STMicroelectronics STM32L071CZT3

Overview

STM32L071CZT3 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP48 package, featuring 192 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 runtime and RTC-backed data logging.

For engineers reviewing the STM32L071CZT3 datasheet, STM32L071CZT3 pinout, STM32L071CZT3 application, or STM32L071CZT3 equivalent, key selection criteria include standby current (0.29 µA), 78 I/Os with 5V tolerance, integrated 32 kHz RTC oscillator with calibration, and dual ultra-low-power comparators with wake-up capability down to 1.65 V.

Technical Context

The STM32L071CZT3 implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), operating at up to 32 MHz using multiple clock sources: 1–25 MHz HSE, 32 kHz LSE for RTC, 16 MHz factory-trimmed HSI, and multispeed MSI (65 kHz–4.2 MHz). Its interconnect matrix enables concurrent peripheral access without CPU arbitration overhead.

Ultra-low-power operation is achieved via five low-power modes (Run, Sleep, Low-power Run, Low-power Sleep, Stop, Standby), dynamic voltage scaling, and hardware-accelerated peripherals including 7-channel DMA supporting ADC, USART, SPI, I2C, and timers - all while maintaining full 5V-tolerant GPIO functionality in active and wake-up states.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch), ECOPACK2-compliant, with exposed thermal pad (not electrically connected). Pin count matches package footprint; all signals mapped per STM32L071CZ device variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072CZT6, the STM32L071CZT3 omits crypto accelerators but retains identical ultra-low-power performance and analog features; versus STM32L031K6T6, it provides 6× more Flash, EEPROM persistence, and expanded communication flexibility - making it optimal for feature-rich, battery-constrained edge nodes.

Availability

STM32L071CZT3 is available at Aetrix Electronics and suitable for smart metering, wearable health monitors, industrial predictive maintenance sensors, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L071CZT3 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 Access line targets ultra-low-power embedded applications demanding extended battery life, robust operation across industrial temperatures, and integrated analog peripherals - optimized for cost-sensitive, high-volume IoT endpoints.

FAQ

What is the maximum operating frequency and core type of the STM32L071CZT3?

The STM32L071CZT3 uses an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS/MHz. Its maximum frequency is constrained by supply voltage: 32 MHz at 3.0–3.6 V, 24 MHz at 2.4–2.99 V, and 16 MHz at 1.65–2.39 V, per dynamic voltage scaling specifications in DS10690 Rev 7 Section 4.1.

Does the STM32L071CZT3 support hardware encryption or secure boot?

No, the STM32L071CZT3 does not include hardware cryptographic accelerators (AES, DES, SHA) or secure boot ROM. Those features are present in the STM32L072 and STM32L082 derivatives. This part relies on software-based encryption libraries and standard boot vector validation, making it suitable for non-security-critical applications.

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

Of the 37 GPIOs available in the LQFP48 package, 78 total I/Os across the STM32L071xZ family are 5V tolerant - meaning they accept up to 5.5 V on input regardless of VDD level. Absolute maximum rating for any I/O pin is VDD + 4 V, with VDD ranging from 1.65 V to 3.6 V, as specified in Section 6.2 of DS10690 Rev 7.

Can the STM32L071CZT3 retain RAM contents during Stop mode, and how much is preserved?

Yes, the STM32L071CZT3 can retain up to 20 KB of SRAM during Stop mode when configured with the "SRAM retention" option. In Stop mode + RTC configuration, 20 KB RAM remains powered and accessible upon wake-up, enabling fast context restoration without reloading variables from Flash or EEPROM.