STMicroelectronics STM32L071KBU6

Overview

STM32L071KBU6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 128 KB Flash, 20 KB SRAM, and 6 KB EEPROM; operates from 1.65–3.6 V across –40 to +125 °C; delivers 93 µA/MHz in Run mode and 0.29 µA in Standby mode with RTC active; used in battery-powered IoT sensors and portable medical monitors.

For engineers reviewing the STM32L071KBU6 datasheet, STM32L071KBU6 pinout, STM32L071KBU6 application, or STM32L071KBU6 equivalent, key selection criteria include ultra-low-power sleep current, integrated 12-bit ADC (1.14 Msps), dual ultra-low-power comparators with wake-up capability, and support for ISO 7816/IRDA via USART peripherals.

Technical Context

The STM32L071KBU6 implements a Cortex-M0+ core with Memory Protection Unit (MPU), running at up to 32 MHz with 0.95 DMIPS/MHz performance; it supports dynamic voltage scaling and multiple low-power modes including Stop mode with 0.43 µA consumption and RTC retention.

Its analog subsystem integrates a 12-bit ADC with up to 16 channels, two independent ultra-low-power comparators (operable down to 1.65 V), and internal voltage reference (VREFINT); clocking includes HSI16 (±1%), LSE (32.768 kHz), and PLL for CPU frequency synthesis.

Key Specifications

Pinout & Package

STM32L071KBU6 uses the UFQFPN32 (5 × 5 mm) package with 32-pin layout and 0.5 mm pitch; all I/Os are 5V-tolerant except BOOT0 and NRST.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L072KBU6, this part omits hardware crypto but retains full analog/peripheral feature set; versus STM32L031K6U6, it delivers 4× more Flash, integrated EEPROM, and dual comparators - making it optimal for feature-rich, battery-constrained edge devices requiring long-term data integrity.

Availability

STM32L071KBU6 is available at Aetrix Electronics and suitable for smart utility meters, wearable health monitors, industrial sensor nodes, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L071KBU6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in microcontrollers, power management, and sensing technologies for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding extended battery life, robust analog integration, and secure firmware execution - designed specifically for IoT endpoints and energy-harvesting systems.

FAQ

What is the maximum operating frequency and associated power efficiency of the STM32L071KBU6?

The STM32L071KBU6 runs at up to 32 MHz with 0.95 DMIPS/MHz performance and achieves 93 µA/MHz in Run mode from Flash. Its dynamic voltage scaling and multiple low-power modes-including 0.29 µA Standby-enable optimal trade-offs between processing throughput and energy consumption for intermittent workloads.

Does the STM32L071KBU6 support hardware encryption or secure boot features?

No, the STM32L071KBU6 does not include hardware AES, TRNG, or secure boot circuitry. It relies on software-based cryptographic libraries for encryption tasks. For hardware-accelerated security, ST recommends the STM32L072KBU6 variant, which adds AES-128 and TRNG while maintaining identical pinout and package.

How many I/O pins are 5V-tolerant, and which pins are exceptions?

Of its 28 general-purpose I/O pins, 26 are 5V-tolerant (PA0–PA15, PB0–PB11). The exceptions are BOOT0 and NRST, which operate strictly within the 1.65–3.6 V supply range and require level-shifting if driven by 5V logic sources.

Can the integrated 6 KB EEPROM be used for firmware parameter storage across power cycles?

Yes, the 6 KB data EEPROM supports byte-level erase/write operations with ECC protection and guaranteed endurance of 100,000 cycles and data retention of 20 years at 85 °C. It is explicitly designed for storing calibration coefficients, device IDs, and user-configurable parameters that must persist across resets and power loss.