Item specifics
Description
STM32G431KBT6 Product Overview
STM32G431KBT6 is a Cortex-M4 MCU at 170 MHz with FPU and math accelerator, LQFP-32. 128 KB Flash, 32 KB SRAM, USB 2.0 FS device (crystal-less), CAN FD, two 12-bit ADCs (5 Msps, 11 ch), two 12-bit DACs, two op-amps (PGA), two comparators, advanced motor control PWM, LP timers, RTC, 2×USART/UART, 1×SPI/I2S, 1×I2C. 26 x 5 V-tolerant I/Os. 1.7–3.6 V, -40–85 °C. Compared to the 48-pin G431CBT6, offers a smaller package with full CAN FD and USB, two op-amps, perfect for space-constrained digital power and motor control.
STM32G431KBT6 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, 11 ch), 2×12-bit DACs, 2×PGAs, 2×Comparators
Motor Control: 2×Advanced Timers (PWM/Deadtime/Brake), multiple GP/LP timers
Connectivity: USB 2.0 FS (Crystal-less), CAN FD, 2×USART/UART, 1×SPI/I2S, 1×I2C
I/Os: 26 (5 V-tolerant)
Package: LQFP-32
STM32G431KBT6 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
STM32G431KBT6 Key Advantages
128 KB Flash + 170 MHz Cortex-M4 + FPU + Math Accelerator: Large memory and blazing-fast DSP
2 Op-Amps + 2 DACs + 2 Comparators + ADC: Complete analog chain in a tiny package, saves BOM
USB 2.0 + CAN FD: High-speed USB and industrial CAN bus on one chip
26 I/Os in Ultra-Compact 32-Pin: High-density connectivity for space-constrained control
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. How does the STM32G431KBT6 differ from the STM32G474 series, and which one should I choose?
The G431 is the value‑oriented product in the G4 series. Compared to the flagship G474, it 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), while retaining the same 170 MHz Cortex‑M4 core, 128 KB dual‑bank Flash, 32 KB SRAM, and modern interfaces such as FDCAN and USB‑C. If your application does not require extremely high PWM resolution (e.g., for LLC or phase‑shifted full‑bridge converters) and has modest analog‑channel needs, the KBT6 delivers equivalent processing power at a lower cost, making it ideal for cost‑sensitive general‑purpose inverters, power tools, and industrial sensor nodes.
2. Is 128 KB of Flash sufficient? Can it run motor FOC or digital power algorithms?
128 KB of Flash can accommodate an optimized motor FOC control firmware, buck/boost converter algorithms, a CANopen slave stack, and basic safety and protection logic. It supports a dual‑bank architecture (64 KB per bank), enabling safe OTA firmware updates. If your application does not require a graphical interface or file system, 128 KB is adequate. For more space, you can upgrade to a larger‑Flash variant or use external SPI Flash for non‑volatile data.
3. What can the built‑in op‑amps and comparators actually do? Can they eliminate external analog chips?
The chip integrates two rail‑to‑rail op‑amps and two ultra‑low‑power comparators. The op‑amps can directly handle signal conditioning from current‑sense resistors or sensors, eliminating external op‑amps. The comparators are used for over‑current protection and zero‑crossing detection. 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, significantly reducing BOM cost and PCB area.
4. Does this chip support CAN FD? What advantages does it offer in industrial communication?
Yes, it integrates up to three FDCAN controllers, backward‑compatible with CAN 2.0 while supporting data rates up to 5 Mbps and payloads up to 64 bytes. Compared to classic CAN, FDCAN offers significantly higher real‑time throughput, making it ideal for industrial automation, vehicle networks, and distributed control systems.
5. What can the USB‑C interface do? Does it support Power Delivery?
The on‑chip USB‑C 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 PD protocol. For applications not requiring PD, the MCU can be powered and communicate directly over USB‑C, ideal for portable devices and USB‑powered instruments.
6. Is the LQFP‑32 package easy to solder? Is it suitable for hand assembly?
Very easy. The LQFP‑32 has all pins exposed with a generous 0.8 mm pitch, making drag‑soldering with a standard iron and flux straightforward—no hot‑air station required. The 7 mm × 7 mm size balances compactness with easy manual handling, making it a great choice for hobbyists, students, and small teams for prototyping and low‑volume production.
7. What is its power consumption like? Is it suitable for battery‑powered devices?
The STM32G4 series uses a 90 nm process with a run‑mode current of about 100 µA/MHz. It supports Sleep, Stop, and Standby low‑power modes, 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.
8. What development tools are needed, and is it compatible with the previous STM32 ecosystem?
It is fully compatible with the STM32Cube ecosystem, including the free STM32CubeMX and STM32CubeIDE, and the STM32CubeG4 firmware package. If you have previously used STM32F3 or STM32F4, a large portion of HAL code can be reused, with the main adjustments being analog‑peripheral configuration and pin mapping. For rapid prototyping, the NUCLEO‑G431KB board features the same 32‑pin package and is highly compatible with the target chip.
9. If I later need HRTIM or more analog peripherals, what upgrade options are available?
You can upgrade to LQFP‑64 or LQFP‑48 variants in the same series (e.g., STM32G474RET6), which provide the full HRTIM, five op‑amps, seven comparators, and larger Flash and SRAM. Code and hardware designs can be highly reused, minimizing migration effort. For even more computational power and graphics capability, consider the STM32H7 series.
10. Does the 128 KB Flash support dual‑bank and OTA updates? How is upgrade safety ensured?
Yes. The dual‑bank architecture allows current firmware to execute from one bank while the other is erased and programmed. After a new firmware image is downloaded and verified, a boot‑address switch completes the update. If a power loss or verification failure occurs, the system automatically rolls back, guaranteeing the device is never bricked. Combined with code readout protection (RDP) and the Memory Protection Unit (MPU), a secure remote firmware‑update scheme can be implemented.