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Home Products Integrated Circuits (ICs)Embedded - Microcontrollers~~STM32L051K8U6TR~~

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STM32L051K8U6TR - STMicroelectronics

Name: STMicroelectronics STM32L051K8U6TR
Brand: STMicroelectronics
SKU: STM32L051K8U6TR
Price: 0.587 USD
Availability: InStock
Rating: 5 (6 reviews)

Manufacturer Part Number: STM32L051K8U6TR

Manufacturer: STMicroelectronics

Allelco Part Number: 32D-STM32L051K8U6TR

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 14,952 pcs available, New & Original

Parts Description: IC MCU 32BIT 64KB FLASH 32UFQFPN

Package: 32-UFQFPN (5x5)

Data sheet: STM32L051K8U6TR.pdf

PCN Design/Specification
Datasheet Chg 07/Mar/2016.pdf Die redesign/Mask set Chg 23/Feb/2016.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

RoHs Status: ROHS3 Compliant

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In stock: 14952

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Quantity	Unit Price	Ext. Price
1+	$0.984	$0.98
10+	$0.846	$8.46
30+	$0.758	$22.74
100+	$0.644	$64.40
500+	$0.604	$302.00
1000+	$0.587	$587.00

The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

STM32L051K8U6TR Tech Specifications
STMicroelectronics - STM32L051K8U6TR technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - STM32L051K8U6TR

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	Tape & Reel (TR)

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

STM32L051K8U6TR (1)

Manufacturer Part Number

STM32L051K8U6TR

Manufacturer

STMicroelectronics

Introduction

Embedded Microcontroller from STM32L0 Series

Product Features and Performance

ARM Cortex-M0+ Core Processor

32-Bit Single-Core Architecture

32MHz Operating Frequency

64KB Flash Program Memory

8KB RAM

2KB EEPROM

27 I/O Ports

10-channel 12-bit A/D Converters

Internal Oscillator

Product Advantages

Low Power Consumption

Enhanced Performance in M0+ Segment

Compact 32-UFQFPN (5x5) Package

Integrated Peripherals Reducing BOM Cost

Key Technical Parameters

Speed: 32MHz

Program Memory Size: 64KB

EEPROM Size: 2KB

RAM Size: 8KB

Voltage Supply Range: 1.65V to 3.6V

Operating Temperature Range: -40°C to 85°C

Quality and Safety Features

Brown-out Detect/Reset

DMA Support for Data Management

POR and WDT for System Security

Compatibility

I2C, IrDA, SPI, UART/USART Interfaces

Surface Mount Compatible with 32-UFQFN Exposed Pad

Application Areas

Low Power Applications

Battery-operated Devices

Industrial Control Systems

Healthcare and Medical Electronics

Product Lifecycle

Active Product Status

Not Nearing Discontinuation

Future Replacements or Upgrades Currently Unspecified

Several Key Reasons to Choose This Product

Efficiency in Power-sensitive Applications

Ideal for Small-scale Devices due to Compact Size

Multiple Connectivity Options for Versatile Use

Reliable for Harsh Environments with Wide Temperature Range

Feature-rich MCU for Complex Tasks in Embedded Systems

Frequently Asked Questions(FAQ)

How does the STM32L051K8U6TR compare to other STM32L0 series microcontrollers in terms of power consumption and memory configuration for battery-powered IoT applications?: The STM32L051K8U6TR offers a balanced combination of low-power operation and compact memory footprint, making it suitable for energy-constrained embedded systems. With 64KB of Flash and 8KB of RAM, it provides sufficient program storage and data handling for sensor nodes and wireless connectivity modules. Its ARM Cortex-M0+ core operates at up to 32MHz while maintaining typical active-mode current consumption below 100µA/MHz, which is competitive within the STM32L0 family. When compared to higher-memory variants like the STM32L071 or lower-end models such as the STM32L051x6, this part strikes a practical middle ground between functionality and power efficiency. The integrated peripherals—including multiple USARTs, SPI, I2C, and a 12-bit ADC with 10 channels—reduce the need for external components, further minimizing system-level power draw.

What are the key design considerations when using the STM32L051K8U6TR in a low-voltage battery application where supply voltage may drop below 2.0V during discharge?: Operating near the minimum supply voltage of 1.65V requires careful attention to timing margins, analog performance, and reset behavior. The STM32L051K8U6TR includes a brown-out reset (BOR) feature that can be configured to trigger at different thresholds, but users must ensure their firmware accommodates potential clock drift due to reduced VDD. At voltages approaching 1.7V, the internal RC oscillator may exhibit frequency variation, impacting communication protocols like UART or I2C. Additionally, the ADC accuracy degrades slightly at lower voltages; for precision measurements, an external reference or calibration routine should be implemented. Power-saving modes such as STOP or STANDBY can extend battery life, but wake-up latency increases as voltage decreases. Proper decoupling and layout practices are essential to maintain stability under transient load conditions.

Can the STM32L051K8U6TR reliably support real-time data logging from multiple sensors using its available I/O pins and DMA capabilities?: Yes, the STM32L051K8U6TR is well-suited for real-time sensor data acquisition thanks to its 27 general-purpose I/O pins, flexible timer configurations, and dedicated DMA controller. The presence of multiple USART and SPI interfaces allows concurrent communication with various peripherals without CPU intervention. By leveraging the DMA to transfer ADC samples directly to RAM, the CPU remains free to process or transmit data, reducing interrupt overhead. However, developers must manage buffer sizes carefully—given only 8KB of RAM, large datasets require efficient compression or streaming techniques. Timers can generate PWM signals for actuator control while simultaneously capturing input pulses, enabling complex multi-tasking scenarios. The lack of an Ethernet MAC means wired networking isn't supported, but CAN or USB (not present on this variant) would be needed for those use cases instead.

