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STMicroelectronics STM32L051K8U6
- Part No.:
- STM32L051K8U6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L051K8U6.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,859
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Product details
Overview
STM32L051K8U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 64 KB Flash with ECC, 8 KB SRAM, 2 KB EEPROM with ECC, 12-bit ADC (1.14 Msps, 16 channels), and dual ultra-low-power comparators. It operates from 1.65–3.6 V across –40 to +125 °C and targets battery-powered IoT sensors and smart meters requiring sub-µA standby current (0.27 µA) and fast wakeup (3.5 µs from RAM).
For engineers reviewing the STM32L051K8U6 datasheet, STM32L051K8U6 pinout, STM32L051K8U6 application, or STM32L051K8U6 equivalent, key selection criteria include verified ultra-low-power mode current specs (Stop: 0.4 µA; Standby: 0.27 µA), 5V-tolerant I/O count (45 pins), integrated EEPROM endurance (100k cycles), and SWD debug support for embedded firmware development.
Technical Context
The STM32L051K8U6 integrates an Arm Cortex-M0+ core with MPU, running at up to 32 MHz using multiple clock sources: HSI16 (±1%), LSE (32 kHz RTC), MSI (65 kHz–4.2 MHz), and PLL. Its power architecture supports five low-power modes-Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby-with configurable voltage scaling and retention options (e.g., 8 KB RAM + RTC in Stop mode at 0.8 µA).
Analog subsystem includes a 12-bit ADC with hardware oversampling, two independent comparators supporting window mode and wake-up from Stop/Standby, and internal reference (VREFINT) calibrated for temperature sensing. Peripheral interconnect uses a dedicated AHB/APB matrix enabling concurrent DMA transfers to ADC, USART, SPI, I²C, and timers without CPU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+ @ up to 32 MHz; 0.95 DMIPS/MHz; MPU for memory protection in safety-critical tasks. |
| Memory | 64 KB Flash with ECC (100k write/erase cycles); 8 KB SRAM; 2 KB EEPROM with ECC (100k cycles, 20-year retention). |
| Power Consumption | 0.27 µA Standby (2 wakeup pins); 0.4 µA Stop (16 wakeup lines); 88 µA/MHz Run mode; 3.5 µs wakeup from RAM. |
| Analog Peripherals | 12-bit ADC: 1.14 Msps, 16-channel, operational down to 1.65 V; 2x comparators with wake-up capability down to 1.65 V. |
| 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). |
| Clock Sources | HSI16 (16 MHz, ±1% factory-trimmed), LSE (32 kHz RTC), MSI (65 kHz–4.2 MHz), PLL for CPU clock multiplication. |
| Debug & Boot | Serial Wire Debug (SWD); pre-programmed USART/SPI bootloader; 96-bit unique ID; CRC calculation unit. |
Pinout & Package
STM32L051K8U6 is housed in a 32-pin UFQFPN (5×5 mm, 0.5 mm pitch) package compliant with ECOPACK2 environmental standards. The package supports reflow soldering and offers compact footprint for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 1.65–3.6 V supply for digital and analog domains; decoupling required per datasheet layout guidelines. |
| VSS | Ground | Digital ground reference; separate analog ground (VSSA) available for noise-sensitive ADC operation. |
| NRST | Reset input | Active-low reset with internal pull-up; accepts external push-button or supervisor IC assertion. |
| PA0–PA15 | General-purpose I/O | Up to 16 GPIOs on Port A; many support alternate functions (ADC_IN0–IN15, TIM2_CH1, USART2_TX/RX, etc.). |
| PB0–PB11 | General-purpose I/O | 12 GPIOs on Port B; includes I²C1_SCL/SDA, SPI1_SCK/MOSI/MISO, LPUART1_TX/RX, and comparator inputs. |
| BOOT0 | Boot mode select | High at reset enables system memory bootloader; low selects main Flash memory execution. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power standby | 0.27 µA with two wakeup pins enabled - enables >10-year battery life in coin-cell–powered sensor nodes. |
| Integrated EEPROM | 2 KB data EEPROM with ECC and 100k write/erase cycles - eliminates need for external serial EEPROM in data-logging applications. |
| ADC with hardware oversampling | 12-bit resolution at 1.14 Msps, extendable to 16-bit effective via 256× oversampling - supports high-accuracy sensor signal acquisition without external precision ADC. |
| Dual ultra-low-power comparators | Operate down to 1.65 V supply and support window mode detection with independent output and wake-up capability - enables autonomous threshold monitoring in battery-depleted states. |
| Flexible clock system | MSI oscillator tunable from 65 kHz to 4.2 MHz with automatic calibration - allows dynamic clock scaling to match real-time processing load and minimize active power. |
Applications
| Smart Utility Metering | Wireless Sensor Node |
|---|---|
|
Use Scenario: Battery-powered gas/water meter with pulse counting, temperature compensation, and periodic RF transmission. IC Role / Device Role / Timing Role: Main system controller managing sensor interface (ADC, comparators), RTC-based billing intervals, and low-power UART/LPUART for modem communication. Use Value: 0.27 µA Standby current extends 3.6 V lithium-thionyl chloride battery life beyond 15 years; integrated EEPROM stores calibration and usage logs securely. |
Use Scenario: Environmental monitoring node (temperature/humidity/pressure) transmitting data via BLE or LoRaWAN every 5 minutes. IC Role / Device Role / Timing Role: Central MCU coordinating multi-sensor polling, data preprocessing, and scheduled radio wake-up using LPTIM and RTC alarms. Use Value: 0.4 µA Stop mode with 16 wakeup lines enables precise event-driven sampling; 5V-tolerant I/O simplifies direct connection to industrial sensors without level shifters. |
| Portable Medical Device | Industrial Control Panel |
|
