STMicroelectronics STM32G474RBT3

Overview

STM32G474RBT3 from STMicroelectronics is a 32-bit Arm® Cortex®-M4 microcontroller with FPU, operating up to 170 MHz (213 DMIPS), featuring 512 KB Flash with ECC, 96 KB SRAM (32 KB with hardware parity), and integrated high-resolution timer (HRTIM) with 184 ps resolution. It integrates CORDIC and FMAC math accelerators, 5×12-bit ADCs (0.25 µs conversion), 7×12-bit DACs, and 3×FDCAN controllers - deployed in motor control, digital power supplies, and industrial automation systems.

For engineers reviewing the STM32G474RBT3 datasheet, STM32G474RBT3 pinout, STM32G474RBT3 application, or STM32G474RBT3 equivalent, key selection criteria include HRTIM timing precision, dual-bank Flash read-while-write capability, analog peripheral integration (OPAMPs, COMP, VREFBUF), and FDCAN FD support for real-time distributed control networks.

Technical Context

The STM32G474RBT3 implements an Adaptive Real-Time (ART) Accelerator enabling zero-wait-state execution from Flash memory, paired with a Memory Protection Unit (MPU) for secure task isolation. Its interconnect matrix routes 16 DMA channels across multiple AHB/APB buses, supporting concurrent high-bandwidth transfers between peripherals including QUADSPI, FSMC, and USB FS.

It features three independent FDCAN controllers compliant with ISO 11898-1:2015 (CAN FD), each supporting flexible data-rate up to 5 Mbit/s, alongside a dedicated UCPD interface for USB Type-C™ power delivery negotiation - enabling single-chip implementation of bidirectional power and communication in compact embedded systems.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with 42 general-purpose I/Os - all mappable to external interrupt vectors, up to 38 pins 5 V tolerant. Includes dedicated HRTIM output pins (CHxA/CHxB), FDCAN_RX/TX pairs, UCPD_CC1/CC2, and VREF+/- for precision analog reference routing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-performance mixed-signal microcontroller applications.

Compared with STM32G474RET6, the STM32G474RBT3 trades I/O count and memory headroom for compact LQFP48 packaging and identical analog/motor control IP - making it optimal for space-constrained digital power and motor modules. Against STM32H743VIT6, it delivers superior deterministic timing and lower-power analog integration at the expense of peak integer throughput.

Availability

STM32G474RBT3 is available at Aetrix Electronics and suitable for motor control systems, digital power supplies, industrial PLC I/O modules, and USB-C PD sink devices requiring stable component supply across extended production lifecycles.

Supply support for STM32G474RBT3 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 precision motor control, integrating math accelerators (CORDIC/FMAC), ultra-precise timers (HRTIM), and robust analog front-ends to replace multi-chip solutions in cost- and space-sensitive applications.

FAQ

What is the maximum operating temperature range for STM32G474RBT3?

The STM32G474RBT3 is rated for industrial temperature range: –40 °C to +85 °C ambient. Its thermal characteristics (θ_JA = 47.5 °C/W in LQFP48) support continuous operation at full 170 MHz clock under natural convection cooling with standard PCB copper pour. Derating is not required below 85 °C ambient.

Does STM32G474RBT3 support hardware encryption or secure boot?

Yes - it includes a true random number generator (RNG), CRC calculation unit, and securable memory area with proprietary code readout protection (PCROP). While it lacks a dedicated cryptographic accelerator (AES/SHA), PCROP enables secure bootloader partitioning and firmware IP protection against unauthorized readout or overwrite.

Can the HRTIM module generate complementary PWM outputs with programmable dead time?

Yes - HRTIM provides six independent 16-bit timers with fully programmable dead-time insertion (down to 184 ps steps), automatic fault shutdown, and synchronous update of all channels. Each timer supports complementary output pairs (CHxA/CHxB) with independent polarity, burst mode, and carrier modulation for advanced power topologies.

Is the internal 16 MHz RC oscillator accurate enough for USB communication?

No - the internal 16 MHz RC oscillator has ±1% tolerance, exceeding USB full-speed's ±0.25% requirement. For USB operation, the device must use either the 4–48 MHz HSE crystal (with PLL) or the 32 kHz LSE + PLL configuration to generate a precise 48 MHz USB clock. The internal RC is suitable only for non-USB applications or as fallback clock source.