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STMicroelectronics STM32L051R8H7
- Part No.:
- STM32L051R8H7
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-TFBGA
- Datasheet:
-
STM32L051R8H7.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 64TFBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,550
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Product details
Overview
STM32L051R8H7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP64 package, featuring 64 KB Flash with ECC, 8 KB SRAM, 2 KB EEPROM, 12-bit ADC (1.14 Msps), and operation down to 1.65 V. It delivers 0.95 DMIPS/MHz performance at up to 32 MHz and supports industrial temperature range (–40 to +125 °C), making it suitable for battery-powered smart sensors and portable medical devices.
For engineers reviewing the STM32L051R8H7 datasheet, STM32L051R8H7 pinout, STM32L051R8H7 application, or STM32L051R8H7 equivalent, key selection criteria include standby current (0.27 µA), RTC + RAM retention in Stop mode (0.8 µA), 45 5V-tolerant I/Os, dual ultra-low-power comparators with wake-up capability, and integrated 32 kHz RTC oscillator with calibration.
Technical Context
The STM32L051R8H7 implements a tightly coupled Cortex-M0+ core with Memory Protection Unit (MPU), supporting dynamic voltage scaling across three power ranges (1.65–3.6 V) to optimize active and low-power mode efficiency. Its clock system integrates multiple internal oscillators (HSI16, MSI, LSI, LSE) plus PLL and external crystal support (1–25 MHz), enabling precise timing control for real-time tasks and ultra-low-power wake-up sequences.
Low-power architecture includes five operational modes-Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby-with sub-microamp current draw in Stop (0.4 µA) and Standby (0.27 µA), and hardware-accelerated peripherals including 7-channel DMA, CRC unit, and serial wire debug (SW-DP) for energy-aware firmware development.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+ with MPU, 32 MHz max, 0.95 DMIPS/MHz - enables deterministic real-time control with memory isolation for safety-critical firmware. |
| Memory | 64 KB Flash (ECC-protected), 8 KB SRAM, 2 KB EEPROM (ECC-protected) - ensures data integrity in long-life embedded deployments without external error correction. |
| Power Consumption | 0.27 µA Standby (2 wakeup pins), 0.8 µA Stop + RTC + 8 KB RAM retention - extends coin-cell battery life to >10 years in always-on sensing nodes. |
| Analog Peripherals | 12-bit ADC (1.14 Msps, 16 channels, min 1.65 V supply), 2x ultra-low-power comparators - supports high-resolution sensor acquisition and threshold-triggered wake-up in sub-µA sleep states. |
| I/O & Connectivity | 51 fast I/Os (45 5V tolerant), 2x USART (ISO 7816/IrDA), 1x LPUART, 4x SPI (16 Mbit/s), 2x I2C (SMBus/PMBus) - enables robust interfacing with legacy and low-power peripherals in constrained environments. |
| Clock Sources | HSI16 (±1%), MSI (65 kHz–4.2 MHz), LSE (32 kHz RTC w/ calibration), HSE (1–25 MHz) - provides flexible, accurate timing for timekeeping, communication, and wake-up without external crystals in many use cases. |
| Package | LQFP64 (10 × 10 mm, 0.5 mm pitch) - standard surface-mount footprint compatible with automated assembly and thermal management in industrial PCB layouts. |
Pinout & Package
LQFP64 package: 64-pin, 10 × 10 mm low-profile quad flat package with exposed thermal pad (ECOPACK2-compliant, RoHS and REACH compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDIO2 | Power supply inputs | Dual-domain supply: VDD/VDDA powers analog/digital core (1.65–3.6 V); VDDIO2 powers I/O bank 2 - enables mixed-voltage I/O interfacing and noise-isolated ADC operation. |
| VSS, VSSA, VSSIO2 | Ground returns | Separate analog/digital/IO ground planes reduce coupling noise and improve ADC accuracy and EMI resilience. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15 | General-purpose I/Os | Up to 51 GPIOs (45 5V tolerant); configurable as EXTI lines, timer channels, or peripheral alternate functions - supports flexible signal routing and hardware event triggering. |
| NRST | Active-low reset input | Asynchronous reset with programmable pull-up; accepts 1.65–3.6 V logic - ensures reliable initialization under brownout or deep-sleep recovery conditions. |
| BOOT0 | Boot mode selection | High at reset enables system memory bootloader (USART/SPI); low selects main Flash - simplifies field firmware updates without JTAG debugger. |
