STMicroelectronics STM32G431K6U3

Overview

STM32G431K6U3 from STMicroelectronics is a 32-bit Arm® Cortex®-M4 microcontroller with FPU, operating up to 170 MHz (213 DMIPS), featuring 128 KB Flash with ECC, 32 KB SRAM (22 KB + 10 KB CCM), and integrated analog peripherals including dual 12-bit DACs (1 MSPS buffered), dual 16-bit ADCs (0.25 µs conversion), three rail-to-rail op-amps, and CORDIC/FMAC math accelerators - deployed in motor control, digital power conversion, and industrial sensor processing.

For engineers reviewing the STM32G431K6U3 datasheet, STM32G431K6U3 pinout, STM32G431K6U3 application, or STM32G431K6U3 equivalent, key selection criteria include its UFQFPN32 package footprint, 5 V-tolerant GPIOs, FDCAN support for flexible data-rate automotive/industrial networks, and hardware-accelerated trigonometric filtering for real-time closed-loop control.

Technical Context

The STM32G431K6U3 implements an Arm Cortex-M4 core with single-precision FPU and Adaptive Real-Time (ART) Accelerator enabling zero-wait-state execution from Flash at 170 MHz. Its memory subsystem includes 128 KB Flash with ECC and PCROP, 22 KB SRAM with parity on first 16 KB, and 10 KB CCM-SRAM with parity - all accessible via multi-AHB interconnect matrix.

Analog integration centers on two independent 16-bit ADCs (up to 23 channels, hardware oversampling), four ultra-fast comparators, three configurable op-amps (including PGA mode), and dedicated hardware accelerators: CORDIC for sin/cos/arctan and FMAC for FIR/IIR filter computation - optimized for deterministic signal processing in resource-constrained embedded systems.

Key Specifications

Pinout & Package

STM32G431K6U3 uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 terminals. Pin functions are defined per STMicroelectronics datasheet DS12589 Rev 6, Section 4.1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit ARM Cortex-M4 microcontroller applications.

Compared with STM32G431K6T3, the K6U3 offers superior thermal performance and smaller footprint for space-constrained motor drives; versus STM32G474RET6, it delivers optimal cost-performance balance for single-axis control and digital power without unused peripheral overhead.

Availability

STM32G431K6U3 is available at Aetrix Electronics and suitable for brushless motor drives, digital power supplies, industrial sensor conditioners, and USB-C PD endpoints requiring stable component supply across design-in, NPI, and volume production phases.

Supply support for STM32G431K6U3 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, specializing in microcontrollers, power management, analog, MEMS, and automotive ICs - with over 40 years of embedded systems innovation.

The STM32G4 series targets high-efficiency digital power conversion and real-time motor control, integrating math accelerators and rich analog peripherals to replace discrete signal-chain components in industrial and consumer applications.

FAQ

What is the maximum operating temperature range for STM32G431K6U3?

The STM32G431K6U3 is rated for industrial temperature range: –40°C to +85°C ambient. Its thermal characteristics (R_θJA = 65°C/W in UFQFPN32) support reliable operation at full 170 MHz clock under continuous load when PCB thermal vias and copper pour are implemented per ST AN5072 guidelines.

Does STM32G431K6U3 support hardware encryption or secure boot?

No. The STM32G431K6U3 does not include AES, PKA, or secure boot engines. It features proprietary code readout protection (PCROP) and securable memory areas, but lacks cryptographic accelerators or trusted execution environment - making it unsuitable for applications requiring TLS, secure firmware updates, or payment-grade security.

Can the CORDIC unit compute hyperbolic functions like sinh/cosh?

No. According to STMicroelectronics Reference Manual RM0440, the CORDIC unit in STM32G431K6U3 is configured exclusively for circular (sin/cos/tan/arcsin/arccos/arctan) and linear (multiply/divide) modes. Hyperbolic function support is absent in both hardware implementation and firmware library (HAL/LL) APIs.

Is the internal VREFBUF output stable enough for 16-bit ADC reference use?

Yes. The VREFBUF provides 2.048 V, 2.5 V, or 2.9 V outputs with ±0.5% initial accuracy and ±30 ppm/°C drift over temperature - meeting the 1 LSB (≈76 µV for 16-bit, 3.3 V full-scale) stability requirement for high-accuracy ADC measurements when used with proper decoupling (100 nF + 10 µF).