How does the package size and pinout of the STM32L051K8U6TR influence PCB layout decisions in space-constrained wearable devices?: The 32-UFQFPN (5x5 mm) package offers a compact footprint ideal for miniaturized designs, but its small pitch (~0.4mm ball spacing) demands high-precision assembly and careful thermal management during soldering. All critical power and ground connections should be routed close to the device, with multiple vias to adjacent layers to reduce inductance and noise. The exposed pad enhances heat dissipation but must not create unintended electrical paths unless properly insulated. Signal integrity becomes more challenging at 32MHz due to trace length mismatches, so differential pairs and matched routing lengths should be considered for high-speed buses like SPI. Given the limited number of I/Os (27), pin multiplexing strategies are necessary to maximize functionality—for example, reusing UART pins via alternate functions based on application needs.

What trade-offs exist between using the internal oscillator versus an external crystal with the STM32L051K8U6TR, especially in time-critical applications?: The STM32L051K8U6TR integrates a calibrated internal RC oscillator running at 32kHz and 1MHz, which eliminates the need for external crystals and saves board space. This is advantageous for cost-sensitive or compact designs where timing accuracy is less critical. However, the internal oscillator typically has ±2–5% tolerance and drifts with temperature and voltage variations, potentially causing issues in precise timing scenarios like RTC synchronization or baud rate generation over long cables. In contrast, adding a 32.768kHz crystal improves RTC accuracy to ±20ppm or better and reduces power consumption in low-frequency operations. For applications requiring deterministic timing—such as motor control or protocol handshakes—an external crystal paired with the main HSE (High-Speed External) oscillator provides superior stability, albeit at increased component count and cost.

Is the STM32L051K8U6TR suitable for industrial environments where operating temperatures reach up to 85°C, and what precautions should be taken?: Yes, the STM32L051K8U6TR is rated for commercial temperature range (-40°C to +85°C), making it viable for many industrial edge devices. At elevated temperatures, however, leakage currents increase slightly and flash programming endurance decreases over time. Users should avoid frequent erase/write cycles if long-term reliability is a concern. Thermal derating isn't required for basic operation, but sustained high ambient temperatures may necessitate airflow or heatsinking if the MCU drives high-current loads through GPIOs. Additionally, the internal regulators and oscillators may behave differently near the upper end of the range—calibration routines or software compensation might be needed for consistent performance. Moisture sensitivity level (MSL 3) indicates standard handling procedures apply, but conformal coating can protect against condensation in humid settings.

How does the EEPROM emulation capability of the STM32L051K8U6TR impact system longevity compared to using external EEPROM chips?: The STM32L051K8U6TR emulates 2KB of EEPROM within its 64KB Flash array, offering non-volatile storage without additional components. While convenient for storing configuration parameters or calibration offsets, Flash endurance is significantly lower than true EEPROM—typically around 10k write cycles versus 1M+ for dedicated chips. For infrequent updates (<100 writes/day), this limitation is rarely problematic. However, continuous logging or frequent parameter changes could degrade the Flash prematurely. External EEPROMs like the 24LCxx series offer higher endurance and faster write speeds, though they consume extra pins and increase BOM cost. Developers must implement wear-leveling algorithms if relying on internal Flash for EEPROM-like usage to distribute writes evenly across sectors and extend usable lifespan.

What debugging and development tools are recommended for working with the STM32L051K8U6TR, considering its Cortex-M0+ architecture?: The STM32L051K8U6TR benefits from full support by STMicroelectronics’ ecosystem, including STM32CubeIDE, which provides project templates, HAL drivers, and middleware for RTOS integration. The ST-Link debugger/VCP interface (via SWD) enables single-wire debugging and programming, compatible with most development boards featuring this interface. Third-party tools like Keil µVision or SEGGER Embedded Studio also support the Cortex-M0+, though optimization features may vary. Given the limited RAM (8KB), debugging large arrays or deep call stacks may strain resources; logging should be minimized in production builds. For rapid prototyping, Nucleo-L053R8 or Discovery-L073Z-E boards provide plug-and-play evaluation with built-in ST-Link and expansion headers matching the UFQFPN footprint.

Parts with Similar Specifications

The three parts on the right have similar specifications to STMicroelectronics STM32L051K8U6TR

Product Attribute
Part Number	STM32L051K8U6DTR	STM32L051K8T6TR	STM32L051K8U3TR	STM32L051K6U6TR
Manufacturer	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Peripherals	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Core Size	-	-	-	-
Core Processor	-	-	-	-
Oscillator Type	-	-	-	-
Series	-	-	-	-
Speed	-	-	-	-
RAM Size	-	-	-	-
EEPROM Size	-	-	-	-
Program Memory Type	-	-	-	-
Data Converters	-	-	-	-
Number of I/O	-	-	-	-
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Connectivity	-	-	-	-
Program Memory Size	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Voltage - Supply (Vcc/Vdd)	-	-	-	-

STM32L051K8U6TR Datasheet PDF

Download STM32L051K8U6TR pdf datasheets and STMicroelectronics documentation for STM32L051K8U6TR - STMicroelectronics.

PCN Design/Specification: Datasheet Chg 07/Mar/2016.pdf Die redesign/Mask set Chg 23/Feb/2016.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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Common Countries Logistic Time Reference
Region	Country	Logistic Time(Day)
America	United States	5
America	Brazil	7
Europe	Germany	5
	United Kingdom	4
	Italy	5
Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
Asia	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.
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