STM32L071K8U3 - 32MHz, 64KB Ultra-Low-Power MCU | ST
MPN: STM32L071K8U3 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.5373 | $1.54 |
| 10 | $1.5373 | $15.37 |
| 100 | $1.5373 | $153.73 |
| 500 | $1.5373 | $768.65 |
| 1,000 | $1.5373 | $1,537.30 |
STM32L071K8U3 Overview
What is an ultra-low-power microcontroller? An ultra-low-power MCU is a semiconductor controller optimized to complete sensing, control, and communications tasks while consuming little active and sleep energy. The STM32L0 access line belongs to the STM32 family of 32-bit Arm Cortex-M microcontrollers and combines a low-power CPU with timers, communication peripherals, analog conversion, and GPIO in one package. This integration reduces board area, component count, and system power compared with a discrete control design.
Verified source data identifies an Arm Cortex-M0+ core, 32 MHz maximum operating frequency, 64 KB organized as 64K x 8 Flash, and a 32-UFQFPN 5 x 5 mm package. The Mouser listing further identifies the device as an ultra-low-power Arm Cortex-M0+ MCU with 64 KB of Flash and a 32 MHz CPU. Additional RAM size, supply-voltage range, ADC characteristics, timer resources, GPIO count, and package tolerances are not present in the supplied source excerpts and therefore require confirmation from the manufacturer documentation.
The STM32L0 architecture is suitable for energy-sensitive control systems because software can place the processor into low-power operating states between events. Low-power execution is particularly useful for portable sensors, where the MCU may wake to read an analog value, update an output, exchange data, and return to sleep. The 64 KB Flash capacity also accommodates embedded firmware, boot logic, configuration data, and application code in a compact 32-pin package.
Typical uses for this microcontroller include connected environmental sensors, compact industrial monitors, battery-powered data loggers, appliance controllers, low-power wireless sensor nodes, and wearable accessories. Selection should prioritize verified peripheral compatibility, pin-level requirements, firmware portability, and power-mode support rather than core frequency alone. A firmware migration between STM32 families is simpler when peripheral behavior and software abstractions remain consistent, but a new design still requires board-level review.
PCB implementation should preserve clean grounding and short analog paths around MCU power and sensing pins. Decoupling capacitors should be placed close to the associated supply pins, while exposed-pad or thermal requirements must follow the exact land pattern in the official package drawing. Firmware should use the correct startup vector table, clock initialization, and low-power mode transitions; excessive polling can negate the benefit of a sleep-capable MCU.
This page combines verified distributor and manufacturer listings, commercial availability links, procurement context, and package-specific design guidance. It does not infer undocumented electrical values, and it distinguishes confirmed STM32L071K8U3 facts from parameters that still require verification in the official datasheet.
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Request AlternativesSTM32L071K8U3 Maximum Ratings & Electrical Characteristics
| Product Type | Ultra-low-power 32-bit microcontroller |
| CPU Core | Arm Cortex-M0+ |
| Architecture | 32-bit RISC |
| Maximum CPU Frequency | 32 MHz |
| Flash Memory | 64 KB (64K x 8) |
| Program Memory Type | Flash |
| Package | 32-UFQFPN (5 mm x 5 mm) |
| Mounting Type | Surface Mount |
| Low-Power Features | Ultra-low-power MCU |
STM32L071K8U3 32-ufqfpn (5 mm x 5 mm) Pin Configuration Guide
Pin configuration for STM32L071K8U3 (32-ufqfpn (5 mm x 5 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for STM32L071K8U3.
Refer to the datasheet for full pin configuration.
Typical Applications
STM32L071K8U3 is suitable for 6 applications: Battery-Powered Environmental Sensor, Compact Industrial Data Logger, Low-Power Wireless Sensor Node, Battery-Powered Home Appliance Controller, Portable Medical Accessory Controller, IoT Device and Sensor Interface.
Battery-Powered Environmental Sensor
The STM32L071K8U3 fits compact environmental sensors that periodically digitize an analog signal, apply filtering, update a status indicator, and transmit a measurement before returning to a low-power state. Its confirmed 32 MHz Arm Cortex-M0+ core provides a modern 32-bit control platform, while 64 KB of Flash accommodates acquisition logic, calibration tables, communications, and device management. The 32-pin 5 mm by 5 mm UFQFPN package also helps reduce board area. Before release, confirm the ADC resolution, sampling time, sensor interface pins, supply range, and sleep current from the manufacturer datasheet; these values are not present in the supplied excerpts. Battery-life claims should be calculated from measured active and sleep current rather than the low-power product description alone.
