STMicroelectronics STM32L041G6U6STR

Overview

STM32L041G6U6STR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller featuring 32 KB Flash with ECC, 8 KB SRAM, 1 KB EEPROM with ECC, a 12-bit ADC (1.14 Msps, 10 channels), and hardware AES-128 encryption. It operates from 1.65 V to 3.6 V across –40 °C to +125 °C and delivers 0.6 µA Stop mode + RTC + 8 KB RAM retention - ideal for battery-powered IoT sensor nodes and smart metering endpoints.

For engineers reviewing the STM32L041G6U6STR datasheet, STM32L041G6U6STR pinout, STM32L041G6U6STR application, or STM32L041G6U6STR equivalent, key selection criteria include verified ultra-low-power mode current (0.23 µA Standby), 32 MHz max CPU frequency with 0.95 DMIPS/MHz performance, 31 5V-tolerant I/Os, integrated AES engine, and support for ISO 7816/IRDA via USART.

Technical Context

The STM32L041G6U6STR integrates an Arm Cortex-M0+ core with dynamic voltage scaling and multiple clock sources: 1–25 MHz HSE, 32 kHz LSE for RTC, 16 MHz factory-trimmed HSI (±1%), and multispeed MSI (65 kHz–4.2 MHz). Its low-power architecture supports five power modes - Run, Sleep, Low-power Run, Low-power Sleep, Stop, and Standby - each with defined wakeup latency and peripheral retention.

It features a 7-channel DMA controller servicing ADC, SPI, I²C, USART, timers, and AES; dual ultra-low-power comparators with window mode and wake-up capability down to 1.65 V; and a CRC calculation unit with 96-bit unique ID. The memory subsystem includes ECC-protected Flash and EEPROM, sector write protection, and 20-byte backup registers.

Key Specifications

Pinout & Package

STM32L041G6U6STR is housed in a 28-pin UFQFPN package (4 × 4 mm, 0.5 mm pitch), RoHS-compliant and ECOPACK®2 certified. This compact, near-chip-scale footprint supports high-density PCB layouts for space-constrained portable and wearable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051K8U6, the STM32L041G6U6STR offers identical low-power performance and peripheral set in a smaller 28-pin package, trading Flash capacity for board area savings. Against STM32L031F6P6, it adds hardware security (AES), persistent nonvolatile storage (EEPROM), and enhanced connectivity (LPUART, more I/Os), justifying its use in certified medical or utility-grade deployments.

Availability

STM32L041G6U6STR is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, secure access tokens, and portable medical diagnostics requiring stable component supply across extended product lifecycles.

Supply support for STM32L041G6U6STR 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 devices for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust security, and high analog integration - optimized for IoT edge nodes, wearables, and energy-harvesting systems.

FAQ

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

The STM32L041G6U6STR runs at up to 32 MHz with 0.95 DMIPS/MHz performance. At 32 MHz and 3.3 V, 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 logic. This value scales linearly with frequency and voltage per datasheet Table 24.

Does this MCU support true hardware random number generation?

No, the STM32L041G6U6STR does not integrate a dedicated hardware TRNG. It provides a CRC calculation unit and AES engine but relies on software-based PRNGs seeded by ADC noise or system jitter. For certified randomness, external entropy sources or higher-series STM32L4/L5 MCUs with TRNG must be considered.

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

Yes - the 1 KB data EEPROM supports byte/word programming and erasure with 100 k-cycle endurance and 40-year data retention at 85 °C. It is accessed via dedicated PEC (Program/Erase Controller) registers and protected by write-protection bits, making it suitable for factory-programmed sensor calibration data that must survive field reboots and firmware updates.

Is the UFQFPN28 package lead-free and RoHS compliant?

Yes, the STM32L041G6U6STR in UFQFPN28 packaging is fully RoHS compliant and lead-free, meeting ECOPACK®2 environmental standards. The device uses matte tin surface finish and conforms to JEDEC J-STD-020 moisture sensitivity level MSL3, requiring bake conditioning only if exposed to ambient >60% RH for >168 hours prior to reflow.