STMicroelectronics STM32L071RBH6

Overview

STM32L071RBH6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP64 package, featuring 192 KB Flash with ECC, 20 KB SRAM, 6 KB EEPROM, 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 industrial sensor nodes requiring long battery life and robust analog integration.

For engineers reviewing the STM32L071RBH6 datasheet, STM32L071RBH6 pinout, STM32L071RBH6 application, or STM32L071RBH6 equivalent, key selection criteria include standby current (0.29 µA), RTC + RAM retention in Stop mode (0.86 µA), 5 µs Flash wakeup time, and dual ultra-low-power comparators with wake-up capability down to 1.65 V.

Technical Context

The STM32L071RBH6 integrates a Cortex-M0+ core with memory protection unit (MPU), supporting dynamic voltage scaling and multiple low-power modes including Stop (0.43 µA) and Standby (0.29 µA). Its clock system combines HSE (1–25 MHz), LSE (32 kHz RTC), HSI16 (±1% factory-trimmed), and multispeed MSI (65 kHz–4.2 MHz).

Analog subsystem includes a 12-bit ADC with up to 16 channels, two independent ultra-low-power comparators (operable down to 1.65 V), and internal voltage reference (VREFINT). Peripheral interconnect uses a dedicated matrix enabling concurrent DMA transfers for ADC, USART, SPI, I2C, and timers without CPU intervention.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072RBH6, the STM32L071RBH6 omits crypto hardware but matches all power, timing, and analog specs - ideal for non-secure sensing. Versus STM32L031K6T6, it provides 6× more Flash, EEPROM persistence, and richer peripheral set for complex edge processing.

Availability

STM32L071RBH6 is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, industrial predictive maintenance, and medical wearables requiring stable component supply across extended product lifecycles.

Supply support for STM32L071RBH6 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, specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust analog integration, and secure firmware execution - optimized for metering, wearables, and IoT edge nodes.

FAQ

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

The STM32L071RBH6 operates up to 32 MHz with 0.95 DMIPS/MHz performance. 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 memory and peripherals idle. This value scales linearly with clock frequency and supply voltage per datasheet Table 29.

Does the device support hardware encryption or secure boot features?

No, the STM32L071RBH6 does not integrate hardware cryptographic accelerators (AES, DES, SHA) or secure boot logic. It lacks a true random number generator (TRNG) and ROM-based secure loader. For secure firmware validation or encrypted communication, external co-processors or software libraries must be used - unlike the pin-compatible STM32L072RBH6 which includes AES-128 and TRNG.

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

78 of the 84 fast I/Os are 5V tolerant when configured in input, output, or alternate function modes. Absolute maximum rating for I/O pins is VDD + 4 V (with VDD ≤ 3.6 V), per datasheet Section 6.2. This tolerance simplifies interface with legacy 5V logic or sensors without level shifters.

Can the internal EEPROM be written during normal program execution?

Yes, the 6 KB data EEPROM supports read-while-write (RWW) operation, allowing background writes while code executes from Flash. Each write cycle requires ~4.5 ms per byte/word, and endurance is rated for 100,000 write/erase cycles with 40-year data retention at 55 °C, per datasheet Table 52.