STMicroelectronics STM32G431RBT3

Overview

STM32G431RBT3 from STMicroelectronics is a 32-bit Arm® Cortex®-M4 microcontroller with FPU, operating up to 170 MHz (213 DMIPS), featuring 128 KB Flash with ECC, 32 KB SRAM (22 KB + 10 KB CCM), and integrated analog peripherals including dual 12-bit DACs (1 MSPS buffered), dual 16-bit ADCs (0.25 µs conversion), three rail-to-rail op-amps, and four ultra-fast comparators - deployed in motor control, digital power conversion, and industrial sensing systems.

For engineers reviewing the STM32G431RBT3 datasheet, STM32G431RBT3 pinout, STM32G431RBT3 application, or STM32G431RBT3 equivalent, key selection criteria include its 48-pin UFQFPN package, FDCAN support for flexible data-rate automotive/industrial networks, CORDIC/FMAC hardware accelerators for real-time math, and VREFBUF with selectable 2.048 V / 2.5 V / 2.9 V outputs for precision analog subsystems.

Technical Context

The STM32G431RBT3 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 control-loop performance. Its dual-bank Flash supports secure firmware updates with PCROP and 1 KB OTP for configuration storage.

Analog integration includes two independent 16-bit ADCs with hardware oversampling (up to 23 channels), four comparators with programmable hysteresis, and three op-amps configurable as programmable-gain amplifiers (PGA) with all terminals accessible - enabling sensor signal conditioning and closed-loop feedback without external components.

Key Specifications

Pinout & Package

STM32G431RBT3 uses a 48-pin UFQFPN (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are validated per ST's DS12589 Rev 6, Section 4.3 (UFQFPN48 pinout description) and Table 12 (pin definition).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32G431KBT3, the RBT3 offers 12 more GPIOs and UFQFPN thermal performance; versus STM32G474RET6, it trades memory and UCPD for lower cost and smaller footprint - making it optimal for cost-sensitive, analog-rich embedded control where full USB-C or large code size isn't needed.

Availability

STM32G431RBT3 is available at Aetrix Electronics and suitable for industrial motor control, digital power conversion, smart sensor nodes, and human-machine interface designs requiring stable component supply across production lifecycles.

Supply support for STM32G431RBT3 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, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM32G4 series targets high-performance, analog-intensive embedded applications - combining real-time control capability, mathematical acceleration, and rich mixed-signal integration for digital power, motor control, and sensing.

FAQ

What is the maximum operating temperature range for STM32G431RBT3?

The STM32G431RBT3 is qualified for industrial temperature range: –40 °C to +85 °C ambient. This is confirmed in Section 5.3.1 of DS12589 Rev 6, with thermal derating guidelines provided in Section 6.10. The UFQFPN48 package achieves θ_JA = 41.5 °C/W under standard JEDEC PCB conditions.

Does STM32G431RBT3 support hardware encryption or secure boot?

No - the STM32G431RBT3 does not include AES, PKA, or secure boot engines. It provides basic security features: proprietary code readout protection (PCROP), securable memory areas, and 96-bit unique ID. For cryptographic operations, external secure elements or software libraries must be used.

Can the internal op-amps be used as unity-gain buffers without external components?

Yes - all three op-amps support unity-gain buffer configuration using internal routing (no external resistors required). Their inputs and outputs are fully accessible on dedicated pins (e.g., OPAMP1_VINP on PA1, OPAMP1_VOUT on PA0), and they operate rail-to-rail with gain bandwidth up to 10 MHz per DS12589 Rev 6 Section 3.22.

Is the FDCAN controller compatible with classical CAN FD frames?

Yes - the FDCAN controller in STM32G431RBT3 complies with ISO 11898-1:2015 and supports both classical CAN and CAN FD protocols, including flexible data-rate switching, bit rate switching (BRS), and payload lengths up to 64 bytes. Configuration is handled via dedicated FDCAN registers and interrupt lines.