STMicroelectronics STM32G491RCI3

Overview

STM32G491RCI3 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 high-precision analog signal processing and real-time computation.

For engineers reviewing the STM32G491RCI3 datasheet, STM32G491RCI3 pinout, STM32G491RCI3 application, or STM32G491RCI3 equivalent, key selection considerations include its dual FDCAN support for automotive/industrial networking, CORDIC/FMAC hardware accelerators for trigonometric and filtering math, and UCPD interface for USB Type-C™ power delivery control - all in a compact UFQFPN48 package.

Technical Context

The STM32G491RCI3 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 real-time control. Its analog subsystem integrates three independent 16-bit ADCs (0.25 µs conversion, hardware oversampling), four 12-bit DACs (2 buffered external @ 1 MSPS, 2 unbuffered internal @ 15 MSPS), and four OPAMPs configurable as programmable-gain amplifiers with full terminal access.

Timing and communication are enhanced by two FDCAN controllers supporting flexible data-rate (up to 5 Mbps), a USB 2.0 full-speed interface with LPM/BCD, and a dedicated USB Type-C™/Power Delivery controller (UCPD). The device supports multiple low-power modes (Stop 0/1, Standby, Shutdown) with VBAT-backed RTC and backup registers, and includes true RNG and 96-bit unique ID for secure firmware deployment.

Key Specifications

Pinout & Package

STM32G491RCI3 is housed in a 48-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN48) package, measuring 7 mm × 7 mm with 0.5 mm pitch, suitable for space-constrained industrial and motor control PCBs. It features ECOPACK2-compliant lead-free finish and thermal pad for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32G474RET6, the STM32G491RCI3 adds UCPD and third ADC for USB-C power negotiation and enhanced motor sensing; versus STM32H743VIT6, it trades peak CPU speed for specialized analog/math acceleration and smaller footprint - optimizing for cost-sensitive, analog-intensive embedded control.

Availability

STM32G491RCI3 is available at Aetrix Electronics and suitable for motor control systems, digital power supplies, industrial sensing nodes, and USB-C enabled edge devices requiring stable component supply and long-term industrial lifecycle support.

Supply support for STM32G491RCI3 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 components for industrial, automotive, and consumer markets.

The STM32G4 series targets high-efficiency digital power conversion and real-time motor control, integrating analog precision, math acceleration, and communication flexibility into a single chip - reducing system complexity and bill-of-materials cost.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating of the STM32G491RCI3?

The STM32G491RCI3 operates at up to 170 MHz with an integer performance rating of 213 DMIPS (Dhrystone MIPS), achieved using the Adaptive Real-Time Accelerator (ART) for zero-wait-state execution from Flash memory. This frequency is sustained across the full industrial temperature range (–40°C to +85°C) under specified VDD conditions (1.71–3.6 V).

Does the STM32G491RCI3 support USB Type-C™ Power Delivery, and how is it implemented?

Yes, the STM32G491RCI3 integrates a dedicated USB Type-C™ and Power Delivery controller (UCPD) compliant with USB PD 3.0. It handles physical layer signaling, BMC decoding/encoding, policy engine execution, and VCONN switching - eliminating the need for an external PD controller. The UCPD peripheral connects directly to CC1/CC2 pins and supports role swapping, power contract negotiation, and vendor-defined messages.

How many analog-to-digital converters does the STM32G491RCI3 have, and what are their key capabilities?

The STM32G491RCI3 includes three independent 16-bit analog-to-digital converters (ADCs), supporting up to 36 input channels with 0.25 µs conversion time. Each ADC supports hardware oversampling (up to 256×), differential input mode, and flexible trigger sources. They can operate synchronously for simultaneous sampling - critical for three-shunt motor current reconstruction and high-fidelity sensor acquisition.

What package type and pin count does the STM32G491RCI3 use, and what are its thermal characteristics?

The STM32G491RCI3 uses a 48-pin UFQFPN (Ultra-Fine Pitch Quad Flat No-lead) package measuring 7 mm × 7 mm with 0.5 mm pitch and an exposed thermal pad. Its thermal resistance (θ_JA) is 40.3°C/W under JEDEC-standard PCB conditions (2-layer board, 1 in² copper), enabling reliable operation up to +85°C ambient with standard PCB layout practices and moderate airflow.