STMicroelectronics STM32G431KBT3

Overview

STM32G431KBT3 from STMicroelectronics is an Arm® Cortex®-M4 32-bit 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), 4 comparators, 3 op-amps, and CORDIC/FMAC math accelerators - deployed in motor control, digital power conversion, and industrial sensing systems.

For engineers reviewing the STM32G431KBT3 datasheet, STM32G431KBT3 pinout, STM32G431KBT3 application, or STM32G431KBT3 equivalent, key selection criteria include its 48-pin UFQFPN package, FDCAN support, 5 V-tolerant I/Os, low-power timer with sub-microsecond wakeup, and hardware RNG for secure boot - all critical for real-time embedded designs requiring mixed-signal precision and deterministic timing.

Technical Context

The STM32G431KBT3 implements a tightly coupled Cortex-M4 core with FPU and Adaptive Real-Time (ART) Accelerator enabling zero-wait-state execution from Flash at 170 MHz. Its interconnect matrix routes 14 timers (including two 16-bit advanced motor-control timers with dead-time generation), dual ADCs with hardware oversampling, and dual DACs with independent buffering and speed grading (1 MSPS vs. 15 MSPS).

Analog subsystem integration includes three rail-to-rail op-amps configurable as programmable-gain amplifiers (PGA), four ultra-fast comparators with window mode, and an internal voltage reference buffer (VREFBUF) supporting selectable 2.048 V / 2.5 V / 2.9 V outputs - all sharing common analog supply domains and calibrated against factory-trimmed references.

Key Specifications

Pinout & Package

STM32G431KBT3 uses the UFQFPN48 (7 × 7 mm) package with 48 terminals, optimized for thermal performance and board space efficiency in motor control and power conversion applications. Pin functions are validated per STMicroelectronics Doc ID033212 Rev 6, Section 4.3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32G431CBT6, the KBT3's UFQFPN48 saves 42% board area and improves thermal dissipation in sealed enclosures; versus STM32G474RET6, it delivers 92% of compute throughput at 58% of BOM cost and 63% of package volume - making it optimal for cost-sensitive, space-constrained digital power and motor control.

Availability

STM32G431KBT3 is available at Aetrix Electronics and suitable for motor control systems, digital power converters, industrial sensor hubs, and USB-C PD sink implementations requiring stable component supply across production lifecycles.

Supply support for STM32G431KBT3 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM32G4 series targets high-performance, cost-sensitive embedded applications demanding rich analog integration, real-time determinism, and mathematical acceleration - specifically engineered for digital power, motor control, and intelligent sensing.

FAQ

What is the maximum operating temperature range for STM32G431KBT3?

The STM32G431KBT3 is rated for industrial temperature range: –40 °C to +85 °C ambient. Its thermal characteristics (θ_JA = 52 °C/W, θ_JC = 22 °C/W) allow sustained 170 MHz operation at full load within this range when mounted on a 4-layer PCB with 1 oz copper and ≥2 cm² thermal pad exposure.

Does STM32G431KBT3 support hardware encryption for secure boot?

No - the STM32G431KBT3 does not integrate AES, PKA, or TRNG-based key derivation engines. It supports basic secure features: proprietary code readout protection (PCROP), securable memory areas, and 96-bit unique ID. For certified secure boot, ST recommends STM32G474 or STM32L5 series with dedicated cryptographic accelerators.

Can the internal op-amps be used as unity-gain buffers for ADC reference voltage?

Yes - all three op-amps support unity-gain configuration with rail-to-rail output. When paired with the internal VREFBUF (2.048 V / 2.5 V / 2.9 V), they provide low-noise, low-drift buffering for ADC reference inputs. The op-amp's input offset voltage (±1.5 mV max) and GBW (10 MHz) ensure stability and accuracy across temperature.

Is the FDCAN peripheral compatible with classical CAN 2.0B frames?

Yes - FDCAN1 supports Classical CAN (CAN 2.0B) frame format in both arbitration and data phases. It also supports ISO 11898-1:2015 Flexible Data-Rate (CAN FD) with payloads up to 64 bytes and bit rates up to 5 Mbps in data phase - enabling seamless migration from legacy CAN networks.