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STMicroelectronics STM32L451RET6TR
- Part No.:
- STM32L451RET6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM32L451RET6TR.pdf
- Description:
- IC MCU 32BIT 512KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:6,529
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Product details
Overview
STM32L451RET6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, delivering 100 DMIPS at 80 MHz, featuring 512 KB Flash, 160 KB SRAM, and integrated analog peripherals including 12-bit ADC (5 Msps), dual 12-bit DAC, op-amp with PGA, and RTC with hardware calendar-designed for battery-powered IoT sensor nodes requiring long runtime and audio-capable edge processing.
For engineers reviewing the STM32L451RET6TR datasheet, STM32L451RET6TR pinout, STM32L451RET6TR application, or STM32L451RET6TR equivalent, key selection criteria include verified low-power mode current (375 nA Standby + RTC), LQFP64 package compatibility, SAI/USART/LPUART interface availability, and FlexPowerControl architecture enabling sub-µA wake-up latency in Stop 2 mode.
Technical Context
The STM32L451RET6TR 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) and interconnect matrix for deterministic peripheral arbitration. Its power architecture integrates dual voltage regulators supporting dynamic voltage scaling across Run, Stop, and Standby modes.
Clock management includes two PLLs (system and audio), auto-trimmed MSI oscillator (±0.25%), and dedicated clock recovery for USB-free SAI audio synchronization. Analog subsystem features independent supply domains, hardware oversampling (up to 16-bit), and buffered 2.048 V reference for precision sensor signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU, 80 MHz max frequency, 100 DMIPS performance |
| Memory | 512 KB Flash (single-bank, code readout protected), 160 KB SRAM (32 KB with parity) |
| Low-Power Modes | 375 nA Standby + RTC; 2.05 µA Stop 2 mode; 4 µs wakeup from Stop |
| Analog Peripherals | 1× 12-bit ADC (5 Msps, 16-bit oversampling), 2× 12-bit DAC, 1× op-amp with PGA, 2× comparators |
| Communication | 1× SAI, 4× I²C (FM+), 4× USART/LPUART, 3× SPI + Quad-SPI, CAN 2.0B, SDMMC |
| Package | LQFP64 (10 × 10 mm, 0.5 mm pitch), ECOPACK2® compliant |
| Operating Range | 1.71–3.6 V supply; –40 °C to +85 °C ambient temperature |
Pinout & Package
LQFP64 package with 64-pin quad flat lead frame, 0.5 mm pitch, exposed thermal pad, RoHS-compliant and ECOPACK2® certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power supply and ground | Core and I/O domain supply (1.71–3.6 V); decoupling required per datasheet layout guidelines |
| VREF+, VREF– | Analog reference inputs | Enable precise ADC/DAC operation; support external reference or internal 2.048 V buffered source |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15 | General-purpose I/Os | Up to 83 fast I/Os (most 5 V-tolerant); configurable as GPIO, AF, or analog; support capacitive touch sensing |
| PA9/PA10, PB6/PB7, etc. | Alternate function pins | Map to USART1/2/3, I²C1/2/3, SPI1/2/3, SAI, CAN, LPUART, and USB OTG FS (no USB PHY on L451) |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external reset button or supervisor IC integration |
| BOOT0 | Boot mode selection | High at power-up enables system memory boot (for DFU); low selects main Flash memory |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables granular power gating per peripheral domain, reducing active-mode current to 84 µA/MHz |
| Batch Acquisition Mode (BAM) | Allows CPU to sleep while DMA transfers sensor data to SRAM, minimizing wake cycles in data-logging applications |
| SAI audio interface | Supports I²S, PCM, and SPDIF protocols with master/slave configuration-enables direct connection to MEMS microphones or audio codecs without external DSP |
| Capacitive touch sensing controller (TSC) | Provides 21-channel hardware-accelerated touchkey/linear/rotary sensing with noise immunity up to ±5 kV ESD |
| True random number generator (RNG) | Fulfills NIST SP800-90B entropy requirements for secure key generation in TLS/DTLS stack implementations |
Applications
| Smart Wearable Sensor Hub | Industrial Wireless Node |
|---|---|
Use Scenario: Compact wrist-worn device aggregating accelerometer, temperature, and heart-rate data with local FFT preprocessing before BLE transmission. IC Role / Device Role / Timing Role: Primary application processor executing RTOS, managing sensor fusion algorithms, and synchronizing multi-channel ADC sampling via hardware triggers. Use Value: 2.05 µA Stop 2 mode extends coin-cell life beyond 12 months; SAI interface enables direct I²S microphone input without external audio codec. | Use Scenario: Battery-powered vibration monitor mounted on rotating machinery, transmitting predictive maintenance alerts via LoRaWAN gateway. IC Role / Device Role / Timing Role: Low-power host MCU controlling MEMS accelerometer, performing real-time RMS calculation, and waking radio only on threshold breach. Use Value: 375 nA Standby + RTC allows precise 1-hour sampling intervals; LPUART supports wake-on-frame for asynchronous command reception. |
| Portable Medical Pulse Oximeter | Audio-Enabled Smart Home Controller |
