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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersSTM32L051K8U6
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STM32L051K8U6 - STMicroelectronics

Manufacturer Part Number
STM32L051K8U6
Manufacturer
STMicroelectronics
Allelco Part Number
32D-STM32L051K8U6
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
18,677 pcs available, New & Original
Parts Description
IC MCU 32BIT 64KB FLASH 32UFQFPN
Package
32-UFQFPN (5x5)
Data sheet
STM32L051K8U6.pdf

PCN Assembly/Origin

STM8/STM32 10/Mar/2020.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 18677
  • Unit Price: $0.971
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $0.971 $0.97
10+ $0.812 $8.12
30+ $0.724 $21.72
100+ $0.626 $62.60
490+ $0.581 $284.69
980+ $0.563 $551.74
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

STM32L051K8U6 Tech Specifications
STMicroelectronics - STM32L051K8U6 technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - STM32L051K8U6

Product Attribute Attribute Value
Manufacturer STMicroelectronics
Voltage - Supply (Vcc/Vdd) 1.65V ~ 3.6V
Supplier Device Package 32-UFQFPN (5x5)
Speed 32MHz
Series STM32L0
RAM Size 8K x 8
Program Memory Type FLASH
Program Memory Size 64KB (64K x 8)
Peripherals Brown-out Detect/Reset, DMA, POR, PWM, WDT
Package / Case 32-UFQFN Exposed Pad
Package Tray
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Number of I/O 27
Mounting Type Surface Mount
EEPROM Size 2K x 8
Data Converters A/D 10x12b
Core Size 32-Bit Single-Core
Core Processor ARM® Cortex®-M0+
Connectivity I²C, IrDA, SPI, UART/USART
Base Product Number STM32L051

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN 3A991A2
HTSUS 8542.31.0001

Parts Introduction

STM32L051K8U6 Image
STM32L051K8U6 (1)

Manufacturer Part Number

STM32L051K8U6

Manufacturer

STMicroelectronics

STM32L051K8U6 Image
STM32L051K8U6 (2)

Introduction

Embedded microcontroller from STM32L0 series with a 32-bit ARM Cortex-M0+ core

Product Features and Performance

32MHz maximum clock frequency, ARM Cortex-M0+ 32-bit core

64KB Flash memory, 8KB RAM, 2KB EEPROM for data storage

I2C, IrDA, SPI, UART/USART interfaces for connectivity

PWM, DMA, POR, BOD, and WDT among the peripherals for added functionality

10-channel, 12-bit A/D converters for analog signal processing

27 I/O ports for versatile peripheral connections

Product Advantages

Low power consumption suitable for battery-operated devices

High integration to minimize external components and reduce system cost

Robust operating temperature range from -40°C to 85°C for reliability in extreme conditions

STM32L051K8U6 Image
STM32L051K8U6 (3)

Key Technical Parameters

Core Size: 32-bit single core

Speed: 32MHz

Program Memory Size: 64KB

EEPROM Size: 2KB

RAM Size: 8KB

Voltage Supply: 1.65V to 3.6V

Operating Temperature: -40°C to 85°C

Mounting Type: Surface Mount

Package: 32-UFQFPN (5x5)

Quality and Safety Features

Brown-out Detect/Reset for voltage level monitoring

Internal Oscillator reduces the need for external clock sources

Compatibility

Compatible with multiple communication protocols

Surface-mounted 32-UFQFN exposed pad for PCB integration

STM32L051K8U6 Image
STM32L051K8U6 (4)

Application Areas

Suitable for low-power and cost-sensitive applications like wearables, IoT devices and industrial controllers

Product Lifecycle

Status: Active, not nearing discontinuation

Availability of replacements or upgrades for future scalability

Several Key Reasons to Choose This Product

Energy-efficient design extending battery life for portable devices

High system integration saves on external components and cost

Extensive community support and resources, as common within STMicroelectronics products

Flexible and versatile I/O options support a wide range of sensors and peripherals

STM32L0 series offers a scalable pathway for various application demands

Suitable for challenging environmental conditions due to its wide operating temperature range

An established ecosystem with development tools for rapid prototyping and development

STMicroelectronics' reputation for reliability and performance in the microcontroller market

Frequently Asked Questions(FAQ)

