My Inquiry
My Account
STMicroelectronics STM32L051K8U7TR
- Part No.:
- STM32L051K8U7TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L051K8U7TR.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,872
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
STM32L051K8U7TR 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, and a 12-bit ADC operating up to 1.14 Msps. It delivers 0.95 DMIPS/MHz performance at up to 32 MHz and supports 45 5V-tolerant I/Os. It is deployed in battery-powered IoT sensor nodes requiring sub-µA standby current and fast wake-up.
For engineers reviewing the STM32L051K8U7TR datasheet, STM32L051K8U7TR pinout, STM32L051K8U7TR application, or STM32L051K8U7TR equivalent, key selection criteria include verified ultra-low-power mode currents (0.27 µA Standby), integrated EEPROM endurance (100k cycles), 5V-tolerant GPIO count, RTC + RAM retention capability, and SWD debug support.
Technical Context
The STM32L051K8U7TR integrates an Arm Cortex-M0+ core with Memory Protection Unit (MPU), supporting dynamic voltage scaling across three power ranges (1.65–3.6 V). Its clock system combines multiple internal oscillators (HSI16, LSI, MSI) and external sources (1–25 MHz HSE, 32 kHz LSE), with PLL for CPU clock generation.
Low-power operation is enabled by seven distinct modes - including Stop mode with RTC + 8 KB RAM retention at 0.8 µA and Standby mode at 0.27 µA - managed via dedicated reset and supply control logic with programmable voltage detector (PVD) and brownout reset (BOR) thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+ with MPU, 0.95 DMIPS/MHz @ 32 MHz - enables deterministic real-time control in resource-constrained edge devices. |
| Flash / EEPROM | 64 KB Flash with ECC, 2 KB data EEPROM with ECC - ensures firmware integrity and non-volatile parameter storage without external components. |
| RAM | 8 KB SRAM - sufficient for RTOS task stacks, sensor buffering, and BLE stack operation in compact nodes. |
| ADC | 12-bit, 1.14 Msps, 16-channel - supports high-resolution analog sensing (e.g., temperature, pressure) down to 1.65 V supply. |
| Low-Power Modes | 0.27 µA Standby (2 wakeup pins), 0.8 µA Stop + RTC + 8 KB RAM - enables multi-year battery life in periodic wake-up applications. |
| I/O Voltage Tolerance | 45 I/Os 5V tolerant - simplifies interface with legacy 5V peripherals without level shifters. |
| Debug Interface | Serial Wire Debug (SW-DP) - provides full visibility into runtime behavior with minimal pin overhead. |
Pinout & Package
STM32L051K8U7TR uses the UFQFPN32 (5 × 5 mm) package with 32 leads, compliant with ECOPACK2 environmental standards. Pin assignments are validated per STMicroelectronics datasheet DS10184 Rev 10, Section 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O domain operation; decoupling required per datasheet layout guidelines. |
| PA0–PA15, PB0–PB11 | General-purpose I/O | 45 total I/Os (32 accessible in UFQFPN32); 45 support 5V tolerance - enables direct interfacing with industrial sensors and actuators. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts 1.65–3.6 V logic - compatible with external supervisor ICs or push-button circuits. |
| SYSCLK, SWDIO, SWCLK | System clock and debug interface | SWD pins enable programming and real-time debugging using standard ST-LINK v2/v3 tools without JTAG overhead. |
| VBAT | RTC backup supply | Supports RTC and 20-byte backup registers during main power loss - extends timekeeping functionality in energy-harvesting systems. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power BOR | 5 selectable brownout reset thresholds - allows precise power-fail detection across varying battery discharge curves. |
| Integrated EEPROM | 2 KB with ECC and 100k write/erase cycles - eliminates need for external serial EEPROM in calibration data or device configuration storage. |
| Ultra-low-power comparators | 2x comparators with window mode and wake-up capability down to 1.65 V - enables autonomous analog event detection without CPU intervention. |
| Multi-speed internal RC | MSI oscillator spanning 65 kHz to 4.2 MHz - provides flexible clock source for low-power peripherals without external crystal. |
| Pre-programmed bootloader | USART and SPI interfaces supported - enables field firmware updates without debugger hardware. |
Applications
| Smart Utility Metering | Wearable Health Monitor |
|---|---|
Use Scenario: Battery-operated gas/water meter with hourly pressure/flow sampling and LoRaWAN transmission. IC Role / Device Role / Timing Role: Main controller managing sensor acquisition, RTC-based scheduling, AES encryption, and low-power radio interface timing. Use Value: 0.27 µA Standby current extends 10-year battery life; integrated 2 KB EEPROM stores calibration offsets and usage logs securely. | Use Scenario: ECG patch with continuous analog front-end sampling, motion artifact correction, and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Signal processor executing FIR filtering and peak detection; RTC synchronizes data bursts to conserve RF duty cycle. Use Value: 12-bit ADC at 1.14 Msps captures high-fidelity biopotentials; 0.8 µA Stop + RTC + 8 KB RAM retains context during sleep between samples. |
