STMicroelectronics STM32L071CZT6

Overview

STM32L071CZT6 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 industrial sensors requiring long-term data logging and secure firmware updates.

For engineers reviewing the STM32L071CZT6 datasheet, STM32L071CZT6 pinout, STM32L071CZT6 application, or STM32L071CZT6 equivalent, key selection criteria include standby current (0.29 µA), RTC + RAM retention in Stop mode (0.86 µA), 78 I/Os (5V tolerant), integrated bootloader (USART/I2C/SPI), and SW-DP debug support for low-power embedded firmware development.

Technical Context

The STM32L071CZT6 implements a dual-bank Flash architecture with read-while-write capability and ECC protection, enabling safe over-the-air firmware updates without halting execution. Its power management includes five BOR thresholds, programmable voltage detector (PVD), and dynamic voltage scaling to optimize active-mode efficiency at 32 MHz.

Timing subsystem integrates multiple clock sources: 32 kHz LSE for RTC calibration, 16 MHz HSI16 factory-trimmed to ±1%, and MSI RC oscillator (65 kHz–4.2 MHz) for flexible low-power wake-up. The 11-timer suite includes two 16-bit advanced timers with up to four channels, one ultra-low-power timer (LPTIM), and dual watchdogs (IWDG/WWDG) for safety-critical monitoring.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch), ECOPACK2-compliant, with exposed thermal pad (not electrically connected). Pin 1 marked by dot or notch; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072CZT6, the STM32L071CZT6 trades crypto acceleration for lower unit cost and identical power/performance in non-secure use cases; versus STM32L031K6T6, it delivers 6× more Flash, EEPROM persistence, and expanded peripheral set for complex edge intelligence tasks.

Availability

STM32L071CZT6 is available at Aetrix Electronics and suitable for smart utility meters, wireless sensor nodes, industrial PLC I/O modules, and medical wearables requiring stable component supply across extended product lifecycles.

Supply support for STM32L071CZT6 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 automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing sub-1 µA standby operation, integrated EEPROM, and robust security features for battery-powered IoT endpoints and industrial edge devices.

FAQ

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

The STM32L071CZT6 operates up to 32 MHz with 93 µA/MHz typical current draw when executing code from Flash. At full speed, total Run mode current is approximately 2.98 mA (32 MHz × 93 µA/MHz), verified per DS10690 Rev 7 Table 29. This value assumes VDD = 3.3 V, 25 °C ambient, and active peripherals minimized.

Does STM32L071CZT6 support hardware encryption or secure boot?

No - the STM32L071CZT6 lacks dedicated cryptographic accelerators (AES, PKA) and secure ROM bootloader. It supports software-based encryption libraries and basic tamper detection via TAMP peripheral, but secure boot requires external secure element or higher-series STM32L072/L082 variants.

How many I/O pins are available in the LQFP48 package, and which are 5V tolerant?

The LQFP48 variant (CZT6) provides 37 general-purpose I/Os. Of these, 34 pins (all except NRST, BOOT0, and VDDA) are 5V tolerant per DS10690 Section 6.3.13, enabling direct interfacing with 5 V logic without level shifters in mixed-voltage systems.

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

Yes - the 6 KB data EEPROM is rated for 100,000 write/erase cycles and 20-year data retention at 55 °C (DS10690 Table 52). It supports byte-level writes and includes ECC for bit-error correction, making it suitable for storing sensor calibration coefficients, device IDs, or configuration parameters that persist through power loss.