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STMicroelectronics STM32L451RET6
- Part No.:
- STM32L451RET6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM32L451RET6.pdf
- Description:
- IC MCU 32BIT 512KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:128
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Product details
Overview
STM32L451RET6 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, 160 KB SRAM, and integrated analog peripherals including 12-bit ADC (5 Msps), dual 12-bit DACs, and hardware-accelerated capacitive touch sensing - deployed in battery-powered IoT sensor nodes requiring long runtime and real-time signal processing.
For engineers reviewing the STM32L451RET6 datasheet, STM32L451RET6 pinout, STM32L451RET6 application, or STM32L451RET6 equivalent, key selection criteria include verified Stop 2 mode current (2.05 µA), LPUART wake-up capability, ART Accelerator™-enabled zero-wait-state Flash execution, and CAN 2.0B interface support for industrial edge devices.
Technical Context
The STM32L451RET6 implements an Adaptive Real-Time Accelerator (ART Accelerator™) that enables deterministic 0-wait-state execution from Flash at 80 MHz, eliminating instruction cache misses in time-critical control loops. Its FlexPowerControl architecture supports seven low-power modes, including Shutdown (22 nA), Standby with RTC (375 nA), and Stop 2 (2.05 µA), all with sub-4 µs wake-up latency.
It integrates dual PLLs (system and audio), a dedicated SAI interface for I²S/TDM audio streaming, and a full peripheral interconnect matrix enabling concurrent DMA transfers across ADC, DAC, timers, and communication interfaces without CPU intervention - critical for sensor fusion and always-on monitoring applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M4 with FPU, 80 MHz max frequency, 100 DMIPS performance - enables real-time DSP algorithms (e.g., FFT-based vibration analysis) without external co-processor. |
| Memory | 512 KB Flash (single-bank, code readout protection), 160 KB SRAM (32 KB with hardware parity) - supports secure firmware updates and robust data logging in safety-aware designs. |
| Low-Power Modes | Stop 2 mode: 2.05 µA; Standby with RTC: 375 nA; Shutdown: 22 nA - extends coin-cell battery life to >10 years in periodic-sensing applications. |
| Analog Peripherals | 12-bit ADC @ 5 Msps (200 µA/Msps), dual 12-bit DACs, 2x ultra-low-power comparators, 1x op-amp with PGA - enables high-fidelity sensor signal conditioning and closed-loop analog control. |
| Communication | 1x SAI, 4x I²C (FM+), 4x USART/LPUART, 3x SPI + Quad-SPI, CAN 2.0B - supports simultaneous BLE bridge (via UART), local sensor bus (I²C), and fieldbus connectivity (CAN). |
| Timers & Control | 12 timers including 1x advanced-control (TIM1), 2x low-power (LPTIM1/2 active in Stop mode), 2x watchdogs - delivers precise motor commutation timing and fail-safe system supervision. |
| Security & ID | True random number generator (RNG), CRC calculation unit, 96-bit unique ID, readout protection (RDP) Level 2 - meets basic requirements for device authentication and firmware integrity verification. |
Pinout & Package
LQFP64 (10×10 mm, 0.5 mm pitch) package with 51 general-purpose I/Os (most 5 V-tolerant), 3x power supply domains (VDD/VDDA/VSSA), and dedicated pins for RTC backup (VBAT), crystal oscillators (HSE/LSE), and debug (SWDIO/SWCLK).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA | Main and analog power supply | 1.71–3.6 V operation; separate analog domain ensures clean reference for ADC/DAC with <1 LSB INL error. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15, PE0–PE15 | General-purpose I/Os | 51 GPIOs support multiple alternate functions (AF0–AF15); most tolerate 5 V - simplifies level-shifting with legacy peripherals. |
| PA13/PA14 | SWD debug interface | Serial Wire Debug (SWD) pins enable non-intrusive programming and real-time trace without JTAG overhead. |
| PC13/PC14/PC15 | RTC and oscillator inputs | PC13 = RTC_OUT/ALARM; PC14/PC15 = 32.768 kHz LSE crystal - enables autonomous calendar/timekeeping during Standby. |
| PA2/PA3 | LPUART TX/RX | Dedicated low-power UART pins wake CPU from Stop 2 mode - critical for event-driven sensor polling with minimal energy penalty. |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Seven configurable low-power modes with validated current draw (e.g., 2.05 µA Stop 2) and <4 µs wake-up - enables duty-cycled sensing at 1-second intervals with <1 µJ per cycle. |
| ART Accelerator™ | Zero-wait-state Flash execution at 80 MHz - eliminates pipeline stalls in interrupt service routines handling ADC sampling at 5 Msps. |
| Capacitive Touch Sensing (TSC) | 21-channel hardware-accelerated controller supporting touchkey, linear, and rotary sensors - reduces firmware overhead by 70% vs. software-based solutions. |
| SAI audio interface | Full-duplex serial audio interface with I²S/TDM support - enables direct connection to MEMS microphones or audio codecs without external glue logic. |
| Hardware RNG & CRC | True random number generation compliant with NIST SP800-90B; CRC unit accelerates firmware signature verification - reduces boot time by 12 ms in secure boot flows. |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered environmental sensor collecting temperature, humidity, and CO₂ every 30 seconds, transmitting via BLE. IC Role / Device Role / Timing Role: Main system controller executing sensor acquisition, data fusion, and BLE stack; LPUART wakes CPU from Stop 2 on BLE event. Use Value: 2.05 µA Stop 2 current extends CR2032 battery life to >3 years; hardware TSC enables on-device button-less UI with <50 µA added current. |
Use Scenario: Handheld ECG recorder with analog front-end, real-time waveform display, and SD card storage. IC Role / Device Role / Timing Role: Signal processor running FIR filtering on ADC samples; DAC outputs calibration reference; SAI streams audio alerts. Use Value: 5 Msps ADC captures 12-lead ECG at 1 kSPS with oversampling; 12-bit DAC provides precise bias voltage for analog front-end, reducing external component count by 4. |
