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Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

STMicroelectronics STM32L031G6U3TR

Name: STM32L031G6U3TR
Brand: STMicroelectronics
SKU: STM32L031G6U3TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM32L031G6U3TR

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 28-UFQFN

Datasheet:: STM32L031G6U3TR.pdf

Description:: IC MCU 32BIT 32KB FLASH 28UFQFPN

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Product details

Overview

STM32L031G6U3TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in a 28-pin UFQFPN (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 76 µA/MHz in Run mode - ideal for battery-powered sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L031G6U3TR datasheet, STM32L031G6U3TR pinout, STM32L031G6U3TR application, or STM32L031G6U3TR 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 - all critical for energy-constrained embedded control designs.

Technical Context

The STM32L031G6U3TR 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 programmable MSI (65 kHz–4.2 MHz). Its low-power architecture includes five operational modes - Run, Sleep, Low-power Run, Stop, and Standby - each with distinct peripheral enablement and current profiles.

Peripheral interconnect uses a centralized AHB/APB matrix enabling concurrent DMA transfers (7-channel controller) to ADC, USART, SPI, I²C, and timers without CPU intervention. Analog subsystem includes two independent comparators with window mode and wake-up capability down to 1.65 V, plus internal VREFINT and temperature sensor calibrated at production.

Key Specifications

Parameter	Value and Actual Design Meaning
Core	Arm Cortex-M0+, 32 MHz max - enables deterministic real-time control with 0.95 DMIPS/MHz efficiency
Memory	32 KB Flash (ECC protected), 8 KB SRAM, 1 KB EEPROM (ECC) - supports robust firmware updates and data logging in field-deployed devices
Power Consumption	0.23 µA Standby (2 wakeup pins), 0.6 µA Stop + RTC + 8 KB RAM retention - extends coin-cell battery life to >10 years in intermittent-sensing applications
ADC	12-bit, 1.14 Msps, 10-channel, operational down to 1.65 V - allows high-resolution analog acquisition without external supply boosting
Timers	8x timers including 1x ultra-low-power LPTIM, 1x RTC, 2x watchdogs - provides precise timing, calendar functions, and fail-safe supervision
I/O	31 GPIOs (5V tolerant), 38 fast I/Os total - simplifies interface to legacy 5V peripherals and reduces level-shifter count
Clock Sources	HSI16 (±1%), LSE (32 kHz), MSI (65 kHz–4.2 MHz), PLL - eliminates need for external crystals in cost-sensitive designs while maintaining RTC accuracy

Pinout & Package

STM32L031G6U3TR is housed in a 28-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN) package measuring 4 × 4 mm with 0.5 mm pitch. This RoHS-compliant, ECOPACK®2-qualified package supports automated optical inspection and high-density PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Main power supply (1.65–3.6 V)	Primary core and I/O domain supply; decoupling required per datasheet layout guidelines
VSS	Ground reference	Dedicated analog/digital ground plane connection point for noise isolation
NRST	Active-low reset input	Asynchronous reset trigger with internal pull-up; accepts 5V-tolerant logic levels
PA0–PA15	General-purpose I/Os	31 total GPIOs; PA0–PA15, PB0–PB12, PC13–PC15 - configurable as EXTI lines, ADC inputs, or timer channels
PA1	ADC_IN1 / TIM2_CH2	Shared analog input and timer capture channel - enables synchronized sampling and event timing
PA2	USART2_TX / LPUART1_TX	Dual-function UART transmit pin - supports both standard and low-power serial communication
PA3	USART2_RX / LPUART1_RX	Dual-function UART receive pin - allows seamless transition between active and ultra-low-power comms modes
PA4	SPI1_NSS / DAC_OUT1	Chip select for SPI slave or DAC output - enables local analog actuation without external DAC
PA5	SPI1_SCK	Clock output for synchronous peripheral interfacing - supports up to 16 Mbit/s operation
PA6	SPI1_MISO / ADC_IN6	Input for SPI readback or ADC channel 6 - permits sensor data acquisition over same physical trace
PA7	SPI1_MOSI / ADC_IN7	Output for SPI write or ADC channel 7 - enables compact sensor + actuator control loop integration
PA8	CLOCK_OUTPUT / MCO	Programmable clock output (HSI, HSE, MSI, PLL) - aids system-level clock validation and test instrumentation
PA9	USART1_TX	Dedicated full-speed USART transmit - used for debug, host interface, or firmware updates
PA10	USART1_RX	Dedicated full-speed USART receive - complements PA9 for bidirectional host communication
PA13	SWDIO	Serial Wire Debug I/O - enables non-intrusive debugging and programming via 2-pin SWD interface
PA14	SWCLK	Serial Wire Debug clock - synchronizes debug data transfer with minimal pin overhead
PA15	JTDI / SPI1_NSS	Debug input or SPI chip select - configurable for boundary scan or peripheral control
PB0	ADC_IN8 / TIM2_CH3	Analog input or timer capture - supports multi-sensor monitoring with hardware timestamping
PB1	ADC_IN9 / TIM2_CH4	Analog input or timer capture - extends simultaneous channel count for differential sensing
PB2	BOOT1	Boot configuration pin - selects system memory or user Flash boot mode at power-on reset
PB10	I2C1_SCL	I²C clock line - supports SMBus/PMBus-compliant communication with sensors and PMICs
PB11	I2C1_SDA	I²C data line - enables multi-drop bus topology with integrated digital filtering
PC13	LSE_OSC_IN / RTC_OUT	Low-speed crystal input or RTC alarm output - provides accurate timekeeping and wake-up signaling
PC14	LSE_OSC_OUT	Low-speed crystal output - completes 32.768 kHz oscillator circuit for ±20 ppm RTC accuracy
PC15	OSC32_IN / RTC_REFIN	Optional 32 kHz reference input - allows external clock source for enhanced RTC stability
VREF+	Analog reference positive	Connects to internal VREFINT or external precision reference - sets ADC full-scale range
VREF-	Analog reference negative	Connects to VSSA - defines ADC zero-scale baseline for ratiometric measurements

