STMicroelectronics STM32L031K6U6TR

Overview

STM32L031K6U6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5 × 5 mm) package, featuring 32 KB Flash with ECC, 8 KB SRAM, 1 KB EEPROM, 12-bit ADC (1.14 Msps), and dual ultra-low-power comparators. It operates from 1.65–3.6 V across –40 to +125 °C, delivering 76 µA/MHz in Run mode and 0.35 µA in Stop mode - ideal for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L031K6U6TR datasheet, STM32L031K6U6TR pinout, STM32L031K6U6TR application, or STM32L031K6U6TR equivalent, key selection criteria include verified low-power mode current (0.35 µA Stop, 0.6 µA Stop+RTC+RAM retention), 31 I/Os with 5V tolerance, integrated 1 KB EEPROM with ECC, and SWD debug support - all confirmed in DS10668 Rev 6.

Technical Context

The STM32L031K6U6TR implements a single-core Arm Cortex-M0+ running at up to 32 MHz with 0.95 DMIPS/MHz performance, supported by dynamic voltage scaling and multiple clock sources: HSI16 (±1%), LSE (32 kHz RTC), MSI (65 kHz–4.2 MHz), and external 1–25 MHz crystal. Its interconnect matrix routes peripherals-including ADC, timers, and communication interfaces-without CPU intervention.

Power management integrates ultra-low-power BOR with five threshold levels, programmable voltage detector (PVD), and POR/PDR circuitry. Low-power modes are hardware-optimized: Standby draws only 0.23 µA with two wakeup pins, while Stop mode retains full RAM and RTC with configurable wakeup lines (16 total) and 5 µs wakeup latency from Flash.

Key Specifications

Pinout & Package

STM32L031K6U6TR uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package per STMicroelectronics mechanical drawing DL2024-1. All 32 terminals are defined in Table 15 of DS10668 Rev 6, with dedicated power, ground, reset, clock, and multifunction I/O pins supporting flexible peripheral mapping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L031K6U6TR, STM32L011K4U6TR reduces memory and omits EEPROM for cost-sensitive minimal nodes, while STM32L051K8U6TR adds capacity and analog features for scalable designs - both share identical UFQFPN32 footprint and low-power behavior.

Availability

STM32L031K6U6TR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and asset tracking beacons requiring stable component supply across long product lifecycles.

Supply support for STM32L031K6U6TR 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 automotive semiconductors since 1987.

This device belongs to the STM32L0 Access line - engineered specifically for ultra-low-power embedded applications where battery life, thermal constraints, and code density are critical, targeting industrial IoT, wearables, and metering.

FAQ

What is the maximum operating frequency and core type of STM32L031K6U6TR?

The STM32L031K6U6TR features an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS/MHz performance. Its maximum frequency is achievable across the full 1.65–3.6 V supply range and –40 to +125 °C temperature span, validated per DS10668 Rev 6 Section 6.3.1.

Does STM32L031K6U6TR include hardware error correction for memory?

Yes - both the 32 KB Flash and 1 KB EEPROM integrate hardware ECC (Error Correction Code), detecting and correcting single-bit errors and detecting double-bit errors. This is documented in Section 2.1 and Table 46 of DS10668 Rev 6, ensuring data integrity in mission-critical logging and firmware storage.

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

31 of the 38 I/Os on STM32L031K6U6TR are 5V tolerant, enabling direct interface with legacy 5V peripherals without level shifters. The device is packaged in UFQFPN32 (5 × 5 mm, 0.5 mm pitch), confirmed in Table 1 and Section 7.4 of DS10668 Rev 6.

What low-power modes does STM32L031K6U6TR support, and what are their typical currents?

It supports Standby (0.23 µA, 2 wakeup pins), Stop (0.35 µA, 16 wakeup lines), and Stop+RTC+8 KB RAM retention (0.6 µA). These values are measured at 25 °C, 3.0 V, and specified in Tables 31–32 of DS10668 Rev 6 - all validated with internal regulators enabled and no peripherals active.