STM32G431RBT6 ST Mainstream Arm Cortex-M4 Mixed-Signal 32-bit MCU 128KB Flash 32KB SRAM 170MHz FPU OpAmp DAC Comparator CAN FD USB LQFP-64

STM32G431RBT6 Product Overview

STM32G431RBT6 is a Cortex-M4 MCU at 170 MHz with FPU and math accelerator, LQFP-64. 128 KB Flash, 32 KB SRAM, USB 2.0 FS device (crystal-less), CAN FD, two 12-bit ADCs (5 Msps, 21 ch), two 12-bit DACs, four op-amps (PGA), two comparators, advanced motor control PWM, LP timers, RTC, 3×USART/UART, 2×SPI/I2S, 2×I2C. 52 x 5 V-tolerant I/Os. 1.7–3.6 V, -40–85 °C. Compared to the wide-temp RBT3, provides a more cost-effective standard industrial temperature range while retaining all analog and communication features.

STM32G431RBT6 Core Features

Core: Cortex-M4 170 MHz, FPU + ART Accelerator + Math Accelerator (FMAC, CORDIC)

Memory: 128 KB Flash, 32 KB SRAM

Analog: 2×12-bit ADCs (5 Msps, 21 ch), 2×12-bit DACs, 4×PGAs, 2×Comparators

Motor Control: 2×Advanced Timers (PWM/Deadtime/Brake), multiple GP/LP timers

Connectivity: USB 2.0 FS (Crystal-less), CAN FD, 3×USART/UART, 2×SPI/I2S, 2×I2C

I/Os: 52 (5 V-tolerant)

Package: LQFP-64

Temperature: -40°C to 85°C

STM32G431RBT6 Applications

Digital Power: SMPS, Inverters, PFC

Motor Control: FOC, BLDC/PMSM Drives, Servo Controllers

Instrumentation: High-Precision Sensor Conditioning & Data Acquisition

Consumer Electronics: Drones, Power Tools, Portable Medical

Automotive/Industrial: CAN FD Nodes, Industrial Automation

STM32G431RBT6 Key Advantages

128 KB Flash + 170 MHz Cortex-M4 + FPU + Math Accelerator: Large memory and blazing-fast DSP

4 Op-Amps + 2 DACs + 2 Comparators + ADC: Superior analog integration, saves BOM

USB 2.0 + CAN FD: High-speed USB and industrial CAN bus on one chip

52 I/Os in 64-Pin Package: Rich pin resources for complex system integration

Standard Industrial Temp Range: -40–85°C, optimal cost-effectiveness

1.7–3.6 V Wide Supply: Flexible for battery and various power sources

Why Choose QIXINWEI

Years of experience in the electronics industry. Trusted by global customers.

Massive In-Stock Inventory – Ready to ship promptly.

BOM Matching Service – One-stop solution, save time.

PCBA Customization – Professional engineering team creates tailor-made solutions based on your needs.

Cost-Effective & Efficient – Better channel, better cost.

A dedicated team makes your procurement smoother.

Contact us for BOM quotes or PCBA inquiries.

FAQ

1. What is the STM32G431RBT6, and where is it positioned in the STM32G4 series?
The STM32G431RBT6 is a high‑performance mixed‑signal microcontroller from STMicroelectronics' STM32G4 series, built around an Arm® Cortex®‑M4 core with FPU and DSP extensions running at up to 170 MHz, in an LQFP‑64 package. It is a compact, well‑balanced member of the G431 family, providing 128 KB dual‑bank Flash and 32 KB SRAM (plus 10 KB of CCM SRAM). The chip integrates two rail‑to‑rail op‑amps, two ultra‑low‑power comparators, a 12‑bit 5 Msps ADC, and a 12‑bit DAC, while retaining modern communication interfaces such as FDCAN and USB‑C. Compared to the high‑end G474 series, it omits the high‑resolution timer (HRTIM) and offers a more streamlined analog channel count, making it purpose‑built for cost‑sensitive applications that require solid real‑time control, moderate analog signal conditioning, and rich connectivity—such as general‑purpose variable‑frequency drives, digital power supplies, power tools, and industrial sensor nodes.

2. How does the STM32G431RBT6 differ from the G431VBT6 (LQFP‑100) and the G474RBT6? How should I choose based on my needs?
All three are based on the same Cortex‑M4 170 MHz core, but differ in package, I/O count, and peripheral mix. The RBT6 uses an LQFP‑64 package with up to 51 I/Os, while the VBT6 uses an LQFP‑100 with up to 82 I/Os and may offer more communication pinout options. Compared to the G474RBT6, the G431RBT6 mainly lacks the high‑resolution timer (HRTIM) and has fewer op‑amps and comparators (two of each vs. five op‑amps and seven comparators on the G474). If your application is PCB‑area‑sensitive, requires no more than 51 I/Os, and does not need HRTIM or extensive analog channels, the G431RBT6 delivers an optimal mix of features and cost efficiency.

