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STMicroelectronics STM32L431CBT3
- Part No.:
- STM32L431CBT3
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM32L431CBT3.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,474
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Product details
Overview
STM32L431CBT3 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 128 KB Flash, 64 KB SRAM, and integrated analog peripherals including a 12-bit 5 Msps ADC, dual 12-bit DACs, and an operational amplifier with PGA. It supports 5 V-tolerant I/Os and delivers 84 µA/MHz in run mode, targeting battery-powered IoT sensors and portable medical devices.
For engineers reviewing the STM32L431CBT3 datasheet, STM32L431CBT3 pinout, STM32L431CBT3 application, or STM32L431CBT3 equivalent, key selection criteria include its FlexPowerControl low-power modes (28 nA Standby, 1.0 µA Stop 2), ART Accelerator™ for zero-wait-state Flash execution, and rich mixed-signal integration (SAI, LPUART, CAN 2.0B, touch sensing) for compact embedded control systems.
Technical Context
The STM32L431CBT3 integrates an Arm Cortex-M4 core with FPU and Adaptive Real-Time Accelerator (ART) enabling deterministic 0-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)-managed by a dedicated power control block with BOR and voltage scaling.
Analog subsystems operate on independent supplies: one 12-bit ADC (5 Msps, hardware oversampling to 16-bit), two 12-bit DACs with sample-and-hold, one rail-to-rail op-amp with programmable gain, and two ultra-low-power comparators. Digital interfaces include SAI, 4x USART, LPUART, 3x SPI, CAN 2.0B, SDMMC, and SWPMI-all accessible in low-power states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU, 80 MHz max frequency, 100 DMIPS performance |
| Memory | 128 KB Flash (single bank, code readout protection), 64 KB SRAM (16 KB with parity) |
| Power Consumption | 1.0 µA in Stop 2 mode; 28 nA in Standby mode with RTC active |
| Analog Peripherals | 1× 12-bit 5 Msps ADC (oversampling to 16-bit), 2× 12-bit DACs, 1× op-amp with PGA, 2× comparators |
| Digital Interfaces | 1× SAI, 4× USART (incl. LIN/IR/ISO7816), 1× LPUART, 3× SPI, CAN 2.0B, SDMMC, SWPMI, IRTIM |
| I/O & Packaging | 48-pin LQFP package; up to 42 fast I/Os, most 5 V-tolerant |
| Clock System | Dual PLLs, HSE (4–48 MHz), LSE (32.768 kHz), HSI16 (±1%), MSI (100 kHz–48 MHz auto-trimmed) |
Pinout & Package
STM32L431CBT3 is housed in a 48-pin LQFP (7×7 mm) package compliant with ECOPACK2® environmental standards. The package supports industrial temperature range (–40 °C to +85 °C) and features exposed thermal pad for enhanced thermal dissipation in space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power supply and ground | 1.71–3.6 V operation; decoupling required per datasheet layout guidelines |
| VREF+, VREF– | ADC reference input | Enables precise 12-bit conversion; supports external reference or internal VREFINT |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15 | General-purpose I/Os | Up to 42 pins configurable as GPIO, AF, or analog; most tolerate 5 V inputs |
| PA2/PA3 | USART2_TX/USART2_RX | Full-duplex asynchronous communication; supports LIN, IrDA, modem protocols |
| PA4/PA5 | SPI1_NSS/SPI1_SCK | Master/slave SPI interface with DMA support; compatible with Quad-SPI memory expansion |
| PA9/PA10 | USART1_TX/USART1_RX | Primary debug and host interface; supports SWD/JTAG via dedicated pins |
| NRST | Active-low reset input | External reset trigger; internal pull-up; compatible with push-button or supervisor ICs |
| VBAT | Battery backup supply | Powers RTC and 32×32-bit backup registers in shutdown (200 nA typical) |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables 8 nA Shutdown and 28 nA Standby with 5 wakeup pins-critical for multi-year battery life in remote sensors |
| ART Accelerator™ | Eliminates Flash wait states at 80 MHz, reducing code latency and dynamic power vs. cacheless M4 cores |
| Integrated analog front-end | Single-chip solution for sensor signal chain: ADC + DAC + op-amp + comparators-reduces BOM and PCB area |
| Low-power communication suite | LPUART wake-up from Stop 2, CAN 2.0B with sleep mode retention, SAI for audio-enables always-on edge processing |
| Capacitive touch sensing | 21-channel TSC supporting touchkey, linear, and rotary sensors without external ICs or firmware overhead |
Applications
| Wearable Health Monitor | Smart Utility Meter |
|---|---|
Use Scenario: Continuous ECG/PPG acquisition with real-time filtering and BLE transmission during periodic wake-ups. IC Role / Device Role / Timing Role: Central controller managing analog front-end, low-power timers, and LPUART/BLE interface; RTC provides accurate time-stamping. Use Value: 1.0 µA Stop 2 mode extends coin-cell life beyond 3 years; integrated op-amp and ADC eliminate discrete signal conditioning. | Use Scenario: Tamper-resistant electricity meter with pulse counting, LCD display, and NB-IoT backhaul using deep-sleep cycles. IC Role / Device Role / Timing Role: Main MCU executing metrology algorithms, driving LCD via SAI, and managing secure firmware updates over LPUART. Use Value: 28 nA Standby with RTC ensures calendar accuracy during grid outages; CAN 2.0B enables local HAN communication. |
| Industrial Wireless Sensor Node | Portable Diagnostic Device |
