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Home Products Integrated Circuits (ICs)Embedded - Microcontrollers~~STM32L051K8T6TR~~

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STM32L051K8T6TR - STMicroelectronics

Name: STMicroelectronics STM32L051K8T6TR
Brand: STMicroelectronics
SKU: STM32L051K8T6TR
Availability: InStock
Rating: 5 (10 reviews)

Manufacturer Part Number: STM32L051K8T6TR

Manufacturer: STMicroelectronics

Allelco Part Number: 32D-STM32L051K8T6TR

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 15,278 pcs available, New & Original

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

Package: 32-LQFP (7x7)

Data sheet: STM32L051K8T6TR.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: 15278

Specifications

STM32L051K8T6TR Tech Specifications
STMicroelectronics - STM32L051K8T6TR technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - STM32L051K8T6TR

Product Attribute	Attribute Value
Manufacturer	STMicroelectronics
Voltage - Supply (Vcc/Vdd)	1.65V ~ 3.6V
Supplier Device Package	32-LQFP (7x7)
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-LQFP
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

STM32L051K8T6TR (1)

Manufacturer Part Number

STM32L051K8T6TR

Manufacturer

stmicroelectronics

Introduction

The STM32L051K8T6TR from STMicroelectronics is a part of the STM32L0 series, designed as an ultra-low-power microcontroller for embedded applications, employing ARM® Cortex®-M0+ core technology.

Product Features and Performance

ARM® Cortex®-M0+ core with 32MHz speed

64KB Flash memory and 8KB RAM

Advanced connectivity: I2C, IrDA, SPI, UART/USART

Comprehensive peripheral set: DMA, PWM, WDT, and more

Integrated 10x12b A/D converters

Support for internal oscillators

Operable in a wide voltage range: 1.65V to 3.6V

Product Advantages

Excellent power efficiency, suitable for battery-powered devices

High-degree of code efficiency enabled by ARM Cortex-M0+

Flexibility in application due to generous memory size and diverse connectivity options

Robust peripheral set enhancing functional coverage

Key Technical Parameters

Core Processor: ARM® Cortex®-M0+, 32-Bit Single-Core

Speed: 32MHz

Connectivity: I2C, IrDA, SPI, UART/USART

Program Memory: 64KB FLASH

EEPROM Size: 2KB

RAM Size: 8KB

Number of I/O: 27

Voltage Supply: 1.65V ~ 3.6V

Operating Temperature: -40°C ~ 85°C

Quality and Safety Features

Includes Brown-out Detect/Reset for system reliability

Temperature range ensures operation in extreme conditions

Comprehensive safety and reliability features in its class

Compatibility

Compatible with various development environments and toolchains supporting the ARM Cortex-M0+ architecture.

Application Areas

Low-power IoT devices

Wearables

Home automation systems

Battery-operated applications

General embedded systems

Product Lifecycle

Active; not near discontinuation, with consistent support and availability of replacements or upgrades.

Several Key Reasons to Choose This Product

Low power consumption extends battery life in portable devices.

The high degree of integration reduces external component requirements, simplifying design and development.

Versatile connectivity options enable the device to fit a wide range of applications.

STMicroelectronics’ commitment to product longevity and support ensures a future-proof solution.

Advanced peripheral set supports complex applications without the need for additional components.

Frequently Asked Questions(FAQ)

How does the STM32L051K8T6TR's power consumption compare to other microcontrollers in its class, and what factors influence its efficiency in battery-operated applications?: The STM32L051K8T6TR features ultra-low-power architecture typical of the STM32L0 series, with active-mode current consumption around 37 µA/MHz at 3.0V and 24°C, which is significantly lower than general-purpose MCUs operating at similar clock speeds. In stop mode, it draws approximately 0.5 µA when using the internal low-speed oscillator, making it suitable for long-term battery life in IoT edge devices. Power efficiency is influenced by clock configuration, peripheral usage, and software optimization—especially leveraging the dynamic voltage scaling and multiple sleep modes (Sleep, Stop, Standby). Designers should minimize wake-up times and disable unused peripherals to maximize energy savings.

What are the key differences between the STM32L051K8T6TR and the STM32L052K8T6 in terms of memory resources and peripheral integration, and how might this affect system design choices?: While both parts share the same 32-LQFP package, core processor (Cortex-M0+), and speed (32MHz), the STM32L051K8T6TR has 64KB of Flash and 8KB of RAM, compared to the STM32L052K8T6’s 128KB Flash. Additionally, the L052 includes more advanced analog peripherals such as an additional ADC channel or enhanced DAC capabilities. For applications requiring larger firmware storage or complex signal processing, the L052 may be preferable; however, the L051K8T6TR offers sufficient resources for most sensor nodes and control tasks without over-provisioning, reducing cost and footprint.

