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

STMicroelectronics STM32L031C4U6

Name: STM32L031C4U6
Brand: STMicroelectronics
SKU: STM32L031C4U6
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM32L031C4U6

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 48-UFQFN Exposed Pad

Datasheet:: STM32L031C4U6.pdf

Description:: IC MCU 32BIT 16KB FLASH 48UFQFPN

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Product details

Overview

STM32L031C4U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN28 (4×4 mm) package, featuring 16 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 targets battery-powered sensor nodes and smart meters requiring sub-µA standby current (0.23 µA) and fast 5 µs wakeup.

For engineers reviewing the STM32L031C4U6 datasheet, STM32L031C4U6 pinout, STM32L031C4U6 application, or STM32L031C4U6 equivalent, key selection criteria include verified low-power mode timing (Stop: 0.35 µA, Standby: 0.23 µA), 31 I/Os with 5V tolerance, integrated RTC with 8 KB RAM retention, and bootloader support for USART/SPI.

Technical Context

The STM32L031C4U6 implements a single-core Arm Cortex-M0+ running at up to 32 MHz, supported by dynamic voltage scaling and multiple clock sources: 16 MHz factory-trimmed HSI (±1%), 32 kHz LSE for RTC, and programmable MSI (65 kHz–4.2 MHz). Its interconnect matrix routes peripherals-including ADC, timers, and communication interfaces-without CPU intervention.

Power management integrates five BOR thresholds, programmable voltage detector (PVD), and three low-power modes (Sleep, Stop, Standby) with configurable wakeup sources: 2 dedicated pins in Standby, 16 lines in Stop. The 12-bit ADC supports up to 10 channels down to 1.65 V supply, with typical INL of ±1.5 LSB and conversion rate of 10 ksps at full resolution.

Key Specifications

Parameter	Value and Actual Design Meaning
Core	Arm Cortex-M0+, 32 MHz max - delivers 0.95 DMIPS/MHz for deterministic real-time control in resource-constrained edge nodes.
Memory	16 KB Flash (ECC), 8 KB SRAM, 1 KB EEPROM (ECC) - enables firmware updates with error correction and nonvolatile data logging without external memory.
ADC	12-bit, 1.14 Msps, 10-channel - supports high-speed sensor sampling (e.g., thermistor, pressure) with hardware oversampling for enhanced resolution.
Low-Power Modes	Standby: 0.23 µA (2 wakeup pins); Stop: 0.35 µA (16 wakeup lines); Stop+RTC+RAM: 0.6 µA - extends coin-cell battery life to >10 years in periodic wake-up applications.
Timers	8x timers including 1x 16-bit (4-channel), 2x 16-bit (2-channel), 1x ultra-low-power LPTIM - enables precise pulse generation, PWM control, and sub-second RTC calibration.
I/O Capability	31 I/Os, 5V tolerant - simplifies interface to legacy 5V peripherals and industrial sensors without level-shifting circuitry.
Communication	1x USART (ISO 7816/IrDA), 1x LPUART, 2x SPI (16 Mbit/s), 1x I2C (SMBus/PMBus) - supports secure smart-card readers, low-power telemetry, and multi-sensor I2C buses.

Pinout & Package

STM32L031C4U6 is housed in a 28-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN28) package measuring 4×4 mm with 0.5 mm pitch, optimized for space-constrained PCB layouts in wearables and IoT endpoints.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Main power supply (1.65–3.6 V)	Supplies core and I/O domains; decoupling required per datasheet layout guidelines to maintain stability in low-noise sensing.
VSS	Ground reference	Dedicated analog/digital ground pins ensure clean return paths for ADC and comparators to minimize noise coupling.
NRST	Active-low reset input	Accepts external reset pulses or internal brownout detection; internal pull-up enables reliable startup without external components.
PA0–PA15	General-purpose I/Os	31 total GPIOs (including PB0–PB12); PA0–PA7 support ADC1_IN0–IN7, enabling direct analog sensor connection.
PA13/PA14	SWDIO/SWCLK	Serial Wire Debug interface - allows in-circuit programming and real-time debugging without JTAG overhead or extra pins.
PA2/PA3	USART2_TX/USART2_RX	Full-duplex UART interface supporting ISO 7816 smart-card protocols and IrDA physical layer at up to 4.5 Mbps.
PA4/PA5	SPI1_NSS/SPI1_SCK	Master SPI interface for flash memory or display drivers; SCK supports up to 16 Mbit/s for high-throughput peripheral control.
PA6/PA7	SPI1_MISO/SPI1_MOSI	Full-duplex SPI data lanes - enable simultaneous sensor readout and actuator command transmission in closed-loop systems.

Key Features

Feature	Design Value
Ultra-low-power BOR	5 selectable thresholds (1.6–2.8 V) - ensures robust operation across wide battery discharge curves without false resets.
Embedded EEPROM	1 KB with ECC - stores calibration coefficients, device IDs, or configuration parameters with guaranteed 100k write cycles and 40-year data retention.
Temperature Sensor	Integrated sensor with ±2°C accuracy (–40 to +125 °C) - enables self-monitoring of MCU junction temperature for thermal throttling or ambient sensing.
CRC Calculation Unit	Hardware-accelerated CRC-32 - validates firmware integrity during boot and secures OTA update payloads against bit corruption.
96-bit Unique ID	Factory-programmed serial number - supports secure device authentication, license binding, and anti-cloning in connected products.

Applications

Smart Utility Metering

Wireless Sensor Node

Use Scenario: Battery-powered gas/water meter with hourly pressure/flow readings and LoRaWAN transmission.

