STMicroelectronics STM32L071C8U6

Overview

STM32L071C8U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5x5 mm) package, featuring 64 KB Flash, 20 KB SRAM, 6 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and operating from 1.65–3.6 V across –40 to +125 °C. It delivers 0.95 DMIPS/MHz performance and supports 5 µs wakeup from Flash, targeting battery-powered IoT sensors and portable medical devices.

For engineers reviewing the STM32L071C8U6 datasheet, STM32L071C8U6 pinout, STM32L071C8U6 application, or STM32L071C8U6 equivalent, key selection criteria include standby current (0.29 µA), RTC + RAM retention in Stop mode (0.86 µA), 78 5V-tolerant I/Os, dual ultra-low-power comparators, and integrated bootloader supporting USART/I2C/SPI.

Technical Context

The STM32L071C8U6 implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), clocked up to 32 MHz via internal 16 MHz RC (±1%), PLL, or external crystal (1–25 MHz). Its power architecture includes dynamic voltage scaling, multiple low-power modes (Run, Sleep, Low-power Run/Sleep, Stop, Standby), and dedicated brownout reset (BOR) with five thresholds.

Analog subsystem integration includes a 12-bit ADC with up to 16 channels (1.14 Msps, functional down to 1.65 V), two independent ultra-low-power comparators (with window mode and wake-up capability), temperature sensor, and internal voltage reference (VREFINT). Peripherals are interconnected via a multi-layer AHB/APB matrix supporting concurrent DMA transfers.

Key Specifications

Pinout & Package

STM32L071C8U6 is housed in a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN32) package measuring 5 × 5 mm with 0.5 mm pitch and exposed thermal pad. The package supports reflow soldering and meets ECOPACK2 environmental compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072C8U6, the STM32L071C8U6 omits crypto hardware but matches all ultra-low-power specs-ideal for non-secure sensing. Versus STM32L031F6P6, it delivers 2× Flash, full EEPROM, and richer analog/peripheral integration for feature-complete edge nodes.

Availability

STM32L071C8U6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial predictive maintenance nodes, and asset tracking beacons requiring stable component supply over extended product lifecycles.

Supply support for STM32L071C8U6 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 Access line targets ultra-low-power embedded applications demanding long battery life, robust analog integration, and certified security features-optimized for cost-sensitive, high-volume IoT endpoints.

FAQ

What is the maximum operating frequency and core type of STM32L071C8U6?

The STM32L071C8U6 uses an Arm Cortex-M0+ core with Memory Protection Unit (MPU) and operates at up to 32 MHz. Its performance is rated at 0.95 DMIPS/MHz, validated across the full 1.65–3.6 V supply range and –40 to +125 °C temperature envelope. The core supports Thumb-2 instruction set and includes hardware divide and single-cycle MAC.

Does STM32L071C8U6 support hardware encryption or secure boot?

No, the STM32L071C8U6 does not include hardware cryptographic accelerators (AES, DES, SHA) or secure boot ROM. It lacks a true random number generator (TRNG) and tamper-detection circuitry. For secure firmware updates or encrypted data handling, ST recommends the STM32L072C8U6 variant, which adds AES-128 and TRNG while sharing identical power, memory, and peripheral specifications.

How many I/O pins are 5V-tolerant and what is the pin count/package type?

The STM32L071C8U6 has 25 I/O pins in its UFQFPN32 package, of which 23 are 5V-tolerant. This includes all pins on Port A (PA0–PA15) and Port B (PB0–PB10), excluding NRST and BOOT0. The 32-pin UFQFPN package measures 5 × 5 mm with 0.5 mm pitch and features an exposed thermal pad for enhanced thermal dissipation.

What low-power modes are supported and what is the lowest achievable current draw?

The STM32L071C8U6 supports six low-power modes: Sleep, Low-power Run, Low-power Sleep, Stop, Standby, and Shutdown. The lowest current draw is 0.29 µA in Standby mode with three wakeup pins enabled and RTC disabled. With RTC and 20 KB SRAM retention active in Stop mode, consumption rises to 0.86 µA-verified per DS10690 Rev 7 Section 6.3.36.