How does the STM32L051K8U6 compare to other STM32L0 series microcontrollers in terms of power consumption and memory configuration for battery-powered applications?
The STM32L051K8U6 features ultra-low-power architecture with a 32MHz ARM Cortex-M0+ core, 64KB Flash, and 8KB RAM, making it suitable for energy-constrained designs. Compared to higher-end L0 variants like the STM32L071 (with more memory and peripherals), the K8 offers a cost-optimized profile while maintaining comparable active and sleep mode current draw—typically under 10µA in STOP mode at 2.0V. Its 2KB EEPROM and reduced I/O count reflect a deliberate trade-off for applications where flash and RAM beyond 64KB are unnecessary, thus lowering overall system cost without significantly impacting power efficiency.
What is the impact of the STM32L051K8U6’s internal oscillator on timing accuracy in precision sensor data acquisition systems?
The STM32L051K8U6 relies on an internal RC oscillator clocked at up to 32MHz with typical ±2% frequency tolerance over temperature and voltage. While this suffices for many general-purpose timing needs, it may introduce timing drift in high-resolution sensor sampling applications requiring sub-millisecond precision. For such cases, external crystals or MEMS oscillators are preferred. However, the MCU supports calibration routines to improve internal oscillator accuracy, and its low-power operation allows periodic re-calibration during idle cycles without major energy overhead.
Can the STM32L051K8U6 drive capacitive touch sensors effectively using its built-in peripherals?
Yes, the STM32L051K8U6 includes capacitive-touch sensing capabilities through its advanced analog front end (AFE) integrated into the GPIO pins. With support for charge-transfer measurement and noise filtering, it can interface directly with mutual-capacitance touch sensors. However, due to its limited number of I/O (27 total) and absence of dedicated capacitive-touch timers found in some higher-end L0 models, complex multi-sensor arrays may require external controllers. The 1.65–3.6V supply range also ensures compatibility with most capacitive sensor materials used in industrial or consumer HMI applications.
How does the STM32L051K8U6 handle brown-out detection and reset behavior when operating from a lithium coin cell with fluctuating voltage?
The STM32L051K8U6 integrates multiple reset sources including Power-On Reset (POR), Brown-Out Reset (BOR), and programmable voltage monitoring. It supports configurable BOR levels down to 1.65V, which is critical when powered by a degrading lithium cell that may dip below nominal 3V. The device automatically resets if VDD drops below the selected threshold, preventing erratic operation. This feature, combined with its wide operating voltage range, enhances reliability in long-life battery applications such as medical wearables or environmental monitors.
Is the STM32L051K8U6 suitable for UART-based communication over long distances using RS-485 transceivers?
The STM32L051K8U6 provides full-duplex UART/USART interfaces capable of baud rates up to 9 Mbps, enabling robust serial communication. When paired with RS-485 transceiver ICs like the MAX485 or SN75176, it supports differential signaling over longer cable runs (up to 1200 meters). Its DMA capability allows efficient handling of large data frames without CPU intervention, reducing latency. However, users must implement proper termination, slew-rate control, and software flow management to avoid signal reflections and ensure data integrity in industrial networks.
What are the implications of using the STM32L051K8U6 in a system requiring frequent firmware updates via USB?
Although the STM32L051K8U6 lacks native USB hardware, it can emulate USB using bit-banging techniques over its GPIO pins. This approach consumes significant CPU cycles and increases bootloader complexity. For reliable USB DFU (Device Firmware Update) functionality, consider MCUs with integrated USB OTG, such as the STM32L4 series. If USB is essential, an external USB-to-serial bridge may be preferable. Otherwise, the L051K8U6 supports UART or SWD-based update methods that are simpler and more power-efficient for field updates.
How does the 32-UFQFPN (5x5) package of the STM32L051K8U6 affect thermal performance in dense PCB layouts?
The compact 32-pin UFQFPN package measures only 5mm × 5mm with an exposed thermal pad, improving heat dissipation compared to smaller QFN packages. However, its small size limits surface area for conduction cooling in high-current scenarios. In typical low-power operation (<100mA average), thermal performance is adequate due to the MCU’s efficient switching regulators and sleep modes. Still, designers should ensure adequate copper pours beneath the thermal pad and avoid placing adjacent components directly above it to prevent localized heating and soldering defects.
Can the STM32L051K8U6 operate reliably in automotive environments with temperature cycling?
No, the STM32L051K8U6 is rated for industrial temperatures (-40°C to +85°C) but not full automotive AEC-Q100 qualification. While it may function in non-critical automotive subsystems, exposure to extended thermal cycling, humidity, or vibration could compromise solder joints and long-term reliability. For automotive-grade designs, STMicroelectronics recommends the STM32A series, which meets AEC-Q100 Grade 2 requirements and includes enhanced ESD protection and latch-up immunity.
What is the maximum achievable data throughput when using the STM32L051K8U6’s SPI peripheral in master mode?
The STM32L051K8U6’s SPI module supports clock speeds up to 16 MHz when using the internal 32MHz PLL. This yields theoretical data rates of up to 2 MBps (16 bits per transfer). In practice, actual throughput depends on bus arbitration, slave response time, and interrupt latency. With DMA enabled, sustained transfers to/from external memory or sensors can reach ~1.8 MBps. The limited RAM (8KB) means buffer sizes must be carefully managed to avoid overflow during continuous streaming operations.
Does the STM32L051K8U6 support secure firmware updates or cryptographic acceleration?
No, the STM32L051K8U6 does not include hardware cryptographic accelerators such as AES, SHA, or TRNG modules found in security-focused variants like the STM32L07x with TrustZone. Secure boot or encrypted firmware updates would need to be implemented in software, increasing code size and vulnerability to side-channel attacks. For applications requiring strong security, consider pairing the L051K8U6 with an external secure element or upgrading to a higher-performance MCU with integrated security features.
How does the STM32L051K8U6 manage power during deep-sleep modes with real-time clock (RTC) wake-up?
In STOP mode, the STM32L051K8U6 reduces core voltage and clocks while retaining backup registers, RTC, and some peripherals. Current consumption drops below 1 µA when VDD = 2.0V. The RTC can generate wake-up events every second or minute, depending on prescaler settings. Wake-up latency is typically 1–2 ms, allowing quick return to active operation. This makes it ideal for periodic logging or alarm functions in remote monitoring nodes where duty cycles are sparse.
What limitations exist when using the STM32L051K8U6’s ADC in simultaneous multi-channel sampling mode?
The STM32L051K8U6 features a single 12-bit SAR ADC shared across 10 channels. Simultaneous sampling requires external multiplexers since internal channel switching incurs settling delays (~1.5 µs per conversion). Maximum effective sampling rate per channel is approximately 50 kSPS, but true simultaneous acquisition demands careful sequencing and oversampling. Additionally, input impedance varies with channel selection, potentially affecting readings from high-impedance sensors unless buffering is provided externally.
How does the lack of dual-bank flash affect application development with the STM32L051K8U6?
Unlike some STM32L0 variants with dual-bank flash (allowing live firmware updates without interruption), the STM32L051K8U6 uses single-bank flash. This means all program memory shares one erase/write block, requiring full chip erasure before updating firmware. During development, this slows down iterative flashing cycles. Production DFU implementations must account for potential downtime during updates unless coupled with an external flash for delta patches or fallback images.
Can the STM32L051K8U6 be used in grid-tied solar inverters with MPPT algorithms?
Not recommended. While the MCU has PWM timers and analog inputs suitable for basic DC-DC converter control, solar inverters demand high-resolution ADCs (>16-bit), fast interrupt response, and precise timing synchronization—features absent in the L051K8U6. Moreover, safety standards (e.g., UL 1741) require certified isolation and fault detection not addressed by this MCU alone. Dedicated inverter control units with hardware dead-time insertion and fault-protected outputs are better suited for such applications.
What considerations apply when routing signals near the exposed pad of the STM32L051K8U6’s 32-UFQFPN package?
The exposed thermal pad on the underside of the STM32L051K8U6 acts as a ground reference and must be connected to a solid ground plane via multiple vias. Signal traces routed near this pad should maintain sufficient clearance to avoid capacitive coupling, especially for sensitive analog lines like ADC inputs. Avoid routing high-speed digital traces (e.g., SPI clock) directly over the pad area. Thermal relief patterns should be minimized to ensure proper solder wetting during reflow, particularly important given the MSL 3 classification requiring storage below 30°C/60% RH after opening.

