STMicroelectronics STM32L041K6U7

Overview

STM32L041K6U7 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, 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 STM32L041K6U7 datasheet, STM32L041K6U7 pinout, STM32L041K6U7 application, or STM32L041K6U7 equivalent, key selection criteria include verified ultra-low-power operation (0.23 µA Standby), 31 I/Os with 5V tolerance, integrated AES engine, dual ultra-low-power comparators with wake-up capability, and support for ISO 7816/IRDA via USART.

Technical Context

The STM32L041K6U7 integrates a Cortex-M0+ core running up to 32 MHz with 0.95 DMIPS/MHz performance and dynamic voltage scaling. Its low-power architecture includes five operational modes (Run, Sleep, Low-power Run, Low-power Sleep, Stop, Standby), each with deterministic current consumption and wakeup latency - e.g., 5 µs wakeup from Flash and 65 µs from Stop mode.

Clock management combines multiple sources: HSE (1–25 MHz), LSE (32 kHz RTC-calibrated), HSI16 (16 MHz ±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), and PLL for CPU clock derivation. Analog subsystem includes two independent comparators (window mode, wake-up capable down to 1.65 V) and a temperature sensor with factory calibration.

Key Specifications

Pinout & Package

STM32L041K6U7 is housed in a UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 terminals, optimized for space-constrained portable and wearable applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051K6U6, the STM32L041K6U7 trades 2 KB SRAM and one USART for identical ultra-low-power performance and lower unit cost; versus STM32L031F6P6, it adds EEPROM persistence, dual comparators, and hardware AES - enabling secure, long-term data logging in resource-constrained endpoints.

Availability

STM32L041K6U7 is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, industrial predictive maintenance, and medical wearable devices requiring stable component supply across extended product lifecycles.

Supply support for STM32L041K6U7 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 products for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing sub-µA standby operation, integrated security, and robust analog peripherals for battery-operated and energy-harvesting systems.

FAQ

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

The STM32L041K6U7 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.

Does the device support hardware-based secure boot or trusted execution?

No - the STM32L041K6U7 does not include a secure boot ROM, TrustZone, or tamper-detection circuitry. It provides hardware AES-128 for data encryption and ECC on Flash/SRAM for reliability, but secure boot must be implemented in firmware using external secure elements or custom key management.

Can the 1 KB EEPROM be used for parameter storage across power cycles without wear leveling?

Yes - the integrated 1 KB EEPROM is rated for 100,000 write/erase cycles and 20-year data retention at 85 °C. ST provides HAL drivers with built-in wear leveling and atomic write routines; no external EEPROM or flash emulation layer is required for robust parameter storage.

Which development tools are officially supported for debugging and programming?

ST officially supports STM32CubeIDE, STM32CubeMX, and ST-LINK/V2-1 debug probes. The device implements Serial Wire Debug (SWD) with full SW-DP compliance, enabling breakpoints, register inspection, and flash programming. Pre-programmed USART/SPI bootloader also allows programming via UART-to-USB adapters without a debugger.