| Industrial Wireless Sensor Node | Asset Tracking Beacon |
Use Scenario: Vibration and temperature node on rotating machinery, transmitting alerts via NB-IoT every 5 minutes. IC Role / Device Role / Timing Role: Host MCU coordinating accelerometer data capture, FFT preprocessing, and cellular modem handshaking. Use Value: 45 5V-tolerant I/Os interface directly with legacy industrial transducers; SWD debug enables in-field firmware validation. | Use Scenario: GPS-denied indoor asset tag using BLE proximity and accelerometer-based motion detection. IC Role / Device Role / Timing Role: Low-power state manager triggering BLE advertising only upon movement detected by ultra-low-power comparator. Use Value: Comparator wake-up capability reduces average current to <1 µA; 3.5 µs wake-up from RAM ensures rapid response to motion events. |
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 |
|---|---|---|---|
| STM32L071K8U7TR | 128 KB Flash, 20 KB RAM, same package and peripheral set - adds memory headroom for larger protocol stacks. | Preferred where BLE mesh or OTA update code size exceeds 64 KB Flash limit. | Select when future firmware expansion or dual-bank bootloading is required. |
| STM32L011K4U7TR | 16 KB Flash, 2 KB RAM, identical ultra-low-power specs - scaled-down memory and fewer timers. | Suitable for simple timer-based or GPIO-triggered tasks without complex signal processing. | Choose for cost-sensitive, single-function nodes with minimal firmware footprint. |
Compared with STM32L051K8U7TR, STM32L071K8U7TR offers double Flash/RAM for protocol-rich deployments, while STM32L011K4U7TR reduces cost and power for basic control - all share identical low-power architecture, pin compatibility in UFQFPN32, and SWD debug interface.
Availability
STM32L051K8U7TR is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, portable medical devices, and industrial wireless monitoring requiring stable component supply and long-term lifecycle assurance.
Supply support for STM32L051K8U7TR 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, and MEMS sensors for industrial, automotive, and consumer markets.
The STM32L0 series targets ultra-low-power embedded applications, emphasizing sub-µA standby operation, integrated non-volatile memory, and robust analog peripherals for energy-constrained edge devices.
FAQ
What is the maximum operating frequency and core type of STM32L051K8U7TR?
The STM32L051K8U7TR features an Arm Cortex-M0+ core with MPU, operating at up to 32 MHz. It delivers 0.95 DMIPS/MHz performance and supports dynamic voltage scaling across three power ranges (1.65–3.6 V), enabling optimized trade-offs between speed and current consumption in real-time applications.
Does STM32L051K8U7TR support 5V-tolerant I/Os, and how many are available in UFQFPN32?
Yes, STM32L051K8U7TR supports 5V-tolerant I/Os: 45 pins in total are 5V tolerant, and 32 of these are accessible in the UFQFPN32 package. This eliminates external level-shifting circuitry when interfacing with legacy 5V sensors, displays, or communication modules.
What ultra-low-power modes are supported, and what are their typical current draws?
The device supports Standby mode at 0.27 µA (2 wakeup pins), Stop mode at 0.4 µA (16 wakeup lines), and Stop mode with RTC + 8 KB RAM retention at 0.8 µA. All values are measured at 25 °C and 3.0 V supply, per DS10184 Rev 10 Section 6.3.32–33.
Is there integrated EEPROM, and what is its endurance and error-correction capability?
Yes, STM32L051K8U7TR includes 2 KB of data EEPROM with built-in ECC protection and rated for 100,000 write/erase cycles with 40-year data retention at 55 °C. This enables reliable storage of calibration data, device IDs, or configuration parameters without external memory.
STM32L051K8U7TR 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L051K8U7TR FAQ
1.How can I place an order for STM32L051K8U7TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L051K8U7TR 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 STM32L051K8U7TR reliable?
The price and inventory of STM32L051K8U7TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L051K8U7TR is usually 5 days.
3.What payment methods are accepted for STM32L051K8U7TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L051K8U7TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L051K8U7TR?
STM32L051K8U7TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L051K8U7TR 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 STM32L051K8U7TR?
For technical support, including STM32L051K8U7TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L051K8U7TR requirements.
6.How does Aetrix verify that STM32L051K8U7TR is sourced from the original manufacturer or authorized distributors?
All STM32L051K8U7TR 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 STM32L051K8U7TR meets industry standards.
7.What is the process for return or replacement of STM32L051K8U7TR?
All STM32L051K8U7TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L051K8U7TR, 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 STM32L051K8U7TR part is unused and in its original packaging.
Return procedure for STM32L051K8U7TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM32L051K8U7TR Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
