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Home Products Integrated Circuits (ICs)Specialized ICs~~STM32L051K8U7TR~~

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STM32L051K8U7TR - STMicroelectronics

Name: STMicroelectronics STM32L051K8U7TR
Brand: STMicroelectronics
SKU: STM32L051K8U7TR
Price: 3.021 USD
Availability: InStock
Rating: 5 (1 reviews)

Manufacturer Part Number: STM32L051K8U7TR

Manufacturer: STMicroelectronics

Allelco Part Number: 41D-STM32L051K8U7TR

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 6,420 pcs available, New & Original

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Category: Integrated Circuits (ICs) > Specialized ICs

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Specifications

STM32L051K8U7TR Tech Specifications
STMicroelectronics - STM32L051K8U7TR technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - STM32L051K8U7TR

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Parts Introduction

STM32L051K8U7TR (1)

Manufacturer Part Number

STM32L051K8U7TR

Manufacturer

stmicroelectronics

Introduction

The STM32L051K8U7TR is a high-performance, low-power 32-bit microcontroller based on the ARM Cortex-M0+ core. It offers a wide range of peripherals and is designed for low-power applications, making it suitable for a variety of embedded systems and IoT devices.

Product Features and Performance

ARM Cortex-M0+ 32-bit core running at up to 32 MHz

64 KB of Flash memory and 8 KB of RAM

Extensive peripheral set including I2C, IrDA, SPI, and UART/USART

Integrated features like Brown-out Detect/Reset, DMA, POR, PWM, and WDT

27 I/O pins for flexible system integration

10-bit, 12-channel ADC for sensor data acquisition

Internal oscillator for reduced external component count

Product Advantages

Low-power operation for extended battery life in portable devices

Extensive peripheral set for diverse application requirements

Scalable performance and memory options within the STM32L0 series

Easy integration and development with the STM32 ecosystem

Key Reasons to Choose This Product

Optimized power consumption for battery-powered and energy-harvesting applications

Comprehensive peripheral set to support a wide range of embedded systems

Flexible and scalable platform within the STM32 family

Proven reliability and long-term availability from a trusted semiconductor manufacturer

Quality and Safety Features

Extended operating temperature range of -40°C to 105°C

Robust surface mount package (32-UFQFPN) for reliable operation

Comprehensive system-level protection features

Compatibility

The STM32L051K8U7TR is compatible with the STM32L0 series and can be readily integrated into existing STM32-based designs.

Application Areas

Wearable devices

Industrial automation and control systems

Home automation and smart home applications

Wireless sensor networks and IoT devices

Medical equipment and healthcare applications

Product Lifecycle

The STM32L051K8U7TR is an active product in the STM32L0 series. Equivalent or alternative models within the STM32L0 family include the STM32L052, STM32L053, and STM32L062 series. For the latest information on product availability and lifecycle status, please contact our website's sales team or visit our website's sales team.

Frequently Asked Questions(FAQ)

What are the key power consumption characteristics of the STM32L051K8U7TR during active and sleep modes, and how do they influence low-power system design?: The STM32L051K8U7TR features ultra-low power consumption typical for the STM32L0 series, with active mode current draw around 1.0 mA/MHz at 32 MHz using the internal high-speed clock, and deep sleep mode current as low as 1.4 µA when retaining RAM and registers. This enables battery-powered applications to achieve multi-year operational lifespans. Designers must consider voltage scaling (down to 1.65 V), peripheral usage during wake-up sequences, and clock source selection to optimize between performance and energy efficiency.

How does the STM32L051K8U7TR compare to other STM32L0 variants in terms of memory architecture and peripheral integration for constrained embedded systems?: Compared to the STM32L051K6U6 (32 KB flash) and STM32L051K8U7TR (64 KB flash), the K8 variant offers double the program memory while maintaining identical core, speed, and package form factor. It includes the same 2 KB EEPROM and 8 KB RAM, but with higher code density support. Both share peripherals like USART, SPI, I2C, and 10-bit ADC, but the larger flash allows implementation of more complex firmware without external memory. This makes the STM32L051K8U7TR suitable for advanced sensor fusion or protocol stacks requiring additional logic.

