Item specifics
Description
STM32G431RBT3 Product Overview
STM32G431RBT3 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, -40–125 °C. Compared to smaller packages, offers more I/Os and ADC channels, with 125°C operation for harsh industrial digital power, motor control, and precision sensing.
STM32G431RBT3 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 125°C
STM32G431RBT3 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, High-Temp Industrial Automation
STM32G431RBT3 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
-40–125°C Wide Temperature: Suitable for harsh industrial and automotive environments
1.7–3.6 V Wide Supply: Flexible for battery and various power sources
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FAQ
1. What is the difference between STM32G431RBT3 and RBT6? What does the “T3” suffix indicate?
Both are identical in processor core (170 MHz Cortex‑M4), Flash (128 KB), SRAM (32 KB), op‑amps (two), comparators (two), and all digital peripherals such as USB‑C and FDCAN. The only difference is the operating temperature range: the RBT3 is rated for -40 °C to +125 °C (extended temperature), while the RBT6 covers -40 °C to +85 °C (industrial). If your equipment is installed near an engine, in a sun‑exposed outdoor cabinet, or in a high‑temperature industrial environment, the RBT3 ensures consistent performance without derating or unexpected resets.
2. What practical benefits does the extended temperature range offer for motor control and digital power applications?
The extended temperature grade means the chip has passed more stringent environmental stress screening. Key parameters—170 MHz operation, 5 Msps ADC accuracy, op‑amp offset voltage—are guaranteed across the full -40 °C to +125 °C range. For compact drives or power modules situated near heat sources where ambient temperatures may exceed 85 °C, choosing the RBT3 directly improves long‑term system reliability without needing extra cooling or worrying about thermal throttling.
3. Is 128 KB of Flash sufficient, and does it support dual‑bank OTA updates?
128 KB of Flash can accommodate optimized motor FOC algorithms, digital power control firmware, and a CANopen stack. It supports a dual‑bank architecture (64 KB per bank), allowing OTA updates by executing from one bank while programming the other, with automatic rollback on failure. This is ideal for remote maintenance of equipment operating in high‑temperature environments.
4. Do the built‑in op‑amps and comparators drift at high temperatures? Can they replace external analog chips?
The two rail‑to‑rail op‑amps and two ultra‑low‑power comparators have guaranteed specifications for input offset voltage and gain‑bandwidth over the entire temperature range. The op‑amps can directly condition current‑sense and sensor signals, while the comparators handle over‑current protection and zero‑crossing detection—reliably even at 125 °C. This integration helps eliminate external analog ICs, reducing BOM cost and board size in compact control designs.
5. Does the chip support CAN FD, and is bus communication stable at high temperatures?
It supports up to three FDCAN controllers, backward‑compatible with CAN 2.0, with data rates up to 5 Mbps and payloads up to 64 bytes. The CAN FD hardware, together with an appropriate transceiver, operates reliably from -40 °C to +125 °C, making it well‑suited for automotive powertrain and industrial automation networks that require real‑time communication across wide temperature swings.
6. What convenience does the USB‑C interface provide in high‑temperature applications?
The on‑chip USB‑C controller supports USB 2.0 full‑speed communication and up to 15 W (5 V/3 A) power delivery via simple CC‑pin detection, without requiring a full USB PD stack. In portable high‑temperature test tools or on‑site debug equipment, the MCU can be powered and communicate directly over USB‑C, eliminating the need for a separate power adapter and simplifying system design.
7. How much does power consumption increase at 125 °C, and how should thermal design be handled?
Static leakage current does rise somewhat at high temperatures, but the STM32G4’s 90 nm low‑power process suppresses leakage effectively. Full‑load power consumption remains within manageable limits. A solid ground copper pour beneath the chip, a multi‑layer PCB, and adequate thermal vias are recommended. No external heatsink is required; with proper board‑level thermal design, the chip can operate reliably at an ambient temperature of 125 °C.
8. Are the development tools and code for the STM32G431RBT3 compatible with the RBT6?
Fully compatible. In STM32CubeMX and STM32CubeIDE, simply select the RBT3 device; all HAL library code and example projects work without modification. If you have existing projects based on STM32F3 or other G4 series MCUs, the code can be reused directly, requiring only a review of peripheral configuration and pin mapping.
9. If I later need higher PWM resolution or more analog channels, what upgrade options are available?
You can directly upgrade to the pin‑compatible STM32G474RET6 (industrial grade) or its extended‑temperature variant. The G474 provides the HRTIM, five op‑amps, and seven comparators, along with larger Flash and SRAM, with zero hardware changes. For even more computational power and graphics capability, consider extended‑temperature models in the STM32H7 series.
10. Why choose the G431RBT3 over the G474 when the G474 offers more features?
The G431RBT3 delivers an extended temperature range combined with a lower cost and a compact LQFP‑64 package. For small‑to‑medium‑scale real‑time control applications that do not require HRTIM or a large number of analog channels but do demand reliable operation at high temperatures—such as automotive sensor interfaces, outdoor motor drives, and high‑temperature industrial nodes—it is an excellent balance of performance, reliability, and cost.