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STMicroelectronics STM32L471RET3
- Part No.:
- STM32L471RET3
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM32L471RET3.pdf
- Description:
- IC MCU 32BIT 512KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,475
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Product details
Overview
STM32L471RET3 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 512 KB Flash, 128 KB SRAM, and integrated analog peripherals including three 12-bit ADCs (5 Msps), two 12-bit DACs, two op-amps, and two ultra-low-power comparators. It supports advanced low-power modes (e.g., 420 nA Standby with RTC) and is deployed in battery-powered IoT sensor nodes, portable medical monitors, and energy-harvesting edge controllers.
For engineers reviewing the STM32L471RET3 datasheet, STM32L471RET3 pinout, STM32L471RET3 application, or STM32L471RET3 equivalent, key selection criteria include verified ultra-low-power operation across -40 °C to 105 °C, dual-bank Flash with read-while-write capability, hardware parity on 32 KB SRAM, LQFP64 package compatibility, and CAN 2.0B interface support for industrial fieldbus integration.
Technical Context
The device implements an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from Flash at 80 MHz, paired with a Memory Protection Unit (MPU) for secure task isolation. Its FlexPowerControl architecture integrates five distinct low-power modes-Shutdown (30 nA), Standby (120 nA), Stop 2 (1.1 µA), and Run (100 µA/MHz)-with sub-microsecond wakeup (4 µs from Stop).
Clock management includes three PLLs (system, audio, ADC), four clock sources (HSE 4–48 MHz, LSE 32.768 kHz, HSI16 ±1%, MSI auto-trimmed to ±0.25%), and dedicated low-power timers (LPTIM1/LPTIM2) functional in Stop mode. The interconnect matrix enables concurrent peripheral access without bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU, 80 MHz max, 100 DMIPS - enables real-time DSP and control algorithms without external coprocessor |
| Memory | 512 KB Flash (2 banks, RWW), 128 KB SRAM (32 KB with hardware parity) - supports firmware updates over-the-air and safety-critical data integrity |
| Low-Power Performance | 420 nA Standby with RTC, 1.1 µA Stop 2 mode - extends coin-cell battery life to >10 years in periodic-sensing applications |
| Analog Peripherals | 3× 12-bit ADC (5 Msps, 16-bit oversampling), 2× 12-bit DAC, 2× op-amps, 2× comparators - enables closed-loop analog signal conditioning and sensor excitation |
| Communication | CAN 2.0B, 5× USART, LPUART, 2× SAI, 3× I²C, 3× SPI, QuadSPI, SDMMC - supports mixed wired/wireless edge node connectivity and audio streaming |
| Package & Temp | LQFP64 (10 × 10 mm), -40 °C to +105 °C industrial grade - compatible with standard PCB assembly and high-reliability industrial environments |
Pinout & Package
LQFP64 package: 64-pin quad flat pack with 0.5 mm pitch, exposed thermal pad, RoHS-compliant ECOPACK2® construction. Pin count and layout optimized for compact industrial control and portable instrumentation designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power supply and ground | 1.71–3.6 V operation; decoupling required per datasheet Section 6.3.6 for stable low-power mode transitions |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15, PE0–PE15 | General-purpose I/Os | Up to 51 fast I/Os (most 5 V-tolerant); 14 support independent 1.08–3.6 V supply for mixed-voltage interfacing |
| NRST | Active-low reset input | Internal pull-up; accepts external reset pulse ≥20 ns wide; triggers system reset and BOR circuitry |
| BOOT0 | Boot mode selection | High at reset enables system memory bootloader; controlled via external pull-down for normal Flash execution |
| SWDIO / SWCLK | Serial Wire Debug interface | 2-pin debug port supporting full SWD protocol; no JTAG pins required - reduces PCB footprint and routing complexity |
| VBAT | Backup power supply | Connects to coin cell or supercapacitor; powers RTC and 32×32-bit backup registers in Shutdown (300 nA) |
Key Features
| Feature | Design Value |
|---|---|
| ART Accelerator™ | Zero-wait-state Flash execution at 80 MHz - eliminates CPU stalls during code fetch, improving deterministic real-time response |
| Batch Acquisition Mode (BAM) | Peripheral-triggered autonomous data capture without CPU wake-up - reduces active time in sensor polling loops by >90% |
| Dual-bank Flash with RWW | Execute from Bank 1 while programming Bank 2 - enables seamless firmware updates without service interruption |
| Hardware CRC unit & 96-bit UID | Dedicated CRC32 engine + factory-programmed unique ID - accelerates secure boot verification and device identity binding |
| True Random Number Generator (RNG) | FIPS-compliant entropy source - provides cryptographically secure keys for TLS handshake and secure element provisioning |
Applications
| Wireless Sensor Node | Portable ECG Monitor |
|---|---|
Use Scenario: Battery-powered environmental sensor collecting temperature, humidity, and CO₂ every 5 minutes, transmitting via LoRaWAN. IC Role / Device Role / Timing Role: Main controller managing sensor acquisition, signal processing (FIR filtering), low-power scheduling, and radio interface timing synchronization. Use Value: 420 nA Standby with RTC ensures >12-year battery life on CR2032; LPUART enables immediate wake-on-receive for command-response protocols. | Use Scenario: Handheld electrocardiogram device acquiring 3-lead analog signals, performing real-time QRS detection, and storing waveform data locally. IC Role / Device Role / Timing Role: Analog front-end controller handling ADC sampling (3× 12-bit @ 2 ksps), op-amp-based signal conditioning, and DMA-driven waveform buffering. Use Value: Integrated 3× ADC with hardware oversampling delivers 16-bit effective resolution; 128 KB SRAM enables 30-second waveform buffer without external memory. |
