STMicroelectronics STM32L071KBU6TR

Overview

STM32L071KBU6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) 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 0.86 µA Stop mode + RTC + RAM retention and supports BLE sensor nodes, smart metering endpoints, and battery-powered industrial monitors.

For engineers reviewing the STM32L071KBU6TR datasheet, STM32L071KBU6TR pinout, STM32L071KBU6TR application, or STM32L071KBU6TR equivalent, key selection criteria include verified ultra-low-power modes (0.29 µA Standby), dual ultra-low-power comparators with wake-up capability down to 1.65 V, 4× USART (2 with ISO 7816), and 7-channel DMA supporting ADC/SPI/I2C/USART/timers.

Technical Context

The device implements a tightly coupled Arm Cortex-M0+ core with Memory Protection Unit (MPU), operating at up to 32 MHz with 0.95 DMIPS/MHz performance. Its power architecture integrates five low-power modes-Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby-with dedicated voltage regulators and brownout reset (BOR) having five selectable thresholds.

Clock management includes multiple internal sources (HSI16 ±1%, LSI 37 kHz, MSI 65 kHz–4.2 MHz) plus external options (1–25 MHz HSE, 32 kHz LSE for RTC). The interconnect matrix enables concurrent peripheral access without CPU arbitration, and the embedded 96-bit unique ID supports secure firmware binding.

Key Specifications

Pinout & Package

STM32L071KBU6TR uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32-pin layout optimized for compact PCB footprints and thermal efficiency in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L072KBU6, the STM32L071KBU6TR lacks hardware crypto but matches all power, memory, and peripheral specs - making it optimal for non-secure ultra-low-power control. Versus STM32L031K4U6, it delivers 12× more Flash, full EEPROM, and expanded communication resources at identical package size and price tier.

Availability

STM32L071KBU6TR is available at Aetrix Electronics and suitable for wireless sensor nodes, smart utility meters, industrial condition monitors, and portable medical devices requiring stable component supply across long-lifecycle deployments.

Supply support for STM32L071KBU6TR 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 products for industrial, automotive, and consumer markets.

The STM32L0 Access line targets ultra-low-power embedded applications demanding extended battery life, robust memory integrity, and rich analog integration - optimized for cost-sensitive, space-constrained IoT endpoints.

FAQ

What is the maximum operating frequency of the STM32L071KBU6TR?

The STM32L071KBU6TR operates at up to 32 MHz using its internal 16 MHz HSI oscillator with PLL multiplication or external crystal sources. This frequency is fully supported across the entire 1.65–3.6 V supply range and –40 °C to +125 °C temperature span, with 0.95 DMIPS/MHz performance measured per EEMBC CoreMark.

Does STM32L071KBU6TR support hardware encryption?

No, the STM32L071KBU6TR does not integrate hardware AES or TRNG engines. Those features are present in the pin-compatible STM32L072KBU6 variant. For applications requiring cryptographic acceleration, STM32L072KBU6 is the direct upgrade path; otherwise, software-based encryption libraries can be deployed on the Cortex-M0+ core.

How many I/O pins are 5V tolerant on this device?

STM32L071KBU6TR has 78 I/O pins rated as 5V tolerant - all GPIOs except those assigned to analog functions (e.g., ADC inputs, VREF+, VSSA) or specific low-voltage interfaces (e.g., LSE, LSI). This tolerance applies only when VDD is ≥2.0 V and allows direct interfacing with legacy 5V logic without level shifters.

What debug interface does STM32L071KBU6TR use?

The device supports Serial Wire Debug (SW-DP) via SWCLK and SWDIO pins - a 2-wire ARM standard interface that replaces JTAG for reduced pin count. It enables full breakpoint, watchpoint, and memory access capabilities using common tools like ST-LINK/V2, SEGGER J-Link, or OpenOCD.