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STMicroelectronics STM32L051R8T7
- Part No.:
- STM32L051R8T7
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM32L051R8T7.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,063
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Product details
Overview
STM32L051R8T7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 64 KB Flash, 8 KB SRAM, 2 KB EEPROM, 12-bit ADC (1.14 Msps), and operating voltage range of 1.65–3.6 V. It delivers 0.95 DMIPS/MHz performance at up to 32 MHz and supports 45 5V-tolerant I/Os. Used in battery-powered IoT sensors and smart metering endpoints requiring long runtime and RTC-backed data retention.
For engineers reviewing the STM32L051R8T7 datasheet, STM32L051R8T7 pinout, STM32L051R8T7 application, or STM32L051R8T7 equivalent, key selection criteria include standby current (0.27 µA), wakeup time from Flash (5 µs), ECC-protected memory, and integrated ultra-low-power comparators with wake-up capability down to 1.65 V.
Technical Context
The STM32L051R8T7 integrates a Cortex-M0+ core with Memory Protection Unit (MPU), supporting dynamic voltage scaling across three power ranges. Its clock system combines multiple internal RC oscillators (HSI16, LSI, MSI), 32 kHz LSE for RTC calibration, and external crystal support up to 25 MHz.
Low-power operation is enabled by seven distinct modes - including Stop mode with RTC + 8 KB RAM retention (0.8 µA) and Standby with two wakeup pins (0.27 µA). Analog subsystem includes dual ultra-low-power comparators, temperature sensor, and VREFINT reference, all functional down to 1.65 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+, 32-bit, with MPU and 0.95 DMIPS/MHz efficiency |
| Max Clock | 32 MHz - enables real-time control loops and high-speed peripheral handling |
| Flash / SRAM / EEPROM | 64 KB Flash with ECC, 8 KB SRAM, 2 KB EEPROM with ECC - ensures data integrity in field-deployed devices |
| ADC | 12-bit, 1.14 Msps, up to 16 channels - supports precision sensor acquisition at low power |
| Low-Power Modes | Standby: 0.27 µA (2 wakeup pins); Stop + RTC + RAM: 0.8 µA - extends coin-cell or energy-harvesting battery life to years |
| I/O Count & Tolerance | 45 GPIOs, 5V tolerant - simplifies interface with legacy or mixed-voltage peripherals without level shifters |
| Wakeup Time | 3.5 µs from RAM, 5 µs from Flash - meets sub-10 µs latency requirements for responsive event-driven firmware |
Pinout & Package
LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant and ECOPACK2 certified. Pin count and layout conform to ST's standard LQFP48 footprint for drop-in PCB compatibility across STM32L0x8 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O domain decoupling; supports 1.65–3.6 V operation |
| NRST | Active-low reset input | Internal pull-up; accepts external push-button or supervisor IC assertion; complies with 83 ns minimum pulse width |
| PA0–PA15, PB0–PB15, PC13–PC15 | General-purpose I/Os | 45 total GPIOs; 45 are 5V tolerant - eliminates need for external level translation in mixed-voltage systems |
| OSC_IN / OSC_OUT | External crystal oscillator interface | Supports 1–25 MHz crystals; enables precise timing for RTC, USB, or communication protocols |
| BOOT0 | Boot mode selection | High at reset enters system memory bootloader; used for factory programming via USART/SPI |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power standby | 0.27 µA with two wakeup pins - enables multi-year operation on CR2032 batteries in wireless sensor nodes |
| ECC memory protection | 64 KB Flash and 2 KB EEPROM with error correction - prevents silent data corruption in safety-critical logging |
| Dual ultra-low-power comparators | Operate down to 1.65 V with window mode and independent wakeup capability - replaces discrete analog front-end in threshold-monitoring applications |
| Pre-programmed bootloader | USART and SPI interfaces supported - enables field firmware updates without JTAG debugger |
| Serial wire debug (SWD) | 2-pin debug interface - reduces PCB footprint vs JTAG while retaining full trace and breakpoint functionality |
Applications
| Smart Utility Metering | Wireless Sensor Node |
|---|---|
Use Scenario: Battery-powered gas/water meter with hourly pulse counting, temperature compensation, and RF transmission every 12 hours. IC Role / Device Role / Timing Role: Main controller managing metrology ADC sampling, RTC-based scheduling, and low-power UART-to-LoRaWAN bridge. Use Value: 0.8 µA Stop+RTC mode preserves 8 KB RAM for accumulated pulse counts and calibration coefficients between transmissions. | Use Scenario: Indoor air quality monitor using CO₂, VOC, and humidity sensors, transmitting data via BLE every 5 minutes. IC Role / Device Role / Timing Role: Central MCU acquiring analog sensor data, running sensor fusion algorithms, and managing BLE stack timing. Use Value: 5 µs wakeup from Flash allows rapid response to timer interrupts, minimizing active time and extending AA battery life beyond 2 years. |
| Portable Medical Device | Industrial Predictive Maintenance Sensor |
