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STMicroelectronics STM32L051K8U6DTR
- Part No.:
- STM32L051K8U6DTR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L051K8U6DTR.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,344
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Product details
Overview
STM32L051K8U6DTR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 64 KB Flash, 8 KB SRAM, 2 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and dual ultra-low-power comparators. It operates from 1.65–3.6 V across –40 to +125 °C and delivers 0.27 µA Standby current with 2 wakeup pins - deployed in battery-powered sensor nodes and portable medical monitors.
For engineers reviewing the STM32L051K8U6DTR datasheet, STM32L051K8U6DTR pinout, STM32L051K8U6DTR application, or STM32L051K8U6DTR equivalent, key selection criteria include verified low-power mode timing (3.5 µs RAM wakeup), 45 I/Os with 5V tolerance, integrated RTC + backup registers, and support for ISO 7816/IRDA via dual USARTs.
Technical Context
The STM32L051K8U6DTR implements a Cortex-M0+ core with Memory Protection Unit (MPU), running at up to 32 MHz with 0.95 DMIPS/MHz performance. Its clock system integrates multiple internal oscillators (16 MHz HSI, 37 kHz LSI, 65 kHz–4.2 MHz MSI) plus external 1–25 MHz crystal and 32 kHz RTC oscillator with calibration.
Power management includes five BOR thresholds, programmable voltage detector (PVD), and three low-power modes: Stop (0.4 µA), Stop+RTC+RAM retention (0.8 µA), and Standby (0.27 µA). Analog subsystem comprises a 12-bit ADC with 16-channel multiplexing down to 1.65 V supply and two comparators supporting window mode and wake-up capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+ with MPU, 32 MHz max - enables deterministic real-time control with memory isolation for firmware safety. |
| Flash / SRAM / EEPROM | 64 KB Flash with ECC, 8 KB SRAM, 2 KB EEPROM with ECC - ensures code/data integrity and nonvolatile parameter storage without external components. |
| ADC | 12-bit, 1.14 Msps, 16-channel, operational down to 1.65 V - supports high-resolution sensor acquisition in single-supply battery systems. |
| Low-power modes | 0.27 µA Standby (2 wakeup pins), 0.4 µA Stop (16 wakeup lines), 0.8 µA Stop+RTC+8 KB RAM retention - extends coin-cell life to multi-year operation. |
| I/O count & tolerance | Up to 51 fast I/Os; 45 are 5V tolerant - simplifies interface with legacy peripherals and mixed-voltage logic without level shifters. |
| Communication interfaces | 2× USART (ISO 7816, IrDA), 1× LPUART, 4× SPI (16 Mbit/s), 2× I2C (SMBus/PMBus) - enables secure smart-card comms, low-power telemetry, and sensor hub connectivity. |
| Timers & watchdogs | 9 timers including 16-bit ultra-low-power LPTIM, RTC, SysTick, 2× watchdogs (independent/window) - provides precise timekeeping, event scheduling, and fail-safe reset coverage. |
Pinout & Package
STM32L051K8U6DTR uses the UFQFPN32 (5 × 5 mm) package with 32-pin quad flat no-lead construction, optimized for space-constrained PCB layouts and automated assembly. Pin functions align with STM32L051x8 series pin definitions per datasheet Table 15.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power/ground pairs ensure stable core and I/O domain operation; decoupling required per datasheet Section 6.1.6. |
| PA0–PA15, PB0–PB11 | General-purpose I/O | 45 of 51 I/Os are 5V tolerant; all support alternate functions including USART, SPI, I2C, and timer channels. |
| NRST | Active-low reset input | Internal pull-up; accepts external reset pulse ≥ 20 ns wide; supports brownout, POR, and software-initiated reset sources. |
| BOOT0 | Boot mode selection | High at reset enables system memory bootloader; tied low for normal Flash execution - critical for field firmware updates. |
| OSC_IN / OSC_OUT | External crystal oscillator inputs | Supports 1–25 MHz crystals; enables precise timing for USB, RTC, or communication baud rate accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| ECC-protected memories | 64 KB Flash and 2 KB EEPROM include error correction - prevents silent data corruption in long-life industrial deployments. |
| Ultra-low-power comparators | 2x comparators with window mode and wake-up from Stop/Standby - enables battery voltage monitoring and analog event detection without CPU wake. |
| Pre-programmed bootloader | Factory-loaded USART/SPI bootloader - allows firmware updates over serial interface without debugger hardware. |
| Serial wire debug (SW-DP) | 2-pin debug interface with full SWD protocol support - enables non-intrusive real-time debugging and flash programming in production test. |
| Temperature sensor & VREFINT | Calibrated on-chip temperature sensor and internal 1.22 V reference - eliminates need for external sensing components in thermal monitoring applications. |
Applications
| Smart Utility Meter | Wearable Health Monitor |
|---|---|
Use Scenario: Battery-powered electricity/water meter logging consumption data hourly and transmitting via NB-IoT/LPWAN. IC Role / Device Role / Timing Role: Main controller managing sensor sampling (current/voltage transformers), RTC-based timestamping, secure data encryption, and low-duty-cycle radio wake-up. Use Value: 0.27 µA Standby current and 3.5 µs RAM wakeup enable >10-year coin-cell operation while maintaining accurate timekeeping and rapid response to network events. |
Use Scenario: Compact wrist-worn device measuring heart rate (PPG), skin temperature, and motion (via external IMU). IC Role / Device Role / Timing Role: Sensor fusion hub acquiring analog PPG/temperature signals, processing raw data in SRAM, and triggering BLE transmission only on anomaly detection. Use Value: 12-bit ADC with 1.14 Msps and dual comparators allow simultaneous high-fidelity biosignal capture and threshold-triggered wake-up - minimizing active time and extending charge cycle. |
