STMicroelectronics STM32L071K8U6

Overview

STM32L071K8U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 64 KB Flash, 20 KB SRAM, 6 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and operation from 1.65 V to 3.6 V across –40 °C to +125 °C. It delivers 0.95 DMIPS/MHz performance and supports battery-powered IoT sensor nodes requiring long-term autonomous operation.

For engineers reviewing the STM32L071K8U6 datasheet, STM32L071K8U6 pinout, STM32L071K8U6 application, or STM32L071K8U6 equivalent, key selection criteria include standby current (0.29 µA), RTC-enabled stop mode (0.86 µA), 5 µs Flash wakeup time, and dual ultra-low-power comparators with wake-up capability down to 1.65 V.

Technical Context

The STM32L071K8U6 integrates a Cortex-M0+ core with Memory Protection Unit (MPU), supporting dynamic voltage scaling and multiple low-power modes including Stop (0.43 µA), Standby (0.29 µA), and Stop+RTC+RAM retention (0.86 µA). Its clock system combines HSI16 (±1%), LSE (32 kHz for RTC), MSI (65 kHz–4.2 MHz), and PLL for flexible frequency synthesis up to 32 MHz.

Analog subsystem includes a 12-bit ADC with 16-channel multiplexing, two independent ultra-low-power comparators (with window mode and wake-up), internal temperature sensor, and VREFINT reference-each functional down to 1.65 V supply. Peripheral interconnect uses a dedicated matrix enabling concurrent DMA transfers to ADC, USART, SPI, I2C, and timers without CPU intervention.

Key Specifications

Pinout & Package

STM32L071K8U6 is housed in a 32-pin UFQFPN (5×5 mm, 0.5 mm pitch) package compliant with ECOPACK2 environmental standards. The package supports compact PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L071K8U6, STM32L072K8U6 adds hardware security without increasing power or size, while STM32L031K6U6 reduces memory and feature set to lower BOM cost-enabling tiered design reuse across product families.

Availability

STM32L071K8U6 is available at Aetrix Electronics and suitable for smart utility meters, wearable health monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L071K8U6 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, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust operation across extended temperature ranges, and integrated analog functionality for sensor-centric edge devices.

FAQ

What is the maximum operating frequency and core architecture of STM32L071K8U6?

The STM32L071K8U6 uses an Arm Cortex-M0+ core with Memory Protection Unit (MPU), operating at up to 32 MHz. It achieves 0.95 DMIPS/MHz performance and supports dynamic voltage scaling to optimize power versus speed. The core is fully compatible with Arm's Thumb-2 instruction set and supports single-cycle I/O access for deterministic peripheral control.

Does STM32L071K8U6 support hardware encryption or secure boot features?

No, STM32L071K8U6 does not include hardware cryptographic accelerators such as AES or TRNG. Secure boot must be implemented in software using its 96-bit unique ID and ECC-protected Flash/EEPROM. For hardware-assisted security, ST recommends the pin-compatible STM32L072K8U6, which adds AES-128 and TRNG modules while retaining identical power and peripheral specifications.

How many I/O pins are 5V tolerant, and what is the minimum supply voltage for analog peripherals?

78 of the 84 fast I/Os on STM32L071K8U6 are 5V tolerant, enabling direct interfacing with legacy 5V logic without level shifters. All analog peripherals-including the 12-bit ADC, comparators, and temperature sensor-operate down to 1.65 V supply, allowing full functionality across the entire rated voltage range (1.65–3.6 V).

What debug interface does STM32L071K8U6 provide, and is SWD supported?

STM32L071K8U6 supports Serial Wire Debug (SW-DP) via SWCLK and SWDIO pins-requiring only two signals for full debug, programming, and trace capabilities. It does not support JTAG. SWD is natively supported by ST-LINK v2/v3, OpenOCD, and all major IDEs (Keil, IAR, STM32CubeIDE), enabling non-intrusive breakpoints, register inspection, and flash programming in production and development environments.