Key Features

Feature	Design Value
Ultra-low-power BOR	5 selectable brownout thresholds (1.6–2.8 V) - ensures reliable reset during battery voltage sag without external supervisor IC
Pre-programmed bootloader	Supports USART and SPI-based firmware updates - eliminates need for dedicated programmer in field maintenance
Serial wire debug (SW-DP)	2-pin debug interface with full flash memory access - reduces test fixture complexity and PCB footprint
ECC on Flash & EEPROM	Single-bit error correction and double-bit error detection - prevents silent data corruption in safety-critical logging
Temperature sensor	Calibrated at production (±1.5°C accuracy) - enables ambient condition monitoring without external sensor BOM cost
Programmable voltage detector (PVD)	Configurable trip points (2.2–2.9 V) - triggers interrupt or reset before brownout, enabling graceful shutdown

Applications

Smart Utility Metering

Wireless Sensor Node

Use Scenario: Battery-powered gas/water meter with hourly pressure/temperature readings and LoRaWAN transmission every 12 hours.

IC Role / Device Role / Timing Role: Main system controller executing sensor acquisition, data encryption, RTC-triggered transmission scheduling, and ultra-low-power sleep management.

Use Value: 0.23 µA Standby current and 5 µs wakeup enable >15-year battery life; integrated AES acceleration (via DMA + peripherals) secures payload without CPU load.

Use Scenario: Industrial vibration monitor mounted on rotating equipment, sampling accelerometer data at 1 kHz and transmitting anomalies via BLE.

IC Role / Device Role / Timing Role: Real-time signal processor using LPTIM for precise sampling intervals and dual comparators for threshold-triggered wake-up from Stop mode.

Use Value: 0.6 µA Stop + RTC + 8 KB RAM retention preserves context across 99.9% duty-cycled operation; 12-bit ADC captures waveform detail without oversampling penalty.

Portable Medical Device

Asset Tracking Tag

Use Scenario: Handheld pulse oximeter with OLED display, SpO₂/PR calculation, and USB-C charging status monitoring.

IC Role / Device Role / Timing Role: System-on-chip managing optical sensor drivers, analog front-end conditioning, display refresh, and battery fuel-gauge via VREFINT/temperature sensor.

Use Value: 31 5V-tolerant I/Os interface directly to display driver and USB-PD controller; 1 KB EEPROM stores calibration coefficients and usage logs with ECC protection.

Use Scenario: GPS-enabled logistics tag reporting location every 6 hours using GNSS + cellular fallback, powered by 1000 mAh Li-SOCl₂ battery.

IC Role / Device Role / Timing Role: Power manager and host controller coordinating GPS module sleep/wake, modem handshaking, and secure OTA update verification.