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Compact Industrial Data Logger
The STM32L071K8U3 is appropriate for a small industrial data logger that records sensor readings, timestamps events, maintains local parameters, and wakes periodically for a burst of processing. The verified 64 KB Flash capacity provides a defined firmware budget, and the Arm Cortex-M0+ core can support compact control logic in a 32-UFQFNN package. A production design should use the official memory map to partition firmware and data, then confirm the exact RAM capacity and endurance requirements before selecting a logging strategy. For factory or field deployments, add watchdog and recovery behavior appropriate to the system, validate brownout behavior, and use the manufacturer's ESD and industrial-temperature requirements. Those qualification details are not included in the supplied data and must not be inferred.
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Low-Power Wireless Sensor Node
The STM32L071K8U3 can serve as the low-power controller in a wireless sensor node when the radio is handled as a wake-on-demand peripheral and the MCU remains mostly asleep. Its verified 32 MHz Cortex-M0+ performance and 64 KB Flash suit compact protocol handling, local filtering, and configurable sensing logic, while the small package leaves limited board area for the radio and antenna. The radio interface, supply rail, peak-current behavior, and deep-sleep budget remain unverified in the supplied excerpts. Engineering validation should therefore include radio burst-current testing, antenna coexistence checks, wake-latency measurement, and firmware review for race conditions between external interrupts and low-power entry.
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Battery-Powered Home Appliance Controller
The STM32L071K8U3 is suitable for low-energy appliance controls that manage buttons, indicators, simple sensors, and a small state machine. The Arm Cortex-M0+ core provides 32-bit processing, the verified 64 KB Flash supports a complete embedded application, and the compact 5 mm by 5 mm package can fit beneath a display or inside a sealed enclosure. Designers must confirm the package's exposed-pad treatment, pin multiplexing, maximum GPIO current, and analog limits against the exact package documentation. For reliable products, define failsafe states for power loss and firmware lockup, test brownout recovery, and isolate noisy motor or relay loads from sensitive routing. These values are application-specific and are not present in the supplied search results.
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Portable Medical Accessory Controller
The STM32L071K8U3 may suit a low-power portable medical accessory when its verified CPU and memory are sufficient and the complete electrical and regulatory requirements are independently met. The 32-bit Cortex-M0+ core can coordinate controls, noncritical sensing, status feedback, and a host interface, while the 32-pin package supports a compact PCB. The supplied excerpts do not establish medical certification, ADC accuracy, safety inputs, leakage behavior, operating-temperature limits, or supply range. Therefore, this MCU should not be treated as medically qualified based on this page. A medical design must complete hazard analysis, component qualification, verification of relevant electrical limits, software-risk controls, and validation under the intended use conditions.
Recommended
IoT Device and Sensor Interface
The STM32L071K8U3 can function as the local control and sensor-interface device in a compact IoT product where it preprocesses measurements and coordinates a communications module. Its 32 MHz Cortex-M0+ core is suitable for interrupt handling and lightweight protocols, and its verified 64 KB Flash budget supports application firmware in a constrained enclosure. Designers should confirm whether the required UART, SPI, I2C, ADC, timers, and GPIO functions are available on the exact 32 pins; none of those detailed peripheral values appears in the supplied snippets. Prototype testing should include signal-integrity checks on external buses, brownout behavior during network activity, firmware update recovery, and a power budget that includes all radio and sensor loads.
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Engineering reference data for STM32L071K8U3 — comparison, design guidance, and compliance information.
Selection Guide
Design Notes
Treat the STM32L071K8U3 as part of a complete low-power power budget rather than an isolated low-power specification. Confirm supply limits and operating currents from the official STM32L071K8 documentation, measure the assembled board in each relevant mode, and include sensor, interface, regulator, and pull-up loads. Wake every peripheral only when required and prevent peripherals or GPIO pins from forcing excess leakage during sleep.
Use the official 32-UFQFNN land pattern and pin definitions for layout. Keep required bypass capacitors immediately beside the associated supply pins, provide a low-impedance ground return, and follow the package drawing for exposed-pad connection. Because the supplied excerpts identify only the 5 mm by 5 mm package and do not show the pad geometry, courtyard, or thermal pad details, do not construct a footprint from generic QFN artwork.
Do not treat equal package size or Cortex-M core family as proof of replaceability. A valid MCU substitution must match the exact pin functions, alternate-function mappings, power pins, reset behavior, clock requirements, peripheral set, memory map, bootloader expectations, and lifecycle status. For software, initialize only after the clock tree and supply are stable, and verify low-power entry against every active peripheral interrupt or DMA request.
Compliance Information
No exact-MPN environmental or automotive qualification declarations were included in the supplied verified data.
