STMicroelectronics STM32L071RZT6

Overview

STM32L071RZT6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 192 KB Flash, 20 KB SRAM, 6 KB EEPROM, 12-bit ADC (1.14 Msps), and operating voltage range of 1.65–3.6 V. It delivers 0.95 DMIPS/MHz performance at up to 32 MHz and supports -40 to +125 °C industrial temperature operation in battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM32L071RZT6 datasheet, STM32L071RZT6 pinout, STM32L071RZT6 application, or STM32L071RZT6 equivalent, key selection criteria include standby current (0.29 µA), RTC-enabled stop mode (0.86 µA), 78 I/Os with 5V tolerance, integrated comparators with wake-up capability, and dual-bank Flash with ECC for robust firmware updates.

Technical Context

The STM32L071RZT6 implements a tightly coupled Cortex-M0+ core with Memory Protection Unit (MPU), supporting dynamic voltage scaling across three power ranges to optimize active and low-power mode efficiency. Its interconnect matrix enables concurrent peripheral access without CPU arbitration overhead.

Ultra-low-power operation is achieved through multiple clock domains: a 32 kHz LSE for RTC, factory-trimmed 16 MHz HSI (±1%), and multispeed MSI (65 kHz–4.2 MHz), all feeding into a programmable PLL for precise CPU clock generation. Reset management includes five BOR thresholds and programmable voltage detector (PVD) for system-level supply monitoring.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad - provides mechanical robustness, ease of rework, and thermal dissipation suitable for industrial PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072RZT6, the STM32L071RZT6 trades cryptographic features for lower BOM cost and identical ultra-low-power performance; versus STM32L031K6T6, it delivers 6× more Flash, full EEPROM, dual ADC banks, and 2.4× more I/Os-making it optimal for feature-rich, long-life industrial endpoints where security is managed externally.

Availability

STM32L071RZT6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L071RZT6 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-grade components since 1987.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, industrial temperature resilience, and robust firmware update capabilities-optimized for metering, wearables, and IoT edge nodes.

FAQ

What is the maximum operating frequency and corresponding power supply requirement?

The STM32L071RZT6 operates up to 32 MHz when supplied at 3.0–3.6 V. At lower voltages (1.65–1.95 V), maximum frequency is limited to 16 MHz due to dynamic voltage scaling. Full 32 MHz operation requires VDD ≥ 3.0 V and proper decoupling per Section 6.1.6 of DS10690 Rev 7.

Does STM32L071RZT6 support hardware-based encryption?

No, the STM32L071RZT6 does not integrate AES, DES, or TRNG hardware accelerators. Those features are present in the pin-compatible STM32L072RZT6 variant. For basic secure boot, it relies on Flash protection bits and software-implemented algorithms.

How many I/O pins support 5V tolerance, and under what conditions?

78 of the 84 total I/Os are 5V tolerant when VDD is ≥ 2.0 V. This tolerance applies only in input mode or high-impedance output mode-not during active drive. The remaining 6 pins (including BOOT0, NRST, and SWDIO/SWCLK) are strictly 3.6 V max and require level shifting if interfaced with 5V logic.

What RTC accuracy can be achieved with the internal 32 kHz oscillator?

The internal 37 kHz LSI oscillator provides RTC timing but lacks trimming and achieves ±10% accuracy over temperature and voltage. For precise RTC operation (±20 ppm), an external 32.768 kHz crystal must be connected to PC14/PC15, as specified in Section 3.6 and Table 45 of the datasheet.