STMicroelectronics STM32G031K8T3

Overview

STM32G031K8T3 from STMicroelectronics is a 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 package, operating up to 64 MHz with 64 KB Flash, 8 KB SRAM, and integrated 12-bit ADC (0.4 µs conversion), dual USARTs (one with LIN/ISO7816), and hardware CRC. It targets cost-sensitive industrial control nodes requiring low-power operation (Stop/Standby modes), secure firmware execution, and robust I/O tolerance (5 V-tolerant pins) in space-constrained designs.

For engineers reviewing the STM32G031K8T3 datasheet, STM32G031K8T3 pinout, STM32G031K8T3 application, or STM32G031K8T3 equivalent, key selection criteria include its 64 MHz CPU frequency, 64 KB securable Flash with ROP support, 11 timer suite (including LPTIM for ultra-low-power wakeups), dual Fast-mode Plus I²C interfaces, and verified 1.7–3.6 V supply range with programmable BOR/PVD.

Technical Context

The STM32G031K8T3 implements an Arm Cortex-M0+ core with Memory Protection Unit (MPU), enabling secure partitioning of code and data regions. Its clock system integrates four independent sources: 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.

Peripherals are interconnected via a dedicated AHB/APB matrix supporting concurrent DMA transfers - including a 5-channel DMA controller with configurable request mapping - and feature hardware-accelerated functions such as 16-bit oversampling on the ADC, calendar RTC with alarm/wakeup from Stop/Standby, and two I²C interfaces with SMBus/PMBus support and extra current sink capability.

Key Specifications

Pinout & Package

STM32G031K8T3 is housed in a 5 × 5 mm UFQFPN32 (A0B8) package with 32 leads, 0.5 mm pitch, and exposed thermal pad. This compact, surface-mount package supports high-density PCB layouts and efficient thermal dissipation in fanless enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32G041K8T3, the STM32G031K8T3 trades USB and extra Flash for lower BOM cost and identical low-power performance; versus STM32F031K6T6, it delivers higher CPU throughput, enhanced analog capability, and modern security features - making it optimal for new designs balancing cost, power, and feature density.

Availability

STM32G031K8T3 is available at Aetrix Electronics and suitable for smart energy metering, industrial I/O modules, wireless sensor nodes, and automotive body control applications requiring stable component supply across long product lifecycles.

Supply support for STM32G031K8T3 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 devices for industrial, automotive, and consumer markets.

The STM32G0 series targets entry-level embedded applications demanding high integration, ultra-low power, and robust security - specifically optimized for cost-sensitive, space-constrained, and battery-operated systems requiring Arm Cortex-M0+ efficiency with production-grade reliability.

FAQ

What is the maximum operating frequency and supported voltage range?

The STM32G031K8T3 operates at up to 64 MHz and supports a supply voltage range of 1.7 V to 3.6 V. This range accommodates single-cell lithium batteries (2.5–3.6 V), regulated 3.3 V rails, and brownout conditions down to 1.7 V while maintaining full peripheral functionality and Flash write capability.

Does this MCU support hardware-based security features?

Yes - it includes Readout Protection (ROP) Level 2, which permanently disables SWD debug access and prevents Flash memory readout; a securable Flash area for encrypted firmware partitions; and a 96-bit unique ID for device authentication and secure key derivation in trusted execution environments.

How many communication interfaces does the STM32G031K8T3 provide?

It provides two I²C interfaces (both Fast-mode Plus, 1 Mbit/s), two USARTs (one with LIN/ISO7816 support), one LPUART, and two SPIs (32 Mbit/s). One SPI is multiplexed with I²S, and both USARTs can be configured in synchronous SPI mode - enabling flexible multi-protocol connectivity in resource-constrained designs.

What low-power modes are available and what is the lowest current consumption?

The MCU offers Sleep, Stop (0 and 1), Standby, and Shutdown modes. In Stop 0 mode with RTC running and VDD powered, typical current consumption is 0.32 µA at 25°C - achieved using the LSE oscillator and LPTIM wakeup capability, making it ideal for battery-powered sensing applications with infrequent activity.