Use Scenario: Handheld blood glucose monitor with LCD display, button interface, and USB charging detection. IC Role / Device Role / Timing Role: System-on-chip handling analog front-end (ADC for test strip reading), capacitive touch buttons, and USB VBUS monitoring via comparator. Use Value: Dual comparators operate at 1.65 V minimum supply - ensures reliable VBUS presence detection even during deep discharge; 3.5 µs wakeup from RAM enables instant UI response. |
Use Scenario: DIN-rail mounted HMI module with rotary encoder, LED indicators, and RS-485 Modbus interface. IC Role / Device Role / Timing Role: Real-time controller executing deterministic state machine logic, driving GPIOs for LEDs/relays, and managing half-duplex RS-485 via USART with auto-direction control. Use Value: 45 5V-tolerant I/Os eliminate external bus buffers; 2x I²C interfaces support local sensor expansion (e.g., ambient light, humidity) without additional level translation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L071K8U6 | Same package and pinout; adds 1 KB of true static RAM (vs. 8 KB SRAM shared with cache), 128 KB Flash, and enhanced crypto acceleration (AES-128). | Required for applications needing larger code storage or hardware AES for secure firmware updates or OTA encryption. | Select when >64 KB Flash or cryptographic primitives are mandatory; otherwise, STM32L051K8U6 offers lower cost and identical ultra-low-power profile. |
| EFM32PG12B500F1024GL125 | ARM Cortex-M4F core; higher performance (40 MHz), 1024 KB Flash, 256 KB RAM; deeper sleep modes (0.17 µA Deep Sleep) but no integrated EEPROM. | Suitable for complex edge-processing tasks (e.g., FFT-based vibration analysis) where computational headroom outweighs EEPROM dependency. | Choose only if floating-point math or large buffer requirements justify added complexity and cost; lacks on-chip EEPROM, requiring external nonvolatile storage. |
Compared with STM32L071K8U6, the STM32L051K8U6 trades Flash capacity and crypto features for lower BOM cost and identical ultra-low-power behavior; versus EFM32PG12B, it delivers proven EEPROM integration and simpler toolchain support at the expense of raw compute throughput.
Availability
STM32L051K8U6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and industrial control panels requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for STM32L051K8U6 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 semiconductors since 1987.
The STM32L0 series is ST's entry-level ultra-low-power Arm Cortex-M0+ MCU line, engineered specifically for energy-harvesting and battery-operated applications demanding sub-microamp standby, integrated nonvolatile memory, and robust analog peripherals in minimal footprint packages.
FAQ
What is the maximum operating frequency and core type of the STM32L051K8U6?
The STM32L051K8U6 features an Arm Cortex-M0+ core rated for up to 32 MHz operation. Its performance is specified at 0.95 DMIPS/MHz, delivering predictable real-time execution while maintaining ultra-low power consumption. Frequency scaling is supported via dynamic voltage regulation and multiple internal clock sources including HSI16, MSI, and PLL.
Does the STM32L051K8U6 include built-in nonvolatile memory beyond Flash?
Yes - it integrates 2 KB of data EEPROM with error-correcting code (ECC) and guaranteed 100,000 write/erase cycles plus 20-year data retention. This eliminates reliance on external serial EEPROM for parameter storage, calibration data, or event logging in field-deployed devices.
How many I/O pins are 5V tolerant, and what is the package type?
45 of the 51 general-purpose I/Os are 5V tolerant, enabling direct interfacing with legacy industrial sensors and logic without level-shifting circuitry. The STM32L051K8U6 uses a 32-pin UFQFPN package (5×5 mm, 0.5 mm pitch), optimized for compact PCB layouts and automated assembly.
What debug interface does the STM32L051K8U6 support, and is a bootloader pre-programmed?
It supports Serial Wire Debug (SWD) for full-featured programming and real-time debugging via standard JTAG/SWD probes. A factory-pre-programmed system memory bootloader is included, accessible via USART or SPI, allowing firmware updates without a debugger - critical for field maintenance and remote device recovery.
STM32L051K8U6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- 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, POR, PWM, WDT
- Number of I/O:
- 27
- 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 10x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L051K8U6 FAQ
1.How can I place an order for STM32L051K8U6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L051K8U6 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 STM32L051K8U6 reliable?
The price and inventory of STM32L051K8U6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L051K8U6 is usually 5 days.
3.What payment methods are accepted for STM32L051K8U6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L051K8U6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L051K8U6?
STM32L051K8U6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L051K8U6 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 STM32L051K8U6?
For technical support, including STM32L051K8U6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L051K8U6 requirements.
6.How does Aetrix verify that STM32L051K8U6 is sourced from the original manufacturer or authorized distributors?
All STM32L051K8U6 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 STM32L051K8U6 meets industry standards.
7.What is the process for return or replacement of STM32L051K8U6?
All STM32L051K8U6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L051K8U6, 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 STM32L051K8U6 part is unused and in its original packaging.
Return procedure for STM32L051K8U6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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