STMicroelectronics STM32L031K6T3TR

Overview

STM32L031K6T3TR 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 STM32L031K6T3TR datasheet, STM32L031K6T3TR pinout, STM32L031K6T3TR application, or STM32L031K6T3TR equivalent, key selection criteria include verified low-power mode current consumption (0.35 µA Stop, 0.6 µA Stop+RTC), 31 I/Os with 5V tolerance, integrated 1 KB EEPROM with ECC, and support for SWD debug interface - all confirmed in DS10668 Rev 6.

Technical Context

The STM32L031K6T3TR implements a single-core Arm Cortex-M0+ running at up to 32 MHz, with dynamic voltage scaling enabling operation across three power ranges (1.65–3.6 V). Its clock system integrates five sources: HSE (1–25 MHz), LSE (32 kHz), HSI16 (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a PLL for CPU clock multiplication.

Power management includes five low-power modes (Run, Sleep, Low-power Run, Low-power Sleep, Stop, Standby), with hardware-assisted wakeup via 16 EXTI lines or two comparators. The device embeds a CRC calculation unit, 96-bit unique ID, and supports serial wire debug (SW-DP) without requiring additional pins.

Key Specifications

Pinout & Package

STM32L031K6T3TR is housed in a 32-pin UFQFPN (Ultra Thin Fine Pitch Quad Flat No-lead) package measuring 5 × 5 mm with 0.5 mm pitch. This RoHS-compliant, ECOPACK®2-qualified package supports automated optical inspection and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L031K6T3TR, STM32L011K4T3 sacrifices EEPROM and Flash capacity for lower cost in basic sensing, while STM32L051K8T3 adds USB and doubles Flash without changing layout - making it optimal for scalable product families requiring field-upgradable firmware.

Availability

STM32L031K6T3TR is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and industrial control panels requiring stable component supply and long-term lifecycle assurance.

Supply support for STM32L031K6T3TR 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 components for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust operation across extended temperature ranges, and integrated analog peripherals - optimized for IoT edge nodes and energy-constrained industrial systems.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32L031K6T3TR achieves a maximum CPU frequency of 32 MHz. At this speed, typical current consumption is 76 µA/MHz when executing code from Flash memory, equating to approximately 2.43 mA total. This value is measured under 3.3 V supply and 25 °C ambient, per DS10668 Rev 6 Table 24.

Does the device support hardware error correction for Flash and EEPROM?

Yes. The STM32L031K6T3TR integrates hardware ECC (Error Correction Code) for both its 32 KB Flash memory and 1 KB data EEPROM. This detects and corrects single-bit errors and detects double-bit errors, ensuring data integrity in mission-critical applications exposed to radiation or voltage fluctuations.

How many I/O pins support 5V tolerance, and which ones are they?

31 I/O pins are 5V tolerant: all GPIOs on Port A (PA0–PA15), Port B (PB0–PB15), and Port C (PC0–PC1), excluding NRST, BOOT0, and VDDA/VSSA. Tolerance applies across the full operating voltage range (1.65–3.6 V), enabling direct interfacing with 5V logic without external level shifters.

Can the internal RTC operate while the MCU is in Standby mode?

Yes. The RTC continues running in Standby mode when powered by the VBAT supply. It retains timekeeping function and can generate wakeup events via alarm or periodic interrupt, with typical current draw of 0.23 µA - confirmed in DS10668 Rev 6 Section 3.6 and Table 32.