Can the STM32L051K8T6TR reliably operate in industrial environments with temperature fluctuations between -20°C and +85°C, and what design precautions are necessary?: Yes, the STM32L051K8T6TR is rated for operation from -40°C to +85°C, fully encompassing the specified range. However, at the extremes, timing margins may tighten due to slower internal RC oscillators and reduced drive strength on I/O pins. To ensure reliability, designers should avoid aggressive clock speeds near the upper limit, implement proper decoupling capacitance, and validate communication protocols like UART or I2C under worst-case conditions. PCB layout must also maintain signal integrity, especially for high-impedance analog inputs tied to the integrated 12-bit ADC.

How many digital I/O lines can be simultaneously driven at full swing when using the STM32L051K8T6TR, and what limits output drive capability?: All 27 available GPIO pins on the STM32L051K8T6TR can be configured for digital input or output, but simultaneous maximum drive depends on total package current sourcing/sinking limits. The 32-LQFP (7x7) package typically allows up to 150 mA total across all pins, with individual pin current limited to ~20 mA. Therefore, while all pins can toggle rapidly, driving multiple LEDs or capacitive loads concurrently may require external buffering or level shifting to prevent voltage droop or excessive power draw that could destabilize the 1.65–3.6V supply rail.

What oscillator options are available on the STM32L051K8T6TR, and how do they impact boot time and system stability in real-time applications?: The STM32L051K8T6TR supports three primary clock sources: an internal 16 MHz RC oscillator (±1% accuracy at 25°C), a low-speed internal RC oscillator (~32 kHz), and an external crystal/resonator up to 32 MHz. Using the internal 16 MHz HSI reduces boot latency significantly compared to external crystals, which require several milliseconds to stabilize. For time-critical applications where jitter matters, the internal PLL derived from HSI may introduce minor phase noise; thus, external oscillators provide better precision but increase board complexity and cost. Most low-power designs leverage HSI for fast wake-up followed by switching to HSE only when higher accuracy is needed.

Is the STM32L051K8T6TR suitable for implementing secure firmware updates, and what hardware security features does it support?: The STM32L051K8T6TR includes basic security mechanisms such as Read Out Protection (RDP) levels and Write Protection for flash sectors, but lacks dedicated cryptographic accelerators found in higher-end STM32 families like G0 or G4 series. It does not have a true random number generator (RNG) or AES-256 hardware engine, so cryptographic operations must be implemented in software using libraries like mbed TLS, increasing code size and execution time. While adequate for simple authentication via shared keys or challenge-response protocols, it is not recommended for high-assurance applications requiring tamper resistance or end-to-end encryption without additional external security modules.

How does the 12-bit ADC inside the STM32L051K8T6TR perform when sampling multiple channels, and what sampling rate should be expected for real-world sensor readings?: The integrated 12-bit ADC on the STM32L051K8T6TR supports up to 10 channels with a maximum conversion rate of approximately 1 Msps in single-channel mode. However, when scanning multiple channels, the effective sample rate drops proportionally. For example, scanning five channels sequentially yields about 200 kSPS per channel. Each conversion takes around 1 µs, so with proper DMA-driven scanning, continuous monitoring of analog sensors like thermistors or pressure transducers is feasible. Accuracy degrades slightly beyond 25°C due to reference voltage drift, necessitating periodic calibration or use of the internal temperature sensor for compensation.

What is the impact of using the Cut Tape (CT) packaging variant of the STM32L051K8T6TR versus reel packaging on assembly line throughput and inventory management?: The STM32L051K8T6TR is available in both Cut Tape (CT) and Digi-Reel® formats, with CT suited for low-volume prototyping and small-batch manufacturing where reel feeding systems aren’t required. Reel packaging improves automation compatibility and reduces handling errors during high-speed SMT assembly. For production runs exceeding a few hundred units, reel format lowers per-unit cost through minimized tape waste and better feeder reliability. Both variants meet MSL 3 requirements and are RoHS3 compliant, ensuring consistent quality regardless of packaging choice.

How does the STM32L051K8T6TR handle brown-out detection and reset sequencing, and what thresholds are used during normal operation?: The STM32L051K8T6TR implements configurable brown-out reset (BOR) with four selectable voltage thresholds: BOR0 (1.7 V nominal), BOR1 (1.9 V), BOR2 (2.1 V), and BOR3 (2.4 V), allowing adaptation to different power rails and battery chemistries. During startup, the device performs a power-on reset (POR) followed by BOR check before releasing the reset line. This ensures stable initialization even if the supply ramps slowly. Developers can select the appropriate BOR level based on minimum operating voltage (1.65 V) to balance noise immunity against premature resets during transient dips.

Can the STM32L051K8T6TR interface directly with RS-485 transceivers, and what UART settings are recommended for reliable serial communication?: Yes, the STM32L051K8T6TR includes USART interfaces compatible with RS-485 transceivers via half-duplex enable/disable control. When using Modbus or similar protocols, configure oversampling by 16 (default), disable hardware flow control unless needed, and set parity to none for simplicity. Baud rates above 115200 bps may experience errors over long cables due to signal attenuation and skew, so testing with actual transceiver chips like SP3485EN is advised. Proper termination and ground referencing are critical for noise immunity in industrial networks.