Use Scenario: Handheld SpO₂ monitor using red/IR LED drivers and photodiode front-end with real-time saturation calculation. IC Role / Device Role / Timing Role: Analog signal conditioner and digital controller-driving LEDs via PWM, digitizing photodiode output via synchronized ADC, and computing SpO₂ via proprietary algorithm. Use Value: Integrated op-amp with PGA eliminates external instrumentation amplifier; 12-bit DAC drives LED current with <1% linearity error. | Use Scenario: Voice-controlled thermostat integrating far-field microphone array, local wake-word detection, and Zigbee/Thread radio control. IC Role / Device Role / Timing Role: Audio preprocessor running neural network inference on microphone data; interfaces to external Wi-Fi/BLE SoC via UART and manages local UI via capacitive touch. Use Value: SAI supports 4-mic I²S TDM stream; TSC enables seamless touch slider for temperature adjustment without mechanical buttons. |
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 | Smaller footprint (UFQFPN32), 256 KB Flash, no SAI, no Quad-SPI, 1x DAC only | Suitable for cost-sensitive, space-constrained sensor endpoints without audio or high-speed memory expansion | Select when audio interface and >256 KB Flash are unnecessary and BOM cost reduction is critical |
| STM32L552RET6P | ARM TrustZone®, 512 KB Flash, 256 KB SRAM, enhanced crypto accelerators, 110 nA Stop mode | Required for firmware integrity verification, secure boot, and encrypted OTA updates in regulated medical/industrial deployments | Select when hardware-based security isolation and PSA Certified Level 2 compliance are mandatory |
Compared with STM32L432KCU6, the STM32L451RET6TR adds SAI and Quad-SPI for audio and external memory-critical for edge AI inference; versus STM32L552RET6P, it trades TrustZone for lower cost and simpler certification path while retaining identical low-power performance and analog feature set.
Availability
STM32L451RET6TR is available at Aetrix Electronics and suitable for smart wearables, industrial wireless sensors, portable medical devices, and audio-enabled smart home controllers requiring stable component supply across multi-year production cycles.
Supply support for STM32L451RET6TR 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-grade components since 1987.
The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and real-time responsiveness-optimized for IoT edge nodes, portable healthcare, and energy-efficient industrial controls.
FAQ
What is the maximum operating frequency and core type of the STM32L451RET6TR?
The STM32L451RET6TR features an Arm Cortex-M4 core with FPU, operating at up to 80 MHz. It delivers 100 DMIPS performance and supports DSP instructions. The ART Accelerator™ enables zero-wait-state execution from Flash memory, ensuring deterministic timing for real-time tasks without external cache.
Does the STM32L451RET6TR support USB connectivity?
No, the STM32L451RET6TR does not integrate a USB physical layer (PHY) or USB controller. It lacks USB OTG or device functionality. For USB-enabled designs, ST recommends the STM32L476RG or STM32L4A6RG variants, which include full-speed USB 2.0 OTG FS with embedded PHY and crystal-less capability.
What low-power modes are available and what are their typical current draws?
The device offers Shutdown (22 nA), Standby (106 nA), Standby + RTC (375 nA), Stop 2 (2.05 µA), and Run mode (84 µA/MHz). All modes support multiple wakeup sources including I/O pins, RTC alarms, and communication interfaces like LPUART. Current values are measured at 3.3 V and 25 °C per DS11910 Rev 5.
Is the STM32L451RET6TR pin-compatible with other STM32L4xx devices in LQFP64 package?
Yes, it shares identical pinout with STM32L431RC, STM32L432KC, and STM32L433RC in LQFP64. However, peripheral mapping differs: SAI and Quad-SPI signals appear on unique pins not present in L431/L432, and some alternate functions (e.g., CAN, SDMMC) are disabled or relocated. Hardware design must verify AF remapping per datasheet Table 16.
STM32L451RET6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- 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, 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:
STM32L451RET6TR FAQ
1.How can I place an order for STM32L451RET6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L451RET6TR 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 STM32L451RET6TR reliable?
The price and inventory of STM32L451RET6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L451RET6TR is usually 5 days.
3.What payment methods are accepted for STM32L451RET6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L451RET6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L451RET6TR?
STM32L451RET6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L451RET6TR 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 STM32L451RET6TR?
For technical support, including STM32L451RET6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L451RET6TR requirements.
6.How does Aetrix verify that STM32L451RET6TR is sourced from the original manufacturer or authorized distributors?
All STM32L451RET6TR 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 STM32L451RET6TR meets industry standards.
7.What is the process for return or replacement of STM32L451RET6TR?
All STM32L451RET6TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L451RET6TR, 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 STM32L451RET6TR part is unused and in its original packaging.
Return procedure for STM32L451RET6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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