Can the STM32L051K8U7TR reliably operate in industrial temperature ranges, and what design considerations are necessary for stable operation at -40°C and +105°C?: Yes, the STM32L051K8U7TR is qualified over a wide industrial temperature range of -40°C to +105°C. However, at elevated temperatures, leakage currents increase slightly, and internal oscillator accuracy may drift beyond ±1%. For precision timing applications, an external crystal should be used instead of the internal RC oscillator. Additionally, ensure proper PCB layout to minimize thermal gradients and avoid solder joint fatigue due to coefficient mismatch between silicon and laminate materials.

What is the maximum number of simultaneous communications protocols that can be fully utilized on the STM32L051K8U7TR, and how does pin allocation affect real-world connectivity?: The STM32L051K8U7TR supports up to four full-duplex communication interfaces: one USART, two SPI, and one I2C, plus IrDA modulation. With 27 GPIOs available, careful pin mapping is required since certain peripherals share alternate function pins. For example, USART1 uses PA9/PA10, which may conflict with ADC input channels. In high-density designs, using DMA-assisted transfers reduces CPU overhead and enables near-continuous data flow across multiple interfaces without contention.

How much program and data memory does the STM32L051K8U7TR provide, and what are practical implications for firmware development and debugging?: The STM32L051K8U7TR contains 64 KB of embedded Flash memory for program storage and 8 KB of SRAM for runtime data. With 2 KB of electrically erasable programmable EEPROM, non-volatile configuration data can be stored securely. At 32 MHz, the Cortex-M0+ core achieves approximately 1 cycle per instruction on average, allowing efficient execution of event-driven logic. Developers should reserve at least 1–2 KB of Flash for bootloader space and use linker scripts to optimize memory usage, especially when implementing RTOS-based applications.

What voltage supply range and brown-out detection thresholds does the STM32L051K8U7TR support, and how does this impact system reliability in variable power environments?: The STM32L051K8U7TR operates from 1.65 V to 3.6 V, enabling compatibility with both single-cell Li-ion batteries and 3.3 V logic systems. It incorporates programmable brown-out reset (BOR) levels—typically at 2.0 V or 2.4 V depending on software configuration—that prevent erratic behavior during undervoltage conditions. During brown-out events, the device resets automatically, preserving system integrity. Designers can adjust BOR settings via STMCubeMX or HAL libraries to balance power savings against robustness in noisy or intermittent power scenarios.

Does the STM32L051K8U7TR include built-in security features, and what protections exist against unauthorized access or tampering?: While the STM32L051K8U7TR lacks hardware cryptographic engines found in higher-end STM32 families, it supports basic protection mechanisms such as read-out protection (RDP) level 0 and 1, which prevent code extraction from Flash. Level 1 disables mass erase unless a specific sequence is executed. Additionally, the unique device identifier (UID) provides hardware fingerprinting. For secure applications, developers often implement software-based AES encryption using the ARM Cryptolib or leverage external secure elements, though this increases code footprint within the 64 KB limit.

What packaging options are available for the STM32L051K8U7TR, and how does the UFQFPN (5x5 mm) format benefit high-volume manufacturing?: The STM32L051K8U7TR is available in a 32-pin UFQFPN (Ultra Fine Pitch Quad Flat No-leads) package measuring 5x5 mm with an exposed thermal pad. This compact size enables high component density on PCBs, ideal for space-constrained IoT nodes or wearables. The no-lead design improves solder joint reliability under vibration and thermal cycling compared to traditional QFPs. The package is compatible with standard pick-and-place assembly lines and qualifies for Tape & Reel (TR) shipping, facilitating automated SMT production with MSL 3 compliance (168-hour floor life).

How does the integrated watchdog timer and power-on-reset circuit enhance system resilience in unattended embedded deployments?: The STM32L051K8U7TR includes both an independent watchdog (IWDG) and windowed watchdog (WWDG), along with a precise power-on-reset (POR) circuit. The IWDG runs off an internal low-power RC oscillator, remaining functional even if the main clock fails, making it ideal for monitoring software hangs. Combined with POR that triggers on any voltage dip below safe thresholds, these features ensure robust recovery from transient faults. In battery-operated devices, periodic IWDG refresh calls become critical maintenance routines within interrupt service routines.

Can the STM32L051K8U7TR drive multiple LEDs or motors directly, or does it require external drivers, and what current sourcing limitations apply?: Each GPIO on the STM32L051K8U7TR sources/sinks up to 25 mA, sufficient for driving small LEDs or relay coils directly. However, cumulative I/O current must not exceed 125 mA across all pins, with a total package limit of 200 mA. For inductive loads like motors, flyback diodes are essential to protect against back EMF. In cases where higher current is needed, external MOSFETs or driver ICs should be added. PWM outputs from the timer peripherals enable efficient control of LED brightness or motor speed without significant CPU overhead.