| Industrial Wireless Sensor Node | Asset Tracking Beacon |
Use Scenario: Enclosed vibration/temperature/humidity node in factory machinery, reporting condition data every 5 minutes via LoRaWAN. IC Role / Device Role / Timing Role: System-on-chip managing multi-sensor polling, CRC-protected data packaging, adaptive sleep scheduling, and RF interface handshaking. Use Value: 2 KB EEPROM retains calibration coefficients and device identity across power cycles; 5V-tolerant I/Os simplify connection to legacy analog sensors without level-shifting circuitry. |
Use Scenario: GPS-denied indoor logistics tag using UWB or BLE AoA to report location and tamper status to gateway. IC Role / Device Role / Timing Role: Low-latency event processor detecting accelerometer-based impact/tamper, logging timestamps in backup registers, and initiating encrypted beacon broadcast. Use Value: 20-byte backup register + RTC preserves critical event history during battery replacement; 0.4 µA Stop mode with 16 wakeup lines supports multi-sensor interrupt aggregation without leakage penalty. |
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 |
|---|---|---|---|
| STM32L071K8U6 | 128 KB Flash, 20 KB SRAM, same peripherals and pinout - higher memory headroom for complex stacks. | Suitable for applications requiring larger OTA firmware images or extended local data buffering. | Select when future firmware growth or dual-bank Flash update capability is required; identical footprint and migration path. |
| STM32L011K4U6 | 16 KB Flash, 2 KB SRAM, no EEPROM, reduced timer/peripheral count - smaller memory and feature set. | Targeted at cost-sensitive, functionally minimal designs like simple status indicators or basic sensor readouts. | Choose for lowest BOM cost where 64 KB Flash and 2 KB EEPROM are unnecessary; shares UFQFPN32 package but lacks RTC calibration and comparator window mode. |
Compared with STM32L051K8U6DTR, STM32L071K8U6 offers scalable memory for evolving firmware, while STM32L011K4U6 reduces cost and complexity for fixed-function endpoints - both retain identical low-power architecture and package compatibility.
Availability
STM32L051K8U6DTR is available at Aetrix Electronics and suitable for battery-powered sensor nodes, portable medical monitors, and industrial wireless sensor networks requiring stable component supply and long-term manufacturability.
Supply support for STM32L051K8U6DTR 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, designing and manufacturing microcontrollers, power ICs, MEMS, and automotive semiconductors since 1987.
The STM32L0 Access line targets ultra-low-power embedded applications demanding extended battery life, robust security, and compact form factor - optimized for IoT edge nodes and portable electronics.
FAQ
What is the maximum operating frequency and core type of STM32L051K8U6DTR?
The STM32L051K8U6DTR features an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS/MHz performance. It includes a Memory Protection Unit (MPU) for enhanced firmware reliability. The maximum frequency is achievable across the full 1.65–3.6 V supply range with dynamic voltage scaling enabled.
Does STM32L051K8U6DTR support hardware encryption or secure boot?
No - the STM32L051K8U6DTR does not integrate hardware AES, PKA, or secure boot engines. It relies on software-based cryptographic libraries and external secure elements for advanced security. However, it supports readout protection (RDP) Level 1/2 and write protection for Flash/EEPROM sectors to prevent unauthorized access.
Can STM32L051K8U6DTR operate from a 1.8 V supply, and what peripherals remain functional?
Yes - the device operates from 1.65 V to 3.6 V. At 1.8 V, the 12-bit ADC remains fully functional (down to 1.65 V), both comparators operate, and all timers (including RTC and LPTIM) retain accuracy. However, maximum CPU frequency is reduced to 16 MHz, and some high-speed peripheral modes (e.g., 16 Mbit/s SPI) are disabled per datasheet Table 4.
Is the UFQFPN32 package RoHS-compliant and halogen-free?
Yes - the STM32L051K8U6DTR in UFQFPN32 package meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. It carries ECOPACK2 certification, confirming compliance with ST's environmental standards for lead-free assembly and material content.
STM32L051K8U6DTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM32L0
- Packaging:
- Tape & Reel (TR)
- 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:
STM32L051K8U6DTR FAQ
1.How can I place an order for STM32L051K8U6DTR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L051K8U6DTR 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 STM32L051K8U6DTR reliable?
The price and inventory of STM32L051K8U6DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L051K8U6DTR is usually 5 days.
3.What payment methods are accepted for STM32L051K8U6DTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L051K8U6DTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L051K8U6DTR?
STM32L051K8U6DTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L051K8U6DTR 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 STM32L051K8U6DTR?
For technical support, including STM32L051K8U6DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L051K8U6DTR requirements.
6.How does Aetrix verify that STM32L051K8U6DTR is sourced from the original manufacturer or authorized distributors?
All STM32L051K8U6DTR 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 STM32L051K8U6DTR meets industry standards.
7.What is the process for return or replacement of STM32L051K8U6DTR?
All STM32L051K8U6DTR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L051K8U6DTR, 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 STM32L051K8U6DTR part is unused and in its original packaging.
Return procedure for STM32L051K8U6DTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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