controller and true random number generator for secure boot and cryptographic operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU, 80 MHz max, 100 DMIPS - enables real-time DSP and control algorithms without external co-processor. |
| Memory | 256 KB Flash (single-bank, code readout protection), 64 KB SRAM (16 KB with parity) - supports secure firmware storage and robust data integrity in safety-critical tasks. |
| Power Consumption | 8 nA Shutdown, 28 nA Standby, 1.0 µA Stop 2 - extends coin-cell or energy-harvesting battery life to multi-year operation. |
| Analog Peripherals | 1×12-bit 5 Msps ADC (16-bit oversampling), 2×12-bit DACs, 1×OPAMP+PGA, 2×ULP comparators - enables high-fidelity sensor signal conditioning and closed-loop analog control. |
| Timers & RTC | 11 timers including advanced motor-control TIM1, 2×low-power LPTIMs, HW calendar RTC with calibration - supports precise timekeeping, PWM generation, and wake-up scheduling in sleep states. |
| I/O & Interfaces | Up to 83 fast I/Os (most 5 V-tolerant), CAN 2.0B, SAI, 4×USART, LPUART, 3×SPI, QuadSPI, SWPMI - provides flexible connectivity for industrial sensors, audio edge nodes, and wired/wireless gateways. |
| Package | UFQFPN32 (5 × 5 mm, 0.5 mm pitch) - compact footprint ideal for space-constrained portable medical and wearable devices. |
Pinout & Package
STM32L431KBU6TR uses the UFQFPN32 package: 32-pin, 5 × 5 mm body, 0.5 mm pitch, exposed thermal pad, RoHS-compliant and ECOPACK2® certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Core & I/O power supply / ground | Dual-supply domains enable independent regulation of digital core (1.71–3.6 V) and analog peripherals for noise isolation. |
| VREF+, VREF− | Analog reference inputs | Allow external precision reference for ADC/DAC, improving measurement accuracy beyond internal 1.2 V VREFINT. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD2 | General-purpose I/Os | 83 total GPIOs; most are 5 V-tolerant, supporting direct interfacing with legacy logic and industrial sensors without level shifters. |
| BOOT0 | Boot mode selection | High at reset selects system memory bootloader - enables field firmware recovery via USART without debugger. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; compatible with external reset supervisors and push-button recovery circuits. |
| VBAT | RTC & backup register supply | Accepts 1.65–3.6 V; maintains RTC/calendar and 32×32-bit backup registers during main power loss (200 nA quiescent). |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables 8 nA shutdown and 4 µs wakeup from Stop - critical for duty-cycled sensor nodes with sub-second event response. |
| ART Accelerator™ | Zero-wait-state Flash execution at 80 MHz - eliminates CPU stalls during interrupt-driven real-time control loops. |
| Capacitive touch sensing (TSC) | 21-channel hardware-accelerated touch controller - supports up to 10 touchkeys or rotary sliders without CPU overhead. |
| True Random Number Generator (RNG) | FIPS-compliant entropy source - required for secure key generation in TLS/DTLS stacks and device attestation. |
| Batch Acquisition Mode (BAM) | Permits autonomous ADC sampling and DMA transfer while CPU sleeps - reduces active time by >90% in periodic sensor logging. |
Applications
| Smart Wearable Health Monitor | Industrial Wireless Sensor Node |
|---|---|
Use Scenario: Continuous ECG/PPG signal acquisition with on-device filtering and BLE transmission. IC Role / Device Role / Timing Role: Main controller executing real-time FIR filtering, managing ultra-low-power ADC/DAC/OPAMP chain, and synchronizing BLE stack wakeups via LPTIM. Use Value: 280 nA Standby with RTC ensures hourly health snapshot uploads; 12-bit ADC + hardware oversampling achieves clinical-grade SNR without external signal chain. | Use Scenario: Battery-powered vibration/temperature node in predictive maintenance systems, reporting via LoRaWAN. IC Role / Device Role / Timing Role: Sensor hub aggregating data from MEMS accelerometer and thermistor, performing FFT preprocessing, then waking radio only on anomaly detection. Use Value: BAM + 84 µA/MHz Run mode minimizes energy per inference cycle; CAN interface allows local daisy-chain diagnostics in machinery cabinets. |
| Portable Medical Diagnostic Device | Energy-Harvesting Smart Meter Interface |
Use Scenario: Handheld blood glucose meter with electrochemical sensor interface and LCD display. IC Role / Device Role / Timing Role: Precision analog front-end controller using OPAMP+PGA for transimpedance amplification, dual DAC for reference generation, and RTC for timestamped test logs. Use Value: Internal 1.2 V VREFINT calibrated to ±0.5% enables <1% glucose concentration error; 5 V-tolerant I/Os drive standard LCD modules directly. | Use Scenario: Solar-powered utility meter communicating via NB-IoT, harvesting micro-watts from ambient light. IC Role / Device Role / Timing Role: System-on-chip managing energy harvesting PMIC, supercap charging, RTC-triggered meter reads, and secure OTA updates. Use Value: 200 nA VBAT mode sustains RTC across weeks of no light; true RNG + CRC unit ensures firmware signature validation under intermittent power. |