Parts with Similar Specifications

The three parts on the right have similar specifications to STMicroelectronics STM32L051K8U6

Product Attribute STM32L051K8U6TR STM32L051K8U6DTR STM32L051K8U3 STM32L051K8U7
Part Number STM32L051K8U6TR STM32L051K8U6DTR STM32L051K8U3 STM32L051K8U7
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Core Processor - - - -
Program Memory Type - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Data Converters - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Core Size - - - -
Peripherals - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Oscillator Type - - - -
RAM Size - - - -
Program Memory Size - - - -
Connectivity - - - -
Speed - - - -
Number of I/O - - - -
EEPROM Size - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Series - - - -

STM32L051K8U6 Datasheet PDF

Download STM32L051K8U6 pdf datasheets and STMicroelectronics documentation for STM32L051K8U6 - STMicroelectronics.

PCN Design/Specification
Die redesign/Mask set Chg 23/Feb/2016.pdf MMS/15/9201 27/Apr/2015.pdf
PCN Packaging
Material Barrier Bag 17/Dec/2020.pdf
HTML Datasheet
STM32L0 Series Programming Manual.pdf STM32L051x6, x8 Datasheet.pdf
PCN Assembly/Origin
STM8/STM32 10/Mar/2020.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

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Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
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We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
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Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


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Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
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STM32L051K8U6 Image

STM32L051K8U6

STMicroelectronics
32D-STM32L051K8U6

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