STM32G431K6U6 - 170MHz Cortex-M4 MCU | STMicroelectronics
MPN: STM32G431K6U6 ✓ ActiveSTM32G431K6U6 Overview
A microcontroller is a programmable semiconductor that integrates a CPU, memory, peripherals, and communication interfaces on one integrated circuit. Within the embedded-device hierarchy, the STM32G431K6U6 is an Arm Cortex-M4 MCU in the STM32G4 family of 32-bit RISC microcontrollers. This category serves industrial control, motor-control, automation, sensing, and connected embedded systems where deterministic real-time performance and a compact package are important.
The device operates at 170 MHz and is identified as an Arm Cortex-M4 MCU with math-accelerator capability. Its 32 KB Flash configuration provides 32K x 8 program storage, while 32 KB of SRAM supports working memory, data buffers, and control software. Available connectivity includes CANbus, I2C, SPI, and UART, allowing the MCU to interface with sensors, actuators, transceivers, memories, and human-interface equipment.
The STM32G4 architecture combines performance-oriented Cortex-M4 processing with analog and mixed-signal capabilities suited to precision control systems. Math acceleration improves execution of control and signal-processing algorithms, while the 5 x 5 mm UFQFPN package supports compact PCB layouts. Operation from 1.8 V, 2.5 V, and 3.3 V supply levels also permits integration with common industrial and consumer system rails.
Typical applications include industrial motor controllers, digital power converters, sensor-hub equipment, building automation controllers, communication modules, and compact embedded instruments. The combination of 170 MHz processing, dedicated digital interfaces, and a small footprint is especially useful when a design must combine real-time control with several low-speed peripheral connections.
PCB design should account for the exposed pad and all VDD, VSS, VDDA, and VREF connections specified in the manufacturer pin-description table. Place decoupling capacitors close to their associated supply pins and preserve clean return paths beneath the exposed pad. Review the device's recommended oscillator, reset, and debug connections before releasing the PCB layout.
This page combines device specifications, application guidance, comparison parameters, and practical design considerations to help engineers evaluate the STM32G431K6U6 for compact embedded-control designs.
Drop-in alternatives for STM32G431K6U6 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM32G431K6U6 (same form factor and footprint) — differing in Flash Memory, Package, Product Type.
STM32G431K6U3
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32G431K8U6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32G431KBU6
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →STM32G431R6U6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32G431R6U3
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32G431K6U6 Maximum Ratings & Electrical Characteristics
| Product Type | 32-bit ARM Cortex-M4 Microcontroller |
| Core | Arm Cortex-M4 with FPU |
| Architecture | 32-bit RISC |
| Maximum CPU Frequency | 170 MHz |
| Performance | 213 DMIPS |
| Flash Memory | 32 KB (32K x 8) |
| SRAM | 32 KB |
| Math Accelerator | Yes |
| CANbus Interface | Yes |
| I2C Interface | Yes |
| SPI Interface | Yes |
| UART Interface | Yes |
| Operating Supply Voltage Options | 1.8 V, 2.5 V, or 3.3 V |
| Package | 32-pin UFQFPN (5 x 5 mm) |
| Mounting Type | Surface Mount |
| Product Series | STM32G4 |
STM32G431K6U6 32-pin ufqfpn (5 x 5 mm) Pin Configuration Guide
Pin configuration for STM32G431K6U6 (32-pin ufqfpn (5 x 5 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for STM32G431K6U6.
Refer to the datasheet for full pin configuration.
Typical Applications
STM32G431K6U6 is suitable for 6 applications: Industrial Motor Controller, Digital Power Converter, Industrial Sensor Hub, Building Automation Controller, Communication Interface Module, Precision Measurement Instrument.
Industrial Motor Controller
The STM32G431K6U6 fits compact industrial motor controllers because its 170 MHz Arm Cortex-M4 core, floating-point unit, and math accelerator support real-time control calculations within a 32-pin footprint. Its CANbus connectivity can connect the controller to a machine network, while I2C and SPI accommodate position sensors, gate drivers, and local data devices. The 32 KB SRAM provides working space for control variables and diagnostic data. Designers should preserve clean analog grounding, use the recommended exposed-pad land pattern, and verify timing against the selected motor-control algorithm.
Recommended
Digital Power Converter
The STM32G431K6U6 is suitable for digital power converters where control-loop performance and compact implementation matter. Its 170 MHz Cortex-M4 processor, FPU, and math accelerator can execute compensation and modulation routines, while CANbus, SPI, and UART support supervisory control and diagnostics. The 32 KB Flash is appropriate for compact firmware, and the 32 KB SRAM can hold control and communication buffers. Validation should include converter switching timing, DAC or PWM synchronization, thermal margins, and fault-handling behavior.
