STMicroelectronics STM32L031F6P7TR

Overview

STM32L031F6P7TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN28 (4×4 mm) package, featuring 32 KB Flash, 8 KB SRAM, 1 KB EEPROM with ECC, 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 0.6 µA Stop mode + RTC + 8 KB RAM retention for battery-powered sensor nodes and smart meters.

For engineers reviewing the STM32L031F6P7TR datasheet, STM32L031F6P7TR pinout, STM32L031F6P7TR application, or STM32L031F6P7TR equivalent, key selection criteria include verified low-power mode current (0.23 µA Standby), 5 µs Flash wakeup time, 31 I/Os with 5V tolerance, and integrated 32 kHz RTC oscillator with calibration - all confirmed per DS10668 Rev 6.

Technical Context

The device 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%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), HSE (1–25 MHz), and LSE (32.768 kHz). Its interconnect matrix routes peripherals-including ADC, timers, and communication interfaces-without CPU intervention.

Power management integrates five selectable BOR thresholds, programmable voltage detector (PVD), and POR/PDR circuitry enabling robust operation down to 1.65 V. Low-power modes are hierarchically structured: Run → Sleep → Low-power Run → Low-power Sleep → Stop → Standby, with dedicated wakeup lines (2 pins in Standby, 16 in Stop) and hardware-accelerated retention control for 8 KB SRAM.

Key Specifications

Pinout & Package

STM32L031F6P7TR uses the UFQFPN28 (4 × 4 mm, 0.5 mm pitch) package with 28 terminals. This compact, leadless package supports reflow soldering and offers thermal performance suitable for space-constrained industrial and portable applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L011F4P6TR, the STM32L031F6P7TR adds 1 KB EEPROM and doubles Flash capacity - critical for field-upgradable calibration tables. Versus STM32L051K8U6TR, it trades package size and memory headroom for tighter cost and space constraints in volume production.

Availability

STM32L031F6P7TR 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 STM32L031F6P7TR 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 series targets ultra-low-power embedded applications demanding multi-year battery life, robust operation across wide temperature ranges, and integrated analog peripherals - optimized for metering, wearables, and IoT edge nodes.

FAQ

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

The STM32L031F6P7TR runs at up to 32 MHz with 76 µA/MHz typical current draw when executing code from Flash. At full speed, this yields ~2.43 mA total active current, validated per DS10668 Rev 6 Table 24 under VDD = 3.3 V and TA = 25 °C conditions.

Does this MCU support hardware encryption or secure boot features?

No - the STM32L031F6P7TR lacks dedicated cryptographic accelerators or hardware secure boot. It supports software-based AES via its CRC unit and memory protection unit (MPU), but does not include TRNG, PKA, or secure ROM bootloader found in STM32L5 or STM32U5 series.

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

Yes - the 1 KB data EEPROM has ECC protection and guaranteed 100,000 write/erase cycles per sector. It retains data across power loss and supports byte-level writes, making it ideal for storing sensor calibration offsets, device IDs, or user configuration parameters.

Is the UFQFPN28 package RoHS-compliant and compatible with standard reflow profiles?

Yes - the UFQFPN28 package is ECOPACK®2 certified (RoHS-compliant and halogen-free) and qualified for standard Pb-free reflow soldering per JEDEC J-STD-020. Peak temperature must not exceed 260 °C, with ramp rates and soak times matching ST's AN4828 application note.