What ADC specifications define the performance of the STM32L051K8U7TR’s analog front end, and how accurate are its measurements in real-world sensing applications?: The STM32L051K8U7TR integrates a 10-bit successive approximation ADC with 12 conversion channels and a sampling rate up to 1 Msps. Its effective resolution depends on reference voltage stability; using the internal 1.2 V bandgap reference yields ~±2 LSB integral nonlinearity. For temperature sensors or voltage monitoring, this provides adequate precision (±4.8 mV at 3.3 V). External buffered references improve linearity further. When sampling slowly (<10 kSPS), oversampling by 16× effectively increases resolution to 12 bits, useful for low-noise signal acquisition in environmental monitoring systems.

Is the STM32L051K8U7TR suitable for wireless sensor node applications, and what external components would complement its capabilities?: Yes, the STM32L051K8U7TR is well-suited for wireless sensor nodes due to its ultra-low quiescent current (as low as 1.4 µA in standby), 64 KB Flash for protocol stacks, and support for UART/I2C/SPI interfaces. It can interface with LoRa transceivers, BLE modules (via UART), or NFC tags. External components typically include an antenna matching network, decoupling capacitors near VDD pins, and optional crystal oscillators for timing-critical communications. Power management ICs with buck-boost converters help maintain efficiency across varying battery voltages down to 1.65 V.

How does the DMA capability of the STM32L051K8U7TR improve data throughput in multitasking environments?: The STM32L051K8U7TR includes a DMA controller with seven channels capable of offloading data movement from the CPU during ADC conversions, UART transmissions, or SPI transfers. For instance, continuous ADC sampling at 100 ksps can be directed to RAM buffers without interrupting the main loop, reducing jitter in time-sensitive tasks. This is particularly valuable in motor control or data logging scenarios where bursty I/O dominates processing load. Proper channel prioritization ensures real-time responsiveness even under heavy peripheral traffic.

What are the recommended decoupling practices when using the STM32L051K8U7TR in high-frequency switching circuits?: To ensure stable operation, place 100 nF ceramic capacitors as close as possible to each VDD/VSS pair, including dedicated pairs for analog supplies if available. A bulk 10 µF tantalum or ceramic capacitor at the board edge supports transient loads during rapid state changes. Avoid shared return paths between digital and analog grounds; instead, use star grounding near the MCU. These measures mitigate noise coupling into sensitive ADC inputs and prevent glitches from affecting internal regulators or oscillators.

How does the STM32L051K8U7TR compare to newer STM32G0 or STM32WL series in terms of power efficiency and feature set for future-proofing designs?: While the STM32L051K8U7TR remains highly efficient for its class, the STM32G0 series offers higher performance (64 MHz), FPU support, and enhanced security, whereas the STM32WL adds integrated sub-GHz RF transceiver functionality. However, the STM32L051K8U7TR retains advantages in ultra-low idle power and proven ecosystem maturity. For simple sensor nodes without wireless needs, it delivers superior energy-per-operation efficiency. Migration paths exist via similar pinouts and toolchains, but adding RF eliminates need for external modules, increasing reliability.

Are there known errata or silicon limitations for the STM32L051K8U7TR that could impact long-term deployment reliability?: As with all microcontrollers, the STM32L051K8U7TR has documented errata in STMicroelectronics’ official reference manual (e.g., Rev. 11). Common issues include occasional ADC offset errors under extreme temperatures, rare I2C bus lockups after repeated start conditions, and minor USB-related anomalies (though USB is not present on this model). Most are mitigated through firmware workarounds like calibration routines or timeout handling. Always consult the latest datasheet and errata notes before finalizing hardware revisions.

What development tools and software libraries are optimized for the STM32L051K8U7TR, and how do they accelerate prototyping?: STMicroelectronics provides STM32CubeMX for graphical initialization, HAL/LL drivers for abstraction, and STM32CubeIDE for C/C++ development with debugging support. Third-party tools like Keil MDK and IAR Embedded Workbench also offer full compilation and trace capabilities. Pre-tested middleware packages simplify implementation of FatFS, TCP/IP stacks, or touch sensing. These ecosystems reduce setup time and ensure adherence to best practices, accelerating time-to-market for complex applications leveraging the STM32L051K8U7TR’s capabilities.

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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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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

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