Use Value: Dual ultra-low-power comparators detect tamper events (case open) and initiate immediate transmission; 96-bit unique ID enables cryptographic device binding.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STM32L011K4T6	16 KB Flash, 2 KB RAM, no EEPROM, identical 28-pin UFQFPN package and core	Lacks EEPROM and reduced RAM limits persistent data storage and complex state machines	Select when firmware size <16 KB and EEPROM not required; lower cost but less field-upgrade flexibility
EFM32PG12B500F1024GL125	ARM Cortex-M4, 1024 KB Flash, 256 KB RAM, 1.4 µA deep sleep, proprietary energy profiler toolchain	Higher performance and memory, but larger QFN64 package and no 5V-tolerant I/Os	Choose for computationally intensive edge AI inference where sleep current <2 µA suffices and board space allows 9×9 mm package

Compared with STM32L011K4T6, the STM32L031G6U3TR adds EEPROM and doubled RAM for robust data logging; versus EFM32PG12B500F1024GL125, it trades raw compute for smaller footprint, 5V I/O compatibility, and proven ST ecosystem support in cost-sensitive industrial designs.

Availability

STM32L031G6U3TR is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, portable medical devices, and asset tracking tags requiring stable component supply across extended product lifecycles.

Supply support for STM32L031G6U3TR 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-grade components since 1987.

The STM32L0 series targets ultra-low-power embedded applications demanding sub-µA standby, integrated analog, and long-life battery operation - optimized for IoT edge nodes, wearables, and energy-harvesting systems.

FAQ

What is the maximum operating frequency and core type of the STM32L031G6U3TR?

The STM32L031G6U3TR features an Arm Cortex-M0+ core rated for up to 32 MHz operation. Its maximum frequency is achieved under 3.0–3.6 V supply with dynamic voltage scaling enabled. The core delivers 0.95 DMIPS/MHz and supports Thumb-2 instruction set for efficient code density and real-time responsiveness in resource-constrained environments.

Does the STM32L031G6U3TR support hardware encryption or security features?

The STM32L031G6U3TR does not integrate dedicated hardware cryptographic accelerators (e.g., AES, SHA, PKA). However, it supports secure firmware updates via its pre-programmed USART/SPI bootloader and includes a 96-bit unique ID for device authentication. Memory protection is enforced through sector write-protection bits in Flash and EEPROM, and the option to lock debug access via option bytes enhances basic IP protection.

Can the STM32L031G6U3TR operate from a single 1.8 V supply?

Yes - the STM32L031G6U3TR is fully specified for operation from 1.65 V to 3.6 V. At 1.8 V, it supports up to 16 MHz CPU frequency (per dynamic voltage scaling tables), retains full functionality of ADC (down to 1.65 V), comparators, and RTC, and achieves 0.35 µA Stop mode current. All 31 GPIOs remain 5V-tolerant regardless of VDD level.

What development tools are officially supported for STM32L031G6U3TR firmware development?

STMicroelectronics officially supports STM32CubeIDE (free Eclipse-based IDE), STM32CubeMX (graphical initialization code generator), and the STM32L0xx Standard Peripheral Library. Hardware tools include ST-LINK/V2-1 debug probes, NUCLEO-L031K6 and NUCLEO-L011K4 evaluation boards, and the STM32 Discovery kits. Keil MDK and IAR Embedded Workbench are also qualified third-party toolchains with full device support.

STM32L031G6U3TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 28-UFQFN

Series:: STM32L0

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Core Processor:: ARM® Cortex®-M0+

Core Size:: 32-Bit Single-Core

Speed:: 32MHz

Connectivity:: I2C, IrDA, LINbus, SPI, UART/USART

Peripherals:: Brown-out Detect/Reset, DMA, POR, PWM, WDT

Number of I/O:: 21

Program Memory Size:: 32KB (32K x 8)

Program Memory Type:: FLASH

EEPROM Size:: 1K x 8

RAM Size:: 8K x 8

Voltage - Supply (Vcc/Vdd):: 1.65V ~ 3.6V

Data Converters:: A/D 10x12b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

STM32L031G6U3TR FAQ

1.How can I place an order for STM32L031G6U3TR through Aetrix?

Please submit a Request for Quotation (RFQ) for STM32L031G6U3TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STM32L031G6U3TR reliable?

The price and inventory of STM32L031G6U3TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L031G6U3TR is usually 5 days.

3.What payment methods are accepted for STM32L031G6U3TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L031G6U3TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM32L031G6U3TR?

STM32L031G6U3TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM32L031G6U3TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STM32L031G6U3TR?

For technical support, including STM32L031G6U3TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L031G6U3TR requirements.

6.How does Aetrix verify that STM32L031G6U3TR is sourced from the original manufacturer or authorized distributors?

All STM32L031G6U3TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32L031G6U3TR meets industry standards.

7.What is the process for return or replacement of STM32L031G6U3TR?

All STM32L031G6U3TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L031G6U3TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STM32L031G6U3TR part is unused and in its original packaging.

Return procedure for STM32L031G6U3TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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