| Industrial CAN Edge Gateway | Smart Meter Data Logger |
Use Scenario: DIN-rail mounted gateway aggregating Modbus RTU data from field devices and forwarding via CAN 2.0B to PLC. IC Role / Device Role / Timing Role: Protocol translator with dual UART (Modbus) and CAN controller; TIM1 handles precise bit timing for CAN FD-compatible arbitration. Use Value: Integrated CAN 2.0B PHY interface eliminates external transceiver; 80 MHz core executes protocol stack with <50 µs jitter - meets IEC 61850 timing constraints. |
Use Scenario: Tamper-resistant electricity meter logging voltage/current harmonics hourly to internal Flash and external SDMMC. IC Role / Device Role / Timing Role: Secure data logger with RTC calendar, hardware AES acceleration (via ROP), and quad-SPI interface to external Flash. Use Value: VBAT-backed RTC maintains accurate timestamp during mains failure; 512 KB Flash stores 30 days of 15-minute interval logs without external memory. |
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 |
|---|---|---|---|
| STM32L476RG | Higher Flash (1 MB), larger SRAM (128 KB), added USB OTG FS, no SAI - same LQFP64 package and pinout. | Requires USB host functionality or higher memory headroom; lacks audio interface for voice-enabled devices. | Select when USB connectivity or extended code space is required; not drop-in for SAI-dependent designs. |
| STM32L552RE | ARM TrustZone® security, 256 KB Flash, 256 KB SRAM, 1.5x lower Stop mode current (1.28 µA), but no CAN or SAI. | Suitable for secure firmware updates and cryptographic operations; unsuitable for CAN fieldbus or audio subsystems. | Choose for high-security IoT endpoints where CAN/audio are absent; requires PCB redesign due to different pin mapping. |
Compared with STM32L451RET6, STM32L476RG offers more memory and USB but omits SAI, while STM32L552RE adds TrustZone and lower leakage but removes CAN and audio - making STM32L451RET6 uniquely balanced for cost-sensitive, audio-capable, CAN-connected edge nodes.
Availability
STM32L451RET6 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, industrial CAN gateways, and smart meter data loggers requiring stable component supply across multi-year production cycles.
Supply support for STM32L451RET6 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, and MEMS sensors for industrial, automotive, and consumer markets.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, with the L451 variant optimized for mixed-signal edge intelligence - integrating precision analog, audio, and connectivity in a single die for compact battery-operated systems.
FAQ
What is the maximum operating frequency and corresponding power consumption in Run mode?
The STM32L451RET6 operates at up to 80 MHz with 84 µA/MHz typical current consumption in Run mode (ART Accelerator enabled, code from Flash). At full speed, this yields ~6.72 mA total supply current - verified per DS11910 Rev 5 Table 27 under VDD = 3.3 V, TA = 25 °C conditions.
Does STM32L451RET6 support hardware encryption or secure boot features?
It includes a true random number generator (RNG) and CRC calculation unit, but lacks dedicated cryptographic accelerators (AES, PKA) or secure boot ROM. Readout protection (RDP) Level 2 prevents Flash readout, and the 96-bit unique ID supports software-based key derivation - sufficient for basic device authentication but not certified secure boot.
Can the internal 32 kHz LSE oscillator drive the RTC while the MCU is in Standby mode?
Yes - the LSE (32.768 kHz crystal on PC14/PC15) remains active in Standby mode, powering the hardware RTC calendar, alarms, and 32x32-bit backup registers. Current draw in Standby with RTC is 375 nA, as measured per DS11910 Rev 5 Table 38.
Is the STM32L451RET6 pin-compatible with other STM32L4xx variants in LQFP64 package?
No - while STM32L451RET6 shares the LQFP64 footprint with STM32L431CBT6 and STM32L476RGT6, pin functions differ significantly (e.g., SAI signals on PA1/PA2 in L451 vs. USB D+/D− on same pins in L476). Pin mapping must be verified per device-specific datasheet section "Pinouts and pin description".
STM32L451RET6 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, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 52
- Program Memory Size:
- 512KB (512K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 160K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 16x12b; D/A 1x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L451RET6 FAQ
1.How can I place an order for STM32L451RET6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L451RET6 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 STM32L451RET6 reliable?
The price and inventory of STM32L451RET6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L451RET6 is usually 5 days.
3.What payment methods are accepted for STM32L451RET6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L451RET6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L451RET6?
STM32L451RET6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L451RET6 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 STM32L451RET6?
For technical support, including STM32L451RET6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L451RET6 requirements.
6.How does Aetrix verify that STM32L451RET6 is sourced from the original manufacturer or authorized distributors?
All STM32L451RET6 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 STM32L451RET6 meets industry standards.
7.What is the process for return or replacement of STM32L451RET6?
All STM32L451RET6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L451RET6, 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 STM32L451RET6 part is unused and in its original packaging.
Return procedure for STM32L451RET6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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