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 |
|---|---|---|---|
| STM32L431CBU6 | Same core/peripherals but 128 KB Flash, 40 KB SRAM; identical UFQFPN32 package and pinout. | Suitable for cost-sensitive designs with smaller firmware footprints and reduced RAM needs. | Select when application firmware fits within 128 KB and does not require full 256 KB for future feature expansion or OTA dual-bank updates. |
| STM32L433RCT6 | LQFP64 package, adds USB 2.0 FS OTG PHY and enhanced crypto (AES-256, PKA), but lacks SAI and SDMMC. | Better for USB-connected edge devices needing host/device capability and stronger security acceleration. | Choose if USB connectivity or hardware crypto acceleration is mandatory, and larger package size is acceptable. |
Compared with STM32L431CBU6, the KBU6TR offers double Flash/SRAM for complex firmware and future-proofing; versus STM32L433RCT6, it trades USB/crypto for SAI/audio and SDMMC storage - making it optimal for audio-sensor fusion and SD-card-based data logging in compact form factors.
Availability
STM32L431KBU6TR is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, portable medical diagnostics, smart wearables, and energy-harvesting metering systems requiring stable component supply and long-term lifecycle assurance.
Supply support for STM32L431KBU6TR 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 ICs, sensors, and automotive semiconductors since 1987.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-microwatt, with emphasis on secure firmware execution, analog integration, and seamless toolchain support via STM32CubeMX and HAL libraries.
FAQ
What is the maximum operating frequency and associated performance metric?
The STM32L431KBU6TR operates at up to 80 MHz, delivering 100 DMIPS (Dhrystone 2.1) and 273.55 CoreMark® (3.42 CoreMark/MHz). This performance is sustained with zero-wait-state execution from Flash thanks to the ART Accelerator™, enabling deterministic real-time response in motor control and sensor fusion applications without external RAM or cache.
Does this MCU support hardware encryption or secure boot features?
The STM32L431KBU6TR includes a true random number generator (RNG) and CRC calculation unit, but lacks dedicated AES or PKA accelerators found in the L4+ series. Secure boot is implemented via readout protection (RDP) levels and option byte configuration, allowing firmware authentication through external secure elements or software-based signature verification leveraging the RNG and CRC.
Can the internal opamp be used in standalone mode without external components?
Yes - the integrated operational amplifier supports non-inverting, inverting, and follower configurations with internal programmable gain (1x–40x via PGA), and can drive loads down to 50 pF. It operates from 1.71–3.6 V and draws only 65 µA typical, enabling direct sensor signal conditioning (e.g., thermopile or strain gauge amplification) without external opamps or resistors.
What debug interfaces are supported, and is JTAG available in the UFQFPN32 package?
The device supports Serial Wire Debug (SWD) and JTAG via pins PA13 (SWDIO), PA14 (SWCLK), and PA15 (JTDI). All debug signals are routed to accessible pins in the UFQFPN32 package; JTAG requires four pins (JTDI, JTDO, JTCK, JTMS), and SWD uses only two - making SWD the preferred interface for space-constrained layouts due to minimal pin count and full debug functionality.
STM32L431KBU6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM32L4
- Packaging:
- Tape & Reel (TR)
- 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:
- 26
- 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:
STM32L431KBU6TR FAQ
1.How can I place an order for STM32L431KBU6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L431KBU6TR 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 STM32L431KBU6TR reliable?
The price and inventory of STM32L431KBU6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L431KBU6TR is usually 5 days.
3.What payment methods are accepted for STM32L431KBU6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L431KBU6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L431KBU6TR?
STM32L431KBU6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L431KBU6TR 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 STM32L431KBU6TR?
For technical support, including STM32L431KBU6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L431KBU6TR requirements.
6.How does Aetrix verify that STM32L431KBU6TR is sourced from the original manufacturer or authorized distributors?
All STM32L431KBU6TR 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 STM32L431KBU6TR meets industry standards.
7.What is the process for return or replacement of STM32L431KBU6TR?
All STM32L431KBU6TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L431KBU6TR, 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 STM32L431KBU6TR part is unused and in its original packaging.
Return procedure for STM32L431KBU6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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