STMicroelectronics STM32L071C8T6

Overview

STM32L071C8T6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 64 KB Flash, 20 KB SRAM, and 6 KB EEPROM; operates from 1.65–3.6 V across –40 to +125 °C; delivers 93 µA/MHz in Run mode and 0.29 µA in Standby with 3 wakeup pins; used in battery-powered IoT sensor nodes requiring long-life operation and integrated analog peripherals.

For engineers reviewing the STM32L071C8T6 datasheet, STM32L071C8T6 pinout, STM32L071C8T6 application, or STM32L071C8T6 equivalent, key selection criteria include ultra-low-power sleep current, 12-bit ADC performance at 1.14 Msps, dual ultra-low-power comparators with wake-up capability, and support for ISO 7816/IRDA on USART interfaces.

Technical Context

The device integrates a Cortex-M0+ core with MPU, running up to 32 MHz via PLL or internal 16 MHz RC (±1%); supports dynamic voltage scaling and multiple low-power modes including Stop (0.43 µA) and Standby (0.29 µA) with RTC and RAM retention. Its interconnect matrix enables concurrent peripheral access without CPU intervention.

Analog subsystem includes a 12-bit ADC with up to 16 channels, two ultra-low-power comparators (operable down to 1.65 V), and internal reference (VREFINT) with calibration data stored in system memory; digital peripherals include 4x USART (2 with ISO 7816), 3x I2C (2 with SMBus), and 6x SPI-all supporting low-voltage operation.

Key Specifications

Pinout & Package

LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 25 general-purpose I/Os (21 5V-tolerant), 3 power supply pins (VDD, VSS, VDDA), and dedicated analog/digital supply domains (VREF+, VREF–, VSSA).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051C8T6, the STM32L071C8T6 adds EEPROM and doubles Flash for field-upgradable firmware; versus STM32L072CZT6, it trades crypto acceleration and pin count for smaller LQFP32 size and lower system-level power in space-constrained deployments.

Availability

STM32L071C8T6 is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, portable medical monitors, and industrial wireless transmitters requiring stable component supply and long-term production continuity.

Supply support for STM32L071C8T6 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 ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32L0 Access line targets ultra-low-power embedded applications where energy efficiency, compact packaging, and integrated analog functionality are critical - optimized for battery-operated endpoints in smart infrastructure and wearables.

FAQ

What is the maximum operating frequency of the STM32L071C8T6?

The STM32L071C8T6 achieves a maximum CPU frequency of 32 MHz using its PLL, which can be driven by the internal 16 MHz HSI oscillator (±1% factory-trimmed) or an external crystal up to 25 MHz. In Run mode, it delivers 0.95 DMIPS/MHz, and dynamic voltage scaling allows reduced core voltage at lower frequencies to minimize active power consumption.

Does the STM32L071C8T6 support hardware encryption?

No, the STM32L071C8T6 does not include a hardware cryptographic accelerator. It lacks AES, DES, or SHA engines found in the STM32L072/L073 series. Security relies on software-based implementations or external secure elements; however, it does provide a 96-bit unique device identifier and supports secure boot via option byte configuration.

Can the internal EEPROM be used for firmware storage?

No - the 6 KB EEPROM is designed exclusively for user data storage (e.g., calibration coefficients, device settings, event logs) and is not executable memory. Firmware must reside in the 64 KB main Flash memory, which supports read-while-write operations across two banks for safe over-the-air updates without halting application execution.

How many I/O pins are 5V tolerant on the LQFP32 package?

Of the 25 available I/O pins in the LQFP32 package, 21 are 5V tolerant (all except PA11, PA12, PA13, PA14, and PA15). This allows direct interfacing with 5V logic families or sensors without level-shifting circuitry, reducing bill-of-materials cost and PCB area in mixed-voltage designs.