STMicroelectronics STM32L031K6T3

Overview

STM32L031K6T3 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 and delivers 76 µA/MHz in Run mode - deployed in battery-powered sensor nodes and smart metering endpoints requiring long-term autonomy.

For engineers reviewing the STM32L031K6T3 datasheet, STM32L031K6T3 pinout, STM32L031K6T3 application, or STM32L031K6T3 equivalent, key selection criteria include standby current (0.23 µA), RTC-enabled Stop mode (0.6 µA with 8 KB RAM retention), 5 µs Flash wakeup time, and 31 I/Os with 5V tolerance - critical for energy-constrained embedded control and industrial sensing designs.

Technical Context

The STM32L031K6T3 integrates a Cortex-M0+ core running up to 32 MHz with dynamic voltage scaling, supported by multiple clock sources: 16 MHz factory-trimmed HSI (±1%), 32 kHz LSE for RTC calibration, and PLL for CPU clock generation. Its low-power architecture includes five operational modes - Run, Sleep, Low-power Run, Stop, and Standby - each with distinct peripheral enablement and current profiles.

Memory subsystem includes ECC-protected 32 KB Flash, 8 KB SRAM, and 1 KB data EEPROM with write endurance of 100 k cycles and 20-year data retention. Analog peripherals comprise a 10-channel 12-bit ADC (down to 1.65 V supply), two comparators with window mode and wake-up capability, and internal temperature sensor with factory calibration.

Key Specifications

Pinout & Package

STM32L031K6T3 is housed in a 32-pin UFQFPN (5 × 5 mm, 0.5 mm pitch) package compliant with ECOPACK®2 environmental standards. This compact, near-chip-scale footprint supports high-density PCB layouts in space-constrained IoT endpoints and portable instrumentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011K4T3, the STM32L031K6T3 adds 1 KB EEPROM and doubles Flash capacity - enabling robust field-upgradable firmware and calibrated sensor storage. Versus STM32L051K8U3, it trades USB for lower static current and smaller die size - optimizing for pure battery longevity over interface versatility.

Availability

STM32L031K6T3 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 extended production lifecycles.

Supply support for STM32L031K6T3 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 solutions for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding sub-µA standby, integrated analog, and secure firmware execution - optimized for battery-operated edge devices where energy efficiency defines product viability.

FAQ

Does STM32L031K6T3 support hardware encryption or secure boot?

No. The STM32L031K6T3 does not integrate hardware cryptographic accelerators or secure boot ROM. It relies on software-based AES libraries and external secure elements for confidentiality. Secure firmware updates must be implemented via authenticated bootloader using external flash or trusted execution environment extensions.

What is the maximum operating frequency when powered at 1.8 V?

At 1.8 V supply, the maximum guaranteed CPU frequency is 16 MHz, per Section 6.3.1 of DS10668 Rev 6. Dynamic voltage scaling restricts clock speed to maintain stability and timing margins; exceeding this requires validation under worst-case process/voltage/temperature corners.

Can the 1 KB EEPROM be used for storing calibration coefficients?

Yes. The 1 KB data EEPROM supports 100,000 write/erase cycles and 20-year data retention at 85 °C. It is specifically designed for infrequent writes of calibration data, device IDs, or user configuration - accessed via dedicated HAL EEPROM drivers with wear-leveling abstraction.

Is there a thermal pad on the UFQFPN32 package, and is it electrically connected?

No. The UFQFPN32 package for STM32L031K6T3 (package code K) has no exposed thermal pad. Pin 32 is VSS, and all 32 terminals are signal/power pins - thermal dissipation relies on PCB copper area connected to VSS pins per layout recommendations in Section 7.4 of the datasheet.