IC Role / Device Role / Timing Role: Main controller managing ADC sampling, RTC-triggered wakeup, LPUART-to-LoRa bridge, and EEPROM-based consumption history storage.

Use Value: 0.23 µA Standby current enables >15-year battery life on CR2032; 5 µs wakeup ensures rapid response to tamper events.

Use Scenario: Industrial vibration monitor mounted on rotating machinery with MEMS accelerometer and BLE reporting.

IC Role / Device Role / Timing Role: Signal acquisition unit performing 10 ksps ADC sampling, FFT preprocessing in SRAM, and BLE advertisement burst via USART.

Use Value: 12-bit ADC with hardware oversampling achieves <100 µV RMS noise floor; 31 5V-tolerant I/Os simplify connection to legacy industrial sensors.

Portable Medical Device

Asset Tracking Tag

Use Scenario: Disposable glucose monitor with electrochemical sensor, LCD display, and NFC data transfer.

IC Role / Device Role / Timing Role: Analog front-end controller acquiring sensor current, driving segment LCD via GPIO, and handling ISO 14443-A NFC communication via USART.

Use Value: Dual comparators operate down to 1.65 V for low-voltage sensor threshold detection; integrated VREFINT enables ratiometric ADC measurements without external references.

Use Scenario: GPS-enabled logistics tag reporting location every 6 hours using GNSS and cellular modem.

IC Role / Device Role / Timing Role: Power manager coordinating GNSS cold start, modem sleep/wakeup, and RTC-based scheduling with backup register retention.

Use Value: Stop mode + RTC + 8 KB RAM retention draws only 0.6 µA - preserves context across long idle periods while enabling sub-second position fix recovery.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STM32L011K4T6	8 KB Flash, no EEPROM, identical core/peripherals but reduced memory - lacks 1 KB EEPROM with ECC and has fewer GPIOs (25 vs 31).	Targeted at simpler sensor nodes where EEPROM-based calibration storage is unnecessary and cost sensitivity outweighs feature depth.	Select when firmware size ≤8 KB and nonvolatile parameter storage can be handled externally or via Flash wear-leveling.
EFM32ZG222F32	ARM Cortex-M0+, 32 KB Flash, 4 KB RAM, no EEPROM - features lower active current (114 µA/MHz) but lacks integrated RTC with RAM retention and 5V-tolerant I/Os.	Suitable for energy-harvesting applications with intermittent power, where ultra-low active power matters more than RTC persistence or mixed-voltage interfacing.	Prefer when harvesting energy (e.g., solar, piezo) and system design tolerates external RTC or level shifters for 5V peripherals.

Compared with STM32L031C4U6, STM32L011K4T6 trades EEPROM and I/O count for lower cost in minimal-feature deployments, while EFM32ZG222F32 offers superior active efficiency but requires external components to match the integrated RTC+RAM retention and 5V interface capability.

Availability

STM32L031C4U6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, portable medical devices, and asset tracking tags requiring stable component supply across extended product lifecycles.

Supply support for STM32L031C4U6 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 automotive-grade components since 1987.

The STM32L0 series targets ultra-low-power embedded applications demanding long battery life, robust security, and rich analog integration - specifically engineered for IoT endpoints, energy meters, and portable healthcare devices.

FAQ

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

The STM32L031C4U6 runs at up to 32 MHz with 76 µA/MHz typical current draw when executing code from Flash. At 32 MHz, this equates to ~2.43 mA total active current, verified under 3.0 V supply and room temperature per DS10668 Rev 6 Section 6.3.4.

Does STM32L031C4U6 support hardware encryption or secure boot features?

No - the STM32L031C4U6 does not integrate hardware AES, PKA, or secure boot engines. It relies on software-based cryptographic libraries and external secure elements for advanced security; its TRNG and 96-bit unique ID support basic key derivation and device identity functions.

Can the 1 KB EEPROM be used for storing user firmware updates?

No - the 1 KB EEPROM is intended for small nonvolatile data (e.g., calibration values, device settings). Firmware updates must be written to Flash memory, which supports sector erase and read-while-write operations; EEPROM lacks instruction execution capability and write endurance for code storage.

What debug interfaces are supported, and is SWD available on all package variants?

Serial Wire Debug (SWD) is fully supported via PA13 (SWDIO) and PA14 (SWCLK) on all STM32L031C4U6 packages, including UFQFPN28. No JTAG support is provided; SWD enables full debug, flash programming, and real-time variable inspection using standard ST-LINK v2/v3 probes.

STM32L031C4U6 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 48-UFQFN Exposed Pad

Series:: STM32L0

Packaging:: Tray

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:: 38

Program Memory Size:: 16KB (16K 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 ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

STM32L031C4U6 FAQ

1.How can I place an order for STM32L031C4U6 through Aetrix?

Please submit a Request for Quotation (RFQ) for STM32L031C4U6 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 STM32L031C4U6 reliable?

The price and inventory of STM32L031C4U6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L031C4U6 is usually 5 days.

3.What payment methods are accepted for STM32L031C4U6?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L031C4U6 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM32L031C4U6?

STM32L031C4U6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM32L031C4U6 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 STM32L031C4U6?

For technical support, including STM32L031C4U6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L031C4U6 requirements.

6.How does Aetrix verify that STM32L031C4U6 is sourced from the original manufacturer or authorized distributors?

All STM32L031C4U6 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 STM32L031C4U6 meets industry standards.

7.What is the process for return or replacement of STM32L031C4U6?

All STM32L031C4U6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L031C4U6, 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 STM32L031C4U6 part is unused and in its original packaging.

Return procedure for STM32L031C4U6:

1.Submit a request within 90 days.

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

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