| SWDIO / SWCLK | Serial Wire Debug interface | 2-pin debug port supporting full SW-DP functionality - enables non-intrusive code download, breakpoint debugging, and real-time variable inspection during ultra-low-power operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power standby mode | 0.27 µA with two wakeup pins enabled - eliminates need for external supervisor IC in battery-backed applications. |
| RTC with calibration and backup registers | 32 kHz LSE-based real-time clock with ±1 ppm accuracy over temperature, plus 20-byte backup register - maintains timekeeping and state across power cycles without external components. |
| ECC-protected memories | Flash and EEPROM with on-the-fly error correction - prevents silent data corruption in mission-critical firmware storage and parameter retention. |
| Hardware CRC calculation unit | 32-bit CRC engine supporting multiple polynomials (e.g., CRC-32, CRC-16-CCITT) - accelerates firmware integrity checks and secure OTA update validation. |
| Pre-programmed system memory bootloader | Factory-loaded USART/SPI bootloader accessible via BOOT0 - enables firmware recovery and field upgrades without dedicated programming hardware. |
Applications
| Smart Utility Metering | Portable Medical Sensors |
|---|---|
Use Scenario: Battery-powered gas/water meters requiring decade-long operation with periodic RF transmission and tamper detection. IC Role / Device Role / Timing Role: Main controller managing sensor polling, metrology calculations, secure data logging, and low-duty-cycle LoRaWAN/NB-IoT transmission scheduling. Use Value: Sub-µA standby current and RTC-driven wake-up enable 15-year battery life; ECC Flash ensures firmware reliability over full product lifecycle. | Use Scenario: Wearable ECG or glucose monitors operating from CR2032 coin cell with clinical-grade signal acquisition. IC Role / Device Role / Timing Role: Signal acquisition hub digitizing analog biosignals via 12-bit ADC, performing real-time filtering, and transmitting encrypted data via BLE-compatible UART. Use Value: 1.65 V minimum supply and ultra-low-power comparators allow direct connection to low-output sensors; 8 KB SRAM supports on-device FFT processing without external memory. |
| Industrial Predictive Maintenance Node | Asset Tracking Beacon |
Use Scenario: Vibration/temperature node mounted on rotating machinery, harvesting energy or using primary lithium battery. IC Role / Device Role / Timing Role: Edge intelligence unit running anomaly detection algorithms, triggering alerts only on deviation events, and waking peripherals selectively. Use Value: Dynamic voltage scaling and Stop-mode + RTC retention (0.8 µA) minimize average current; 2 KB EEPROM stores calibration and fault history with ECC protection. | Use Scenario: GPS-denied indoor asset tracker using BLE beaconing and motion-triggered location sampling. IC Role / Device Role / Timing Role: Motion-aware coordinator using internal comparators to detect movement, then activating accelerometer and BLE radio only when needed. Use Value: Comparator wake-up capability (down to 1.65 V) enables zero-power inertial monitoring; 45 5V-tolerant I/Os simplify integration with legacy industrial sensors. |
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 |
|---|---|---|---|
| STM32L071R8H7 | Same LQFP64 package, +16 KB Flash (80 KB total), +2 KB SRAM (10 KB), added AES-128 accelerator and true RNG | Required for firmware encryption, secure boot, or larger algorithm buffers (e.g., sensor fusion) | Select when cryptographic security or extended memory headroom is mandatory; otherwise, STM32L051R8H7 offers lower cost and identical low-power profile. |
| STM32L011K4T6 | LQFP32 package, 16 KB Flash, 2 KB SRAM, no EEPROM, fewer timers/I/Os (26 I/Os) | Suitable for space-constrained, cost-sensitive designs with minimal peripheral needs (e.g., simple switch controllers) | Choose for footprint reduction and BOM simplification where memory and interface count are not limiting; lacks RTC calibration and EEPROM persistence. |
Compared with STM32L071R8H7, the STM32L051R8H7 trades cryptographic acceleration and extra memory for lower unit cost and identical ultra-low-power behavior; versus STM32L011K4T6, it delivers 4× more Flash, full EEPROM, RTC calibration, and 51 I/Os - making it optimal for feature-rich, long-life IoT endpoints.