Use Scenario: Handheld pulse oximeter with OLED display, optical sensing, and USB charging detection. IC Role / Device Role / Timing Role: System-on-chip managing LED driver timing, ADC oversampling, and USB enumeration state machine. Use Value: 45 5V-tolerant I/Os directly interface with legacy display drivers and analog front-end ICs without level shifters. | Use Scenario: Vibration and temperature sensor mounted on motor housing, logging data to local EEPROM and triggering alerts via RS-485. IC Role / Device Role / Timing Role: Edge data logger with RTC timestamping, EEPROM wear leveling, and hardware CRC for data integrity. Use Value: 2 KB EEPROM with ECC retains 10+ years of calibrated sensor logs even after 100k write cycles. |
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 |
|---|---|---|---|
| STM32L071R8T7 | 128 KB Flash, 20 KB SRAM, same peripherals and pinout - higher memory density with identical power profile | Suitable for firmware-over-the-air (FOTA) implementations requiring dual-bank Flash | Select when future firmware expansion or secure boot partitioning is required |
| STM32L011K4T6 | 16 KB Flash, 2 KB SRAM, LQFP32 package - reduced memory and I/O count, lower cost | Targeted at simpler sensor endpoints with no EEPROM or advanced analog needs | Select for cost-sensitive, space-constrained designs where 64 KB Flash is unnecessary |
Compared with STM32L071R8T7, the STM32L051R8T7 trades Flash/SRAM capacity for lower unit cost and smaller die size, while retaining identical low-power behavior and peripheral set; versus STM32L011K4T6, it adds EEPROM, more I/Os, and enhanced analog features - making it optimal for mid-tier battery-powered edge nodes requiring data persistence and sensor flexibility.
Availability
STM32L051R8T7 is available at Aetrix Electronics and suitable for smart metering, portable medical devices, industrial predictive maintenance sensors, and wireless sensor networks requiring stable component supply and long-term lifecycle assurance.
Supply support for STM32L051R8T7 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, MEMS, and automotive-grade components since 1987.
The STM32L0 series targets ultra-low-power embedded applications, emphasizing sub-µA standby operation, integrated EEPROM, and robust analog peripherals for battery-operated and energy-harvesting systems.
FAQ
What is the maximum operating temperature for STM32L051R8T7?
The STM32L051R8T7 is rated for industrial temperature range: –40 °C to +125 °C. This specification is validated per ST's DS10184 Rev 10 datasheet Section 6.3.1, and applies across all low-power modes and peripheral configurations under specified voltage conditions.
Does STM32L051R8T7 support USB connectivity?
No, the STM32L051R8T7 does not integrate a USB peripheral. It provides USART, LPUART, SPI, and I²C interfaces only. For USB-enabled designs in the L0 family, ST recommends STM32L07x or STM32L053 variants, which include USB 2.0 FS controllers.
How is EEPROM endurance specified for STM32L051R8T7?
ST specifies 100,000 write/erase cycles and 20-year data retention at 55 °C for the integrated 2 KB EEPROM (DS10184 Rev 10, Table 48). ECC logic mitigates bit errors, and software wear-leveling libraries are provided in STM32CubeL0 firmware package.
Can STM32L051R8T7 run code directly from RAM?
Yes - the device supports execution from SRAM via remapping the memory address 0x00000000 to SRAM using SYSCFG_MEMRMP register. Verified in RM0377 Reference Manual Section 3.3.3; enables fast ISR handling and deterministic timing-critical routines.
STM32L051R8T7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- STM32L0
- Packaging:
- Tray
- 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:
STM32L051R8T7 FAQ
1.How can I place an order for STM32L051R8T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L051R8T7 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 STM32L051R8T7 reliable?
The price and inventory of STM32L051R8T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L051R8T7 is usually 5 days.
3.What payment methods are accepted for STM32L051R8T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L051R8T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L051R8T7?
STM32L051R8T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L051R8T7 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 STM32L051R8T7?
For technical support, including STM32L051R8T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L051R8T7 requirements.
6.How does Aetrix verify that STM32L051R8T7 is sourced from the original manufacturer or authorized distributors?
All STM32L051R8T7 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 STM32L051R8T7 meets industry standards.
7.What is the process for return or replacement of STM32L051R8T7?
All STM32L051R8T7 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L051R8T7, 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 STM32L051R8T7 part is unused and in its original packaging.
Return procedure for STM32L051R8T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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