3. Is 128 KB of Flash sufficient? What typical real‑time control programs can it run?
128 KB of Flash can accommodate an optimized motor FOC control firmware, buck/boost converter control algorithms, a CANopen slave stack, and basic safety and protection logic. If your application does not require a complex graphical interface or file system, 128 KB is sufficient. It supports a dual‑bank architecture (each bank 64 KB), enabling safe OTA firmware updates. If more program space is needed, you can upgrade to a variant with larger Flash in the same series (e.g., G474RET6 with 512 KB) or store non‑volatile data in external SPI Flash.

4. What can the built‑in op‑amps and comparators do? Are external analog chips still necessary?
The chip integrates two rail‑to‑rail operational amplifiers and two ultra‑low‑power comparators. The op‑amps can be used for current‑sense signal amplification and sensor signal conditioning (e.g., thermocouples or pressure sensors), eliminating external op‑amps. The comparators are typically used for over‑current protection, zero‑crossing detection, and voltage‑threshold monitoring. Although the channel count is lower than on the G474, it is sufficient for single‑ or dual‑current‑sensing motor‑control or digital‑power applications. These analog blocks are tightly coupled internally with ADCs and timers to form complete control loops, significantly reducing the need for external analog ICs and lowering BOM cost.

5. What high‑speed communication interfaces does the chip offer? Does it support CAN FD?
It integrates up to three FDCAN (Flexible Data‑Rate CAN) controllers, which are backward‑compatible with CAN 2.0 while supporting data rates up to 5 Mbps and payloads up to 64 bytes. Additionally, it provides multiple UARTs, SPIs, I²Cs, and I²S interfaces. All of these can operate simultaneously, making the chip ideal for industrial automation, vehicle networks, and distributed control systems that require high‑speed, reliable communication. Within the LQFP‑64 package, careful pin‑multiplexing allows multiple CAN FD and UART/SPI channels to be brought out concurrently, meeting most field‑communication needs.

6. What can the USB‑C interface on the STM32G431RBT6 do? Does it support Power Delivery?
The integrated USB‑C power‑delivery and communication controller supports USB 2.0 full‑speed device communication and can deliver up to 15 W (5 V/3 A) through simple CC‑pin detection. It does not implement the full USB Power Delivery (PD) protocol. If a complete PD stack is required, an external dedicated PD controller can be added. For applications that do not need PD, the MCU can be powered and communicate directly over USB‑C, making it ideal for portable devices and small USB‑powered instruments.

7. Is the LQFP‑64 package easy to solder? Is it suitable for low‑volume hand assembly?
Very easy. The LQFP‑64 has all pins exposed with a 0.5 mm pitch and can be drag‑soldered with a standard iron and flux—no hot‑air station required. It strikes an excellent balance between mass production and hand prototyping, making it ideal for hobbyists, students, and small teams for rapid development and low‑volume production. The 10 mm × 10 mm size offers great compactness while remaining highly manageable.

8. What is its power consumption like? Is it suitable for industrial wide‑temperature environments?
The STM32G4 series is built on an advanced 90 nm process, with a run‑mode current as low as about 100 µA/MHz. It supports multiple low‑power modes—Sleep, Stop, and Standby—with Standby current dropping to the micro‑amp range. Combined with fast wake‑up times, it is well‑suited for battery‑powered portable industrial equipment and handheld instruments that require long battery life. The chip is typically rated for the industrial temperature range (-40 °C to 85 °C) and can operate reliably over the long term in harsh industrial environments.

9. What development tools are needed for the STM32G431RBT6, and is it compatible with previous STM32 ecosystems?
It is fully compatible with the STM32Cube ecosystem, including the free STM32CubeMX configuration tool, STM32CubeIDE integrated development environment, and the STM32CubeG4 firmware package. If you have previously worked with STM32F3 or STM32F4 series, a large portion of HAL code can be reused; the main adjustments involve analog‑peripheral configuration and pin mapping. Official example projects and reference designs for motor control and digital power are also provided to accelerate development.

10. If I later need HRTIM or more analog peripherals, what upgrade options are available?
If your project later requires high‑resolution PWM (e.g., for LLC or phase‑shifted full‑bridge) or more op‑amps and comparators, you can directly upgrade to the pin‑compatible STM32G474RET6. It provides the full HRTIM, along with five op‑amps and seven comparators, as well as larger Flash and SRAM, with zero hardware changes. If you need greater computational power and even larger SRAM, you can move to the STM32H7 series (such as the STM32H723 or H743). Because all these devices belong to the same STM32 ecosystem, code and hardware designs can be highly reused, and migration effort is minimal.