Availability
STM32L051R8H7 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial predictive maintenance nodes, and asset tracking beacons requiring stable component supply across multi-year production cycles.
Supply support for STM32L051R8H7 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 analog products for industrial, automotive, and consumer markets.
The STM32L0 series targets ultra-low-power embedded applications, emphasizing sub-µA standby operation, integrated EEPROM, and robust analog peripherals - engineered specifically for battery-operated and energy-harvesting systems demanding multi-year autonomy.
FAQ
What is the minimum operating voltage for STM32L051R8H7?
The STM32L051R8H7 operates down to 1.65 V across all functional modes, including ADC conversion, comparator operation, and Flash access. This enables direct compatibility with single-cell Li-SOCl₂, Li-MnO₂, and alkaline batteries without external regulators, preserving system-level energy efficiency.
Does STM32L051R8H7 support hardware encryption?
No, the STM32L051R8H7 does not include hardware cryptographic accelerators (e.g., AES, DES, or SHA). It relies on software libraries for encryption tasks. For hardware-accelerated security, ST recommends the STM32L071 or STM32L082 variants, which integrate AES-128 and true random number generators.
How many I/O pins support 5V tolerance?
45 of the 51 general-purpose I/O pins on the STM32L051R8H7 are 5V tolerant, allowing direct interfacing with legacy 5V peripherals (e.g., RS-232 transceivers, industrial sensors, or discrete logic) without level-shifting circuitry - reducing BOM cost and board area in mixed-voltage systems.
Is the internal RTC battery-backed?
No, the STM32L051R8H7 RTC is not battery-backed; it retains time and calendar data only during Stop mode with VDD applied and 8 KB SRAM retention enabled (0.8 µA). For true battery-backed RTC, external VBAT supply or companion PMIC with backup rail is required - the chip provides VBAT pin but no internal battery charger or switchover circuitry.
STM32L051R8H7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-TFBGA
- Series:
- STM32L0
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M0+
- Core Size:
- 32-Bit Single-Core
- Speed:
- 32MHz
- Connectivity:
- I2C, IrDA, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
- Number of I/O:
- 51
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 8K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.65V ~ 3.6V
- Data Converters:
- A/D 16x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L051R8H7 FAQ
1.How can I place an order for STM32L051R8H7 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L051R8H7 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 STM32L051R8H7 reliable?
The price and inventory of STM32L051R8H7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L051R8H7 is usually 5 days.
3.What payment methods are accepted for STM32L051R8H7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L051R8H7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L051R8H7?
STM32L051R8H7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L051R8H7 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 STM32L051R8H7?
For technical support, including STM32L051R8H7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L051R8H7 requirements.
6.How does Aetrix verify that STM32L051R8H7 is sourced from the original manufacturer or authorized distributors?
All STM32L051R8H7 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 STM32L051R8H7 meets industry standards.
7.What is the process for return or replacement of STM32L051R8H7?
All STM32L051R8H7 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L051R8H7, 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 STM32L051R8H7 part is unused and in its original packaging.
Return procedure for STM32L051R8H7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM32L051R8H7 Tags
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