What trade-offs exist between using internal vs. external flash programming methods for the STM32L051K8T6TR, and how does this affect development workflow?: The STM32L051K8T6TR supports in-system programming (ISP) via SWD or USART bootloader, enabling field updates without removing the MCU. Internal programming uses the built-in ROM bootloader, which requires precise timing and correct option byte configuration. Compared to external programmers, this method saves connectors and simplifies PCB layout but offers less diagnostic feedback. For production, external programmers provide faster write cycles and error checking, though they add cost and reduce flexibility. A balanced approach involves initial factory programming followed by OTA updates via secure bootloader if supported.

Does the STM32L051K8T6TR support dynamic reconfiguration of clock domains, and how does this affect peripheral timing accuracy?: The STM32L051K8T6TR allows dynamic switching between clock sources (HSI, HSE, MSI) and enables/disables PLL, but does not support fully independent clock domains for each peripheral. Peripherals like timers and ADCs derive clocks from the main system clock tree, so changing frequencies affects all timing-sensitive modules simultaneously. For instance, switching from 1 MHz to 32 MHz increases PWM resolution but may disrupt existing delays calibrated for the lower frequency. Designers must anticipate these effects and recalibrate timing-critical routines after any clock change.

What is the maximum allowable junction temperature for the STM32L051K8T6TR, and how does thermal management influence long-term reliability in compact enclosures?: Although the datasheet specifies an ambient operating range of -40°C to +85°C, the absolute maximum junction temperature is typically 150°C. In densely populated boards without airflow, self-heating from high CPU load combined with poor copper spread can push internal temperatures beyond safe limits even if the case remains below 85°C. To mitigate risk, limit duty cycle during sustained computations, use thermal vias under the LQFP pad, and consider derating performance in enclosed spaces. Monitoring the internal temperature sensor provides runtime feedback for adaptive throttling.

How does the STM32L051K8T6TR compare to ARM Cortex-M0 derivatives from other manufacturers in terms of wake-from-stop latency and energy-per-operation?: The STM32L051K8T6TR achieves sub-millisecond wake-up from Stop mode (~2 µs execution resume after ~3 µs wake sequence), competitive with other Cortex-M0 MCUs. Its 37 µA/MHz active current ranks among the lowest in class, outperforming many generic M0 parts that consume >50 µA/MHz. However, some Nordic or NXP variants offer even deeper sleep states or faster analog turn-on. The choice depends on application-specific constraints: if both deep sleep and fast ADC sampling matter, alternative devices may be preferable, but for most battery-powered sensors, the STM32L051K8T6TR strikes an excellent balance between performance and quiescent current.

Are there known errata or silicon limitations affecting the STM32L051K8T6TR that engineers should consider during schematic review?: Early revisions of STM32L051K8T6TR exhibited issues such as incorrect ADC offset in certain temperature ranges and occasional lockups during rapid clock transitions. These were addressed in later production batches referenced in ST’s Errata Sheet (e.g., doc ID DM00148070). Current samples typically follow revision 2 or later, which fixes most concerns. Always consult the latest errata before finalizing designs, especially if sourcing older inventory. Workarounds include adding software calibration loops for ADC and avoiding undocumented register writes during clock changes.

What is the recommended decoupling strategy for the STM32L051K8T6TR to ensure stable operation under transient loads from GPIO toggling or ADC conversions?: The STM32L051K8T6TR requires robust power supply filtering due to its sensitive analog circuitry. Use a combination of a 100 nF ceramic capacitor placed within 2 mm of each VDD/VSS pair and a 10 µF bulk tantalum or ceramic capacitor near the board’s power entry point. Place the 100 nF caps close to the IC’s power pins to suppress high-frequency noise from digital switching, while the larger cap handles slow voltage droops during ADC sampling. Avoid long traces and ensure solid ground plane stitching beneath the LQFP to maintain return path integrity.

Parts with Similar Specifications

The three parts on the right have similar specifications to STMicroelectronics STM32L051K8T6TR

Product Attribute
Part Number	STM32L051K6T6TR	STM32L051C8T6TR	STM32L051K8U6TR	STM32L051K8U6DTR
Manufacturer	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Core Size	-	-	-	-
RAM Size	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Core Processor	-	-	-	-
Connectivity	-	-	-	-
Data Converters	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Peripherals	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Number of I/O	-	-	-	-
EEPROM Size	-	-	-	-
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Voltage - Supply (Vcc/Vdd)	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Program Memory Type	-	-	-	-
Series	-	-	-	-
Speed	-	-	-	-
Oscillator Type	-	-	-	-
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Program Memory Size	-	-	-	-

STM32L051K8T6TR Datasheet PDF

Download STM32L051K8T6TR pdf datasheets and STMicroelectronics documentation for STM32L051K8T6TR - 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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