STMicroelectronics STM32L071RZT6TR

Overview

STM32L071RZT6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 192 KB Flash, 20 KB SRAM, and 6 KB EEPROM; features 12-bit ADC (1.14 Msps), dual ultra-low-power comparators, and operates from 1.65 V to 3.6 V across –40 °C to 125 °C - deployed in battery-powered IoT sensor nodes requiring long runtime and RTC-backed data logging.

For engineers reviewing the STM32L071RZT6TR datasheet, STM32L071RZT6TR pinout, STM32L071RZT6TR application, or STM32L071RZT6TR equivalent, key selection criteria include standby current (0.29 µA), wakeup time (5 µs from Flash), 78 I/Os (5V tolerant), and integrated EEPROM endurance (100k cycles) for firmware-safe parameter storage.

Technical Context

The device implements a dual-voltage domain architecture with programmable voltage scaling (PVS) enabling dynamic power optimization across Run, Sleep, Stop, and Standby modes. Its Cortex-M0+ core runs at up to 32 MHz with 0.95 DMIPS/MHz and includes a memory protection unit (MPU) for secure partitioning of code and data spaces.

Peripherals are managed via an interconnect matrix supporting concurrent DMA transfers (7-channel controller) to ADC, USART, SPI, I2C, and timers - enabling deterministic real-time response without CPU intervention. Clock system integrates multiple oscillators (HSI16, LSI, MSI, HSE, LSE) with PLL for flexible frequency synthesis and low-jitter timing control.

Key Specifications

Pinout & Package

LQFP64 package with exposed thermal pad; 64-pin quad flat lead frame, 10 mm × 10 mm body, 0.5 mm pitch, and 1.4 mm max height - optimized for thermal dissipation in compact PCB layouts and compatible with automated optical inspection (AOI).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072RZT6, the STM32L071RZT6TR lacks crypto acceleration but matches all power/performance specs for basic sensing. Against STM32L432KCU6, it trades raw compute for 3× lower standby current and smaller footprint - optimal for energy-constrained edge nodes.

Availability

STM32L071RZT6TR 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 multi-year production cycles.

Supply support for STM32L071RZT6TR 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 ICs, MEMS, and automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power embedded applications - specifically engineered for battery-operated IoT endpoints where energy efficiency, EEPROM reliability, and extended temperature operation are primary design constraints.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32L071RZT6TR operates up to 32 MHz with dynamic voltage scaling. At 32 MHz and 3.3 V, typical Run mode current is 93 µA/MHz (≈3.0 mA total), measured with code executing from Flash and peripherals idle. This value increases with active peripherals - e.g., ADC conversion adds ~41 µA, and USART transmission adds ~12 µA.

Does this MCU support hardware encryption or secure boot features?

No, the STM32L071RZT6TR does not include hardware AES, TRNG, or secure boot engines. It relies on software-based cryptographic libraries for encryption. For hardware-accelerated security, ST recommends the STM32L072xx or STM32L4xxx families, which integrate AES-128, TRNG, and secure firmware install (SFI) capabilities.

How many I/O pins support 5V tolerance, and what is the absolute maximum rating?

78 I/O pins are 5V tolerant (all except BOOT0, NRST, and oscillator pins). The absolute maximum rating for 5V-tolerant pins is VDD + 4 V, with VDD between 1.65 V and 3.6 V. This allows direct interfacing with 5 V logic without external level shifters, provided VDD ≥ 2.0 V during operation.

What is the endurance and data retention specification for the integrated EEPROM?

The 6 KB embedded EEPROM supports 100,000 write/erase cycles and guarantees data retention for 20 years at 85 °C or 40 years at 25 °C. Each byte can be written independently, and ECC is applied automatically during write operations to correct single-bit errors and detect double-bit errors.