| Smart Utility Meter | Industrial PLC I/O Module |
Use Scenario: DIN-rail mounted electricity meter measuring voltage/current harmonics, computing kWh, and communicating via RS-485 and NB-IoT. IC Role / Device Role / Timing Role: System-on-chip managing metrology calculations (via DSP instructions), secure firmware updates, and dual-interface communication stack. Use Value: CAN 2.0B interface connects to local fieldbus; dual-bank Flash allows A/B firmware update with rollback - meeting IEC 62056-21 and DLMS/COSEM requirements. | Use Scenario: Modular digital input/output expansion unit for programmable logic controllers, monitoring 16 discrete sensors and driving 8 relay outputs. IC Role / Device Role / Timing Role: Deterministic I/O coordinator using advanced timers (TIM1/TIM8) for precise PWM generation and input capture with 100 ns resolution. Use Value: 2× 16-bit advanced motor-control timers provide synchronized 3-phase PWM; 51 GPIOs with 5 V tolerance simplify direct connection to industrial 24 V logic levels. |
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 |
|---|---|---|---|
| STM32L432KCU6 | 48-pin UFBGA, 256 KB Flash, no CAN, no SDMMC, single ADC | Targeted for space-constrained cost-sensitive designs without fieldbus or high-speed storage needs | Select when board area < 50 mm² and CAN/SDMMC are unnecessary; lower BOM cost but reduced peripheral headroom |
| STM32L552RET6 | ARM TrustZone®, 512 KB Flash, 256 KB SRAM, enhanced tamper protection, 1.1 µA Stop 2 | Required for applications needing PSA Level 1 certification, secure boot, and encrypted firmware storage | Choose for connected medical or payment devices where hardware root-of-trust and secure key lifecycle management are mandatory |
Compared with STM32L432KCU6, the STM32L471RET3 offers CAN, dual ADCs, and larger memory for complex edge analytics; versus STM32L552RET6, it trades security extensions for lower power in non-certified industrial use cases - making it optimal for battery-operated field instruments requiring rich analog and fieldbus integration without cryptographic overhead.
Availability
STM32L471RET3 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meters, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for STM32L471RET3 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, specializing in microcontrollers, power management, and sensing technologies for industrial, automotive, and consumer markets.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-microwatt, with design emphasis on energy harvesting, battery longevity, and integrated analog signal chains for intelligent edge devices.
FAQ
What is the maximum operating frequency and associated performance metric?
The STM32L471RET3 operates at up to 80 MHz with an ART Accelerator™, delivering 100 DMIPS (Dhrystone 2.1) and 273.55 CoreMark® (3.42 CoreMark/MHz). This performance level supports real-time control loops, FFT-based spectral analysis, and lightweight protocol stacks like MQTT-SN without external acceleration.
Does this MCU support hardware cryptographic acceleration?
No, the STM32L471RET3 does not include dedicated cryptographic accelerators (AES, PKA, HASH). It relies on software libraries (e.g., Mbed TLS) for encryption. For hardware-accelerated crypto, consider the STM32L5 series with AES-256 and PKA engines compliant with PSA Certified Level 1.
What are the supported low-power modes and their typical current draw?
Validated low-power modes include Shutdown (30 nA), Standby (120 nA), Standby with RTC (420 nA), Stop 2 (1.1 µA), and Stop 1 (1.4 µA with RTC). All values measured per DS10741 Rev 3 Section 6.3.4 at 25 °C with all clocks gated and regulators in low-power state - critical for battery-life modeling in intermittent-sensing applications.
Is the LQFP64 package pin-compatible with other STM32L4 variants?
Yes, the LQFP64 footprint (10 × 10 mm, 0.5 mm pitch) is mechanically and electrically compatible across STM32L4x1, L4x2, and L4x3 subfamilies sharing the same pin count - enabling drop-in migration between 256 KB/512 KB/1 MB Flash variants when pin functions align per datasheet Table 16.
STM32L471RET3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-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, MMC/SD, QSPI, SAI, SPI, SWPMI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 51
- Program Memory Size:
- 512KB (512K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 16x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L471RET3 FAQ
1.How can I place an order for STM32L471RET3 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L471RET3 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 STM32L471RET3 reliable?
The price and inventory of STM32L471RET3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L471RET3 is usually 5 days.
3.What payment methods are accepted for STM32L471RET3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L471RET3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L471RET3?
STM32L471RET3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L471RET3 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 STM32L471RET3?
For technical support, including STM32L471RET3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L471RET3 requirements.
6.How does Aetrix verify that STM32L471RET3 is sourced from the original manufacturer or authorized distributors?
All STM32L471RET3 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 STM32L471RET3 meets industry standards.
7.What is the process for return or replacement of STM32L471RET3?
All STM32L471RET3 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L471RET3, 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 STM32L471RET3 part is unused and in its original packaging.
Return procedure for STM32L471RET3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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