STMicroelectronics STM32L071KZU6

Overview

STM32L071KZU6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in a 32-pin UFQFPN package, featuring 192 KB Flash with ECC, 20 KB SRAM, 6 KB EEPROM, 12-bit ADC (1.14 Msps), and operation down to 1.65 V. It delivers 0.86 µA Stop mode + RTC + RAM retention and supports up to 32 MHz CPU frequency - deployed in battery-powered IoT sensor nodes requiring long-term autonomous operation.

For engineers reviewing the STM32L071KZU6 datasheet, STM32L071KZU6 pinout, STM32L071KZU6 application, or STM32L071KZU6 equivalent, key selection criteria include ultra-low standby current (0.29 µA), integrated EEPROM endurance (100k cycles), 78 I/Os with 5V tolerance, and dual ultra-low-power comparators with wake-up capability - all validated for industrial-grade (-40 to +125 °C) embedded control.

Technical Context

The STM32L071KZU6 implements a tightly coupled Arm Cortex-M0+ core with Memory Protection Unit (MPU), operating from 32 kHz to 32 MHz via multiple clock sources: HSI16 (±1%), LSE (32.768 kHz RTC), MSI (65 kHz–4.2 MHz), and PLL. Its interconnect matrix enables concurrent peripheral access without bus contention.

Power architecture integrates five low-power modes (Run, Sleep, Low-power Run/Sleep, Stop, Standby), each with distinct voltage regulator states and peripheral gating. The BOR (brownout reset) offers five programmable thresholds, and the PVD supports configurable voltage monitoring - critical for reliable operation across wide battery discharge curves.

Key Specifications

Pinout & Package

STM32L071KZU6 uses a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN) package, 5 mm × 5 mm, 0.5 mm pitch, with exposed thermal pad. Pinout conforms to ST's standardized LQFP32/UFQFPN32 mapping for STM32L0x1 series.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072KZU6, the STM32L071KZU6 omits crypto hardware but retains identical power profiles and analog performance; versus STM32L031K6U6, it delivers 6× more Flash, full EEPROM, and enhanced ADC throughput - making it optimal for feature-rich, field-upgradable edge nodes.

Availability

STM32L071KZU6 is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, smart utility meters, and portable medical devices requiring stable component supply across multi-year production cycles.

Supply support for STM32L071KZU6 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, MEMS, and automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing energy efficiency, integrated nonvolatile memory, and robust operation across industrial temperature ranges - optimized for battery longevity in always-on edge devices.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for STM32L071KZU6?

The STM32L071KZU6 operates up to 32 MHz when supplied between 2.4 V and 3.6 V. At lower voltages (1.65–2.4 V), maximum frequency is reduced to 16 MHz per dynamic voltage scaling rules in DS10690 §4.1. All timing parameters - including ADC conversion, SPI bitrate, and timer resolution - scale accordingly with VDD and CPU clock.

Does STM32L071KZU6 support hardware encryption or secure boot features?

No, the STM32L071KZU6 does not include hardware AES, PKA, or TRNG modules. Secure boot must be implemented in software using its CRC unit and Flash protection features (WRP, RDP). For hardware-accelerated cryptography, ST recommends the pin-compatible STM32L072KZU6, which adds AES-128 and TRNG without changing package or peripheral set.

How many I/O pins are available in the UFQFPN32 package, and which are 5V tolerant?

The STM32L071KZU6 in UFQFPN32 provides 25 usable I/O pins (PA0–PA15, PB0–PB11, plus BOOT0 and NRST). Of these, all GPIOs (PA0–PA15, PB0–PB11) are 5V tolerant per DS10690 §3.7 - verified across -40 to +125 °C and 1.65–3.6 V VDD - enabling direct interface with 5V logic without level shifters.

Can the integrated 6 KB EEPROM be used for storing calibration data across power cycles?

Yes, the 6 KB data EEPROM is designed for persistent storage with guaranteed 100,000 write/erase cycles and 20-year data retention at 55 °C (DS10690 §3.8). It supports byte/word writes, hardware ECC, and sector protection - making it ideal for storing sensor calibration coefficients, device IDs, and user configuration that must survive battery removal or firmware updates.