STMicroelectronics STM32L071C8T6TR

Overview

STM32L071C8T6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP32 package, featuring 64 KB Flash, 20 KB SRAM, 6 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and operating from 1.65 V to 3.6 V across –40 °C to 125 °C. It delivers 0.95 DMIPS/MHz performance and supports 5 µs wakeup from Flash, targeting battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM32L071C8T6TR datasheet, STM32L071C8T6TR pinout, STM32L071C8T6TR application, or STM32L071C8T6TR equivalent, key selection criteria include standby current (0.29 µA), RTC + RAM retention capability (0.86 µA), 78 I/Os (5V-tolerant), integrated comparators with wake-up, and dual-clock domain support for precise low-power timing control.

Technical Context

The STM32L071C8T6TR 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 includes a Memory Protection Unit (MPU), and the embedded 16 MHz HSI oscillator is factory-trimmed to ±1% accuracy.

It integrates a full low-power peripheral suite: two ultra-low-power comparators (operable down to 1.65 V), a 16-channel 12-bit ADC with hardware oversampling, seven-channel DMA supporting concurrent transfers, and three I²C interfaces - two with SMBus/PMBus support and one with fast-mode plus capability.

Key Specifications

Pinout & Package

LQFP32 (7 × 7 mm, 0.8 mm pitch), RoHS-compliant, ECOPACK2 certified. 32-pin quad flat package with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072C8T6, the STM32L071C8T6TR omits crypto hardware but maintains identical low-power behavior and peripheral count - ideal for non-secure sensing. Versus STM32L031K6T6, it doubles Flash/SRAM and adds EEPROM and second comparator, enabling richer firmware and dual-threshold monitoring without external components.

Availability

STM32L071C8T6TR is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial sensor nodes, and asset tracking beacons requiring stable component supply and long-term manufacturability.

Supply support for STM32L071C8T6TR 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 analog products for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding extended battery life and robust operation across wide temperature ranges - optimized for energy harvesting, portable medical, and IoT edge nodes.

FAQ

What is the maximum operating frequency of the STM32L071C8T6TR?

The STM32L071C8T6TR operates at up to 32 MHz using its internal 16 MHz HSI oscillator with PLL multiplication or external crystal sources. Core performance is rated at 0.95 DMIPS/MHz, delivering ~30.4 DMIPS at maximum clock speed, validated across the full –40 °C to 125 °C temperature range and 1.65–3.6 V supply.

Does the STM32L071C8T6TR support hardware encryption?

No, the STM32L071C8T6TR does not include hardware cryptographic accelerators such as AES or TRNG. These features are present in the pin-compatible STM32L072C8T6 variant. The L071 relies on software-based cryptography libraries if encryption is required, with no dedicated crypto co-processor or secure key storage.

How many I/O pins are available in the LQFP32 package?

The STM32L071C8T6TR in LQFP32 provides 25 GPIO pins: PA0–PA15 (16 pins), PB0–PB1 (2 pins), and PC13–PC15 (3 pins), plus 4 dedicated power/ground/reset pins (VDD, VSS, NRST, VREF+). Of these, 23 GPIOs are 5V-tolerant, enabling direct interfacing with higher-voltage peripherals without level-shifting circuitry.

What is the minimum supply voltage for RTC operation with RAM retention?

The RTC and full 20 KB SRAM retention remain functional down to 1.65 V in Stop mode, as confirmed in Section 6.3.36 of DS10690 Rev 7. This allows uninterrupted timekeeping and data preservation during deep battery discharge, provided VDD remains ≥1.65 V and the backup domain (PC13–PC15) is properly configured with LSE or LSI clock source.