STMicroelectronics STM32L041G6U7

Overview

STM32L041G6U7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 32 KB Flash, 8 KB SRAM, and 1 KB EEPROM featuring hardware AES-128 encryption, 12-bit ADC (1.14 Msps), and dual ultra-low-power comparators. It operates from 1.65 V to 3.6 V across –40 °C to +125 °C and achieves 0.23 µA Standby mode with 2 wakeup pins-ideal for battery-powered IoT sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L041G6U7 datasheet, STM32L041G6U7 pinout, STM32L041G6U7 application, or STM32L041G6U7 equivalent, key selection criteria include verified low-power mode current specs (0.35 µA Stop, 0.6 µA Stop+RTC), 5 µs Flash wakeup time, 32 MHz max CPU frequency, and UFQFPN28 package compatibility with 28 I/Os (31 I/Os 5V-tolerant total).

Technical Context

The STM32L041G6U7 integrates a Cortex-M0+ core running up to 32 MHz with dynamic voltage scaling, supported by multiple clock sources: 1–25 MHz HSE, 32 kHz LSE for RTC, 16 MHz factory-trimmed HSI, and multispeed MSI (65 kHz–4.2 MHz). Its power architecture includes five BOR thresholds, programmable PVD, and POR/PDR for robust operation in fluctuating supply environments.

Peripherals are interconnected via a dedicated matrix supporting concurrent DMA transfers across ADC, SPI, I²C, USART, timers, and AES. The device implements true low-power design with seven low-power modes-including Stop mode retaining 8 KB RAM and RTC-and hardware-accelerated cryptographic operations enabling secure firmware updates in resource-constrained edge devices.

Key Specifications

Pinout & Package

STM32L041G6U7 is housed in a 28-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN28) package measuring 4 × 4 mm with 0.5 mm pitch, compliant with ECOPACK®2 environmental standards and optimized for space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L041G6U7, STM32L051K8U6 offers double Flash without AES hardware-suitable for non-secure firmware updates-while EFM32PG12B500F1024GL125 trades compactness and embedded EEPROM for raw M4 performance and deeper sleep, making it less optimal for size- and EEPROM-constrained battery nodes.

Availability

STM32L041G6U7 is available at Aetrix Electronics and suitable for smart metering, wearable health monitors, industrial predictive maintenance nodes, and asset tracking beacons requiring stable component supply across long-lifecycle deployments.

Supply support for STM32L041G6U7 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 Access line targets cost-sensitive, ultra-low-power applications demanding extended battery life, robust security, and minimal PCB footprint-optimized for IoT edge nodes and portable medical devices.

FAQ

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

The STM32L041G6U7 runs at up to 32 MHz with dynamic voltage scaling. At 32 MHz and 3.3 V supply, typical Run mode current is 76 µA/MHz (≈2.43 mA total), measured with code executing from Flash memory and all peripherals disabled except core and SysTick. This value scales linearly with clock speed under constant voltage.

Does the device support hardware debugging, and which interface is used?

Yes, the STM32L041G6U7 supports Serial Wire Debug (SW-DP) via SWCLK and SWDIO pins (PA14/PA13), enabling full JTAG-style debugging including breakpoints, watchpoints, and real-time memory inspection. No external debug probe is required beyond standard ST-LINK/V2 or compatible CMSIS-DAP adapters.

How is the 1 KB EEPROM implemented, and what endurance does it offer?

The 1 KB data EEPROM is embedded in silicon with built-in ECC and supports 100,000 write/erase cycles and 20-year data retention at 85 °C (per DS10780 Rev 6, Table 47). It is accessed via dedicated PEC (Program/Erase Controller) registers and operates independently of Flash memory, allowing simultaneous read/write operations.

Can the ultra-low-power comparators operate independently of the CPU in Stop mode?

Yes, both comparators retain full functionality in Stop mode, including window mode detection and generation of wakeup events on PA0–PA15 or PC13–PC15 pins. They draw only ~200 nA each in this state and require no CPU clock-enabling autonomous analog monitoring while the core remains powered down.