STMicroelectronics STM32G041K6U3

Overview

STM32G041K6U3 from STMicroelectronics is an Arm® Cortex®-M0+ 32-bit microcontroller with 32 KB Flash, 8 KB SRAM, 1.7–3.6 V operation, -40°C to 85°C temperature range, and integrated AES-128/256 encryption. It delivers 64 MHz CPU performance, features a 12-bit 0.4 µs ADC (up to 16 external channels), and supports dual USARTs with LIN/IrDA/ISO7816 capability - deployed in smart metering front-ends and industrial sensor nodes requiring secure, low-power edge processing.

For engineers reviewing the STM32G041K6U3 datasheet, STM32G041K6U3 pinout, STM32G041K6U3 application, or STM32G041K6U3 equivalent, key selection criteria include its 28-pin UFQFPN package, 5 V-tolerant GPIOs, hardware RNG, calendar RTC with Stop-mode wakeup, and dual I²C interfaces supporting Fast-mode Plus (1 Mbit/s) with SMBus/PMBus compatibility.

Technical Context

The STM32G041K6U3 implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), enabling secure partitioning of code and data regions. Its clock system integrates four oscillators: 4–48 MHz HSE, 32 kHz LSE with calibration, 16 MHz HSI (±1%), and 32 kHz LSI (±5%), all feeding a flexible PLL for precise peripheral timing.

Peripheral interconnect uses a multi-layer AHB/APB bus matrix with DMA request multiplexer (DMAMUX), allowing five-channel DMA to arbitrate transfers across ADC, timers, USARTs, SPIs, and I²C without CPU intervention - critical for deterministic real-time control in motor drive and power conversion applications.

Key Specifications

Pinout & Package

STM32G041K6U3 is housed in a 28-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN28) package, 4 mm × 4 mm, 0.5 mm pitch, with exposed thermal pad. Pin assignment conforms to ST's standard STM32G041x6 pinout for UFQFPN28 (document DS12993 Rev 4, Table 12).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with STM32G031K6U3, the G041K6U3 adds hardware AES and doubles Flash to 32 KB for secure firmware updates; versus STM32G071K8U3, it trades USB and extra analog resources for lower cost and power - ideal for secure, battery-constrained edge nodes without host interface needs.

Availability

STM32G041K6U3 is available at Aetrix Electronics and suitable for smart metering, industrial sensor nodes, home appliance control, and portable medical diagnostics requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability under extended temperature conditions.

Supply support for STM32G041K6U3 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 components for industrial, automotive, and consumer markets.

The STM32G0 series targets cost-sensitive, ultra-low-power embedded applications demanding security and rich peripheral integration - optimized for battery-powered IoT endpoints and resource-constrained industrial controls.

FAQ

What is the maximum operating frequency and voltage range of the STM32G041K6U3?

The STM32G041K6U3 operates at up to 64 MHz CPU frequency across a supply voltage range of 1.7 V to 3.6 V. Its internal 16 MHz RC oscillator has ±1% accuracy with PLL support, and the device supports dynamic voltage scaling to optimize power vs. performance. Absolute maximum ratings specify VDD/VSS = –0.3 V to 4.0 V, with I/O pins rated for 5 V tolerance on designated FT_e pins.

Does the STM32G041K6U3 support secure boot and firmware authentication?

Yes - the STM32G041K6U3 includes hardware AES-128/256 acceleration, a true random number generator (RNG) compliant with NIST SP800-90B, and Flash readout protection (RDP) levels that prevent unauthorized firmware extraction. Boot ROM implements secure boot checking against signed images stored in Flash, and the securable area allows isolation of cryptographic keys and sensitive routines from application code.

How many I/O pins are 5 V tolerant, and which packages support them?

All 25 GPIOs on the UFQFPN28 package (including PA0–PA15, PB0–PB11, PF0–PF1) are 5 V tolerant when configured as inputs, per ST's electrical characteristics (DS12993 Rev 4, Table 52). This applies specifically to the STM32G041K6U3 in UFQFPN28; other variants (e.g., LQFP32) retain the same I/O tolerance but differ in pin count and layout.

What low-power modes are available, and what is the typical current draw in Shutdown mode?

The STM32G041K6U3 supports Sleep, Stop, Standby, and Shutdown modes. In Shutdown mode with RTC and backup registers disabled, typical current consumption is 100 nA at 25°C (VDD = 3.3 V), per DS12993 Rev 4, Table 31. With RTC enabled and VBAT supplied, current rises to ~300 nA - enabling decade-long battery operation in maintenance-free sensor deployments.