Recommended
Industrial Sensor Hub
The STM32G431K6U6 works well as an industrial sensor hub because it combines a 170 MHz Arm Cortex-M4 core with four principal communication interfaces. CANbus can aggregate field-bus measurements, I2C and SPI can connect local sensors, and UART can provide configuration or diagnostics access. Thirty-two kilobytes of SRAM can support acquisition buffers, while 32 KB Flash can hold filtering and communication firmware. The compact 5 x 5 mm UFQFPN package also helps when the sensing electronics must fit into a small enclosure.
Recommended
Building Automation Controller
The STM32G431K6U6 fits building automation controllers that coordinate sensors, actuators, and network-connected equipment. Its 170 MHz processing headroom supports protocol handling and local control, while CANbus, I2C, SPI, and UART provide flexible peripheral connectivity. The 1.8 V, 2.5 V, and 3.3 V supply options facilitate integration with common embedded rails. In a building control unit, the 5 x 5 mm package preserves PCB area, and the 32 KB SRAM supports protocol and diagnostic buffers. Firmware should include watchdog recovery and safe-state behavior.
Recommended
Communication Interface Module
The STM32G431K6U6 is appropriate for a compact communication module that bridges local sensors or equipment to a field network. The Cortex-M4 core can manage framing, filtering, diagnostics, and protocol conversion at 170 MHz, while CANbus supplies a robust industrial network connection. I2C and SPI can connect radios, storage devices, or sensor nodes, and UART supports configuration channels. The 32 KB Flash and 32 KB SRAM are suitable for modest gateway workloads. Layout planning should separate sensitive communication routes from switching nodes and maintain a low-impedance common ground.
Recommended
Precision Measurement Instrument
The STM32G431K6U6 can serve as the control processor in a compact precision measurement instrument. Its 170 MHz Cortex-M4 core with FPU and math accelerator supports calibration, filtering, and numerical calculations, while I2C and SPI connect converters, memory, and display or control peripherals. UART simplifies service and configuration access. The 32 KB SRAM can hold samples and working data, and the 32-pin 5 x 5 mm package supports miniaturized instruments. For best results, follow the manufacturer analog-supply layout, isolate sensitive inputs, and verify sampling timing and reference stability.
Recommended
Recommended Products Summary
Engineering reference data for STM32G431K6U6 — comparison, design guidance, and compliance information.
Selection Guide
Choose STM32G431K6U3 when the same memory configuration and performance are needed but the U3 temperature-grade ordering is appropriate. Choose STM32G431K8U6 when 64 KB Flash provides useful firmware headroom, or STM32G431KBU6 when 128 KB Flash is required. STM32G431R6U6 and STM32G431R6U3 provide additional same-family configuration choices where their exact resource mapping and ordering requirements meet the design.
No cross-brand drop-in candidate has been validated because firmware compatibility, peripheral mapping, and pin-level behavior must be proven rather than inferred from CPU frequency. For every same-family substitution, review the manufacturer ordering information, pin table, electrical limits, boot configuration, and temperature requirements before production release.
Comparison with Alternatives
| Parameter | This Product | STM32G431K6U3 | STM32G431K8U6 | STM32G431KBU6 | STM32G431R6U6 | STM32G431R6U3 |
|---|---|---|---|---|---|---|
| Package | 32-UFQFPN (5x5) | 32-UFQFPN (5x5) | 32-UFQFPN (5x5) | 32-UFQFPN (5x5) | 32-UFQFPN (5x5) | 32-UFQFPN (5x5) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Maximum CPU Frequency | 170 MHz | 170 MHz | 170 MHz | 170 MHz | 170 MHz | 170 MHz |
| Flash Memory | 32 KB | 32 KB | 64 KB | 128 KB | 128 KB | 128 KB |
| Temperature Grade | U6 standard grade | U3 extended grade | U6 grade | U6 grade | U6 grade | U3 extended grade |
Key Differentiators
- Compact high-performance control platform (vs STM32G431KBU6)
- Temperature-grade choice (vs STM32G431K6U3)
- Balanced memory and control capability (vs STM32G431K8U6)
Design Notes
Follow the manufacturer's UFQFPN land pattern and exposed-pad assembly recommendations. Place the required input, analog, and digital decoupling capacitors directly beside their associated pins, use short supply paths, and connect the exposed pad to the recommended ground or thermal-potential network. Confirm via count, solder-mask definition, and paste pattern with the package drawing before fabrication.
Separate analog sensing paths, digital communication routes, and power-return currents as far as the board area allows. Keep oscillator and sensitive input traces short, avoid routing switching-node traces beneath the MCU, and provide a continuous ground reference under the device. These practices reduce coupling between control signals and communication or power circuitry, particularly in motor-control and digital-power systems.
Do not select a family variant solely because it fits the same footprint. Confirm the power pins, alternate-function mapping, clock requirements, boot behavior, peripheral resources, temperature grade, firmware target, and qualification class against the manufacturer documentation. Flash-density and temperature suffix changes can alter binary images, boot configuration, and production behavior even when the mechanical package remains unchanged.
Compliance Information
No explicit compliance statement is included in the manufacturer or distributor records for this exact ordering. Confirm RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals status from the current manufacturer product documentation before qualification.