STMicroelectronics STM32G431C8U3

Overview

STM32G431C8U3 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 four ultra-fast comparators - deployed in motor control, digital power conversion, and industrial sensing systems.

For engineers reviewing the STM32G431C8U3 datasheet, STM32G431C8U3 pinout, STM32G431C8U3 application, or STM32G431C8U3 equivalent, key selection criteria include FDCAN support for automotive-grade communication, CORDIC/FMAC hardware accelerators for real-time trigonometric and filtering math, and UCPD interface for USB Type-C™ power delivery control - all within a compact UFQFPN32 (7 × 7 mm) package.

Technical Context

The STM32G431C8U3 implements an Adaptive Real-Time (ART) Accelerator enabling zero-wait-state execution from Flash at 170 MHz, paired with a Memory Protection Unit (MPU) and DSP instruction set for deterministic embedded control. Its analog subsystem integrates two independent 16-bit ADCs with hardware oversampling and 23-channel multiplexing, plus four comparators with programmable hysteresis and window mode.

Digital timing includes two 16-bit advanced motor-control timers (TIM1/TIM8) supporting dead-time generation, emergency stop, and up to 8 PWM channels; one 32-bit general-purpose timer; and a low-power timer (LPTIM1) for sub-microamp wake-up events - all synchronized via a multi-AHB interconnect matrix and configurable clock tree with PLL, internal RC, and crystal oscillator options.

Key Specifications

Pinout & Package

STM32G431C8U3 is housed in a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN32) package with exposed thermal pad, optimized for space-constrained industrial and portable applications. Pin assignments follow ST's standardized UFQFPN32 layout per DS12589 Rev 6 Section 4.3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32G431K8T6, the STM32G431C8U3 provides UCPD and UFQFPN32 packaging for USB-C endpoint integration; versus STM32G474RET6, it trades memory and crypto features for lower BOM cost and smaller footprint - ideal for volume production of compact, analog-rich controllers.

Availability

STM32G431C8U3 is available at Aetrix Electronics and suitable for industrial motor control, digital power conversion, and smart sensor hub applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across manufacturing lots.

Supply support for STM32G431C8U3 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM32G4 series targets high-efficiency digital power, motor control, and analog-intensive embedded systems - combining Cortex-M4 performance with hardware math accelerators, precision analog, and USB-C PD integration in compact packages.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32G431C8U3 achieves 170 MHz maximum CPU frequency using its internal PLL with input from either the 4–48 MHz crystal oscillator or internal 16 MHz RC oscillator. The Adaptive Real-Time (ART) Accelerator enables zero-wait-state execution from Flash memory, eliminating instruction fetch bottlenecks and sustaining 213 DMIPS performance under real-world code execution.

Does STM32G431C8U3 support USB device mode with built-in PHY?

Yes - the STM32G431C8U3 integrates a full-speed (12 Mbit/s) USB 2.0 device interface with on-chip transceiver, supporting BCD (Battery Charging Detection) and LPM (Link Power Management). It does not require an external PHY and operates in device-only mode, compatible with CDC, HID, and MSC class drivers without external components.

How many ADC channels can be used simultaneously with hardware synchronization?

Two independent 16-bit ADCs (ADC1 and ADC2) can be triggered synchronously using shared timer events (e.g., TIM1 TRGO), enabling simultaneous sampling of up to 23 total channels across both converters. This is confirmed in DS12589 Rev 6 Section 3.18, supporting interleaved or parallel acquisition for motor phase current and DC-link voltage measurement.

Is the UCPD peripheral capable of acting as a USB-C power source?

Yes - the UCPD peripheral supports full USB Power Delivery 3.0 specification, including Source, Sink, and Dual-Role Power (DRP) operation. It handles BMC physical layer signaling, policy engine execution, VCONN switching, and VBUS discharge control via dedicated GPIOs, enabling autonomous USB-C power negotiation without host MCU intervention.