Use Scenario: Battery-powered vibration/temperature node transmitting data via LoRaWAN gateway using scheduled wake-ups. IC Role / Device Role / Timing Role: Sensor aggregator with timer-triggered ADC sampling, CRC-protected data packaging, and SPI-driven LoRa transceiver. Use Value: 84 µA/MHz efficiency minimizes energy per inference; 5 V-tolerant I/Os simplify connection to legacy industrial sensors. | Use Scenario: Handheld ultrasound probe requiring real-time beamforming, analog front-end control, and USB-C charging/power management. IC Role / Device Role / Timing Role: Real-time DSP engine executing FIR filters and envelope detection; SAI routes audio data to external codec. Use Value: FPU and 100 DMIPS enable floating-point beamforming at 80 MHz; dual DACs drive analog front-end biasing circuits. |
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 |
|---|---|---|---|
| STM32L431RCT6 | 256 KB Flash, 64 KB SRAM, LQFP64 package (64 pins) | Higher peripheral count (e.g., extra USART, SPI), larger PCB footprint | Select when >128 KB Flash or additional I/Os are required; same core/peripherals but different pinout and memory map |
| STM32L411RET6 | No FPU, no SAI, no CAN, lower max clock (80 MHz but no ART at full speed), 512 KB Flash option | Lower cost for non-DSP, non-audio applications; lacks op-amp and touch sensing | Choose for basic sensor nodes where FPU, analog integration, or audio are unnecessary-reduces BOM cost by ~15% |
Compared with STM32L431RCT6, the CBT3 offers identical performance and peripherals in a smaller 48-pin LQFP, trading Flash capacity for board space savings; versus STM32L411RET6, it adds FPU, SAI, CAN, op-amp, and touch sensing-justifying premium for mixed-signal edge AI use cases.
Availability
STM32L431CBT3 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic devices requiring stable component supply across long-lifecycle deployments.
Supply support for STM32L431CBT3 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, MEMS, and automotive semiconductors since 1987.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, combining Cortex-M4+DSP capabilities with advanced analog integration and flexible power management for battery-operated edge devices.
FAQ
What is the maximum operating temperature range for STM32L431CBT3?
The STM32L431CBT3 is rated for industrial temperature range: –40 °C to +85 °C. This is confirmed in Section 6.3.1 of DS11453 Rev 3, and applies to all LQFP48 variants including the CB suffix. No extended (105 °C) or automotive (125 °C) grade is offered in this specific part number.
Does STM32L431CBT3 support hardware encryption or secure boot?
No. STM32L431CBT3 does not integrate AES, PKA, or secure boot engines. It supports readout protection (RDP) Level 1 and 2, firewall for memory isolation, and tamper detection-but lacks dedicated cryptographic accelerators. For secure boot, external secure elements or software-based solutions are required.
Can the internal op-amp be used in unity-gain buffer configuration?
Yes. The integrated rail-to-rail op-amp supports unity-gain buffer mode with programmable gain (1x, 2x, 4x, 8x, 16x) and can drive capacitive loads up to 100 pF. Electrical characteristics in Section 6.3.22 confirm stability and bandwidth (1.5 MHz GBW) under these conditions when configured per AN4914 guidelines.
Is the STM32L431CBT3 pin-compatible with other STM32L431xx variants in LQFP48?
Yes. All STM32L431xx parts in LQFP48 (e.g., CB, RB, KB) share identical pinout and mechanical footprint per Table 15 (Pin Definitions) and Section 4 of DS11453 Rev 3. Differences are limited to Flash size (128 KB vs. 256 KB) and RDP level-not pin function or assignment.
STM32L431CBT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- Series:
- STM32L4
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- ARM® Cortex®-M4F
- 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:
- 38
- 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 SAR; D/A 2x12b
- Oscillator Type:
- External, Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L431CBT3 FAQ
1.How can I place an order for STM32L431CBT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L431CBT3 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 STM32L431CBT3 reliable?
The price and inventory of STM32L431CBT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L431CBT3 is usually 5 days.
3.What payment methods are accepted for STM32L431CBT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L431CBT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L431CBT3?
STM32L431CBT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L431CBT3 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 STM32L431CBT3?
For technical support, including STM32L431CBT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L431CBT3 requirements.
6.How does Aetrix verify that STM32L431CBT3 is sourced from the original manufacturer or authorized distributors?
All STM32L431CBT3 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 STM32L431CBT3 meets industry standards.
7.What is the process for return or replacement of STM32L431CBT3?
All STM32L431CBT3 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L431CBT3, 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 STM32L431CBT3 part is unused and in its original packaging.
Return procedure for STM32L431CBT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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