STMicroelectronics STM32G491RCT3

Overview

STM32G491RCT3 from STMicroelectronics is an Arm® Cortex®-M4 32-bit microcontroller with FPU, operating up to 170 MHz (213 DMIPS), featuring 512 KB Flash with ECC, 112 KB SRAM (96 KB + 16 KB CCM), and integrated analog peripherals including three 16-bit ADCs, four 12-bit DACs, four rail-to-rail comparators, and four operational amplifiers. It targets motor control, digital power conversion, and industrial sensing applications requiring real-time math acceleration.

For engineers reviewing the STM32G491RCT3 datasheet, STM32G491RCT3 pinout, STM32G491RCT3 application, or STM32G491RCT3 equivalent, key selection criteria include its CORDIC/FMAC hardware accelerators for trigonometric and filtering operations, dual FDCAN 2.0B interfaces with flexible data rate, UCPD controller for USB Type-C™ power delivery, and LQFP64 package with 51 GPIOs supporting 5 V tolerance and external interrupt mapping.

Technical Context

This MCU implements a tightly coupled interconnect matrix enabling concurrent access to flash, SRAM, and peripherals. Its ART Accelerator eliminates wait states during flash execution, while the CORDIC engine computes sine/cosine/tangent in hardware and the FMAC performs real-time FIR/IIR filtering without CPU load.

The analog subsystem integrates four OPAMPs (configurable as PGAs with accessible terminals), internal VREFBUF (2.048 V/2.5 V/2.9 V outputs), and 36-channel ADCs with 0.25 µs conversion time and hardware oversampling-enabling high-precision current/voltage sensing in closed-loop motor drives and SMPS controllers.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32G474RET6, the STM32G491RCT3 adds UCPD, two extra OPAMPs/comparators, and enhanced FMAC/CORDIC-making it uniquely suited for USB-C PD + motor/power control integration. Versus STM32H743VIT6, it delivers superior analog signal chain performance per watt and dedicated hardware for power-conversion math, at lower system cost and complexity.

Availability

STM32G491RCT3 is available at Aetrix Electronics and suitable for industrial motor drives, USB-C power delivery systems, digital power supplies, and high-precision sensor hubs requiring stable component supply across extended production lifecycles.

Supply support for STM32G491RCT3 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 conversion and real-time motor control, integrating math accelerators, rich analog peripherals, and USB-C PD controllers to reduce system-level component count and firmware complexity.

FAQ

What is the maximum operating frequency and associated performance metric?

The STM32G491RCT3 operates at up to 170 MHz with an integer performance rating of 213 DMIPS (Dhrystone MIPS). This is achieved using the Adaptive Real-Time Accelerator (ART) to enable zero-wait-state execution from internal flash memory, verified under standard test conditions with cache enabled and prefetch disabled.

Does this MCU support USB Type-C™ Power Delivery negotiation without external components?

Yes-the STM32G491RCT3 integrates a full USB Type-C™ and Power Delivery (UCPD) controller compliant with USB PD 3.0. It handles physical layer signaling, PD message parsing, VBUS voltage/current control, VCONN switching, and cable detection using on-chip analog front-end circuitry and dedicated firmware libraries.

How many analog-to-digital converter channels does it support, and what is their resolution and speed?

The device integrates three independent 16-bit ADCs supporting up to 36 external channels total. Each ADC achieves 0.25 µs conversion time (up to 4 MSPS) with hardware oversampling that extends effective resolution beyond 16 bits. The conversion range is 0 to VREF+ (up to 3.6 V), and results are stored in 16-bit data registers.

What packaging and thermal characteristics apply to the STM32G491RCT3?

The STM32G491RCT3 uses an LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad. Its thermal resistance θ_JA is 40 °C/W (JEDEC standard board), and maximum junction temperature is 125 °C. The package complies with ECOPACK2 environmental standards and supports reflow soldering per IPC/JEDEC J-STD-020.