STM32G431RBT6 - 170MHz Cortex-M4 MCU 128KB Flash | ST
MPN: STM32G431RBT6 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.9 | $5.90 |
| 10 | $5.3 | $53.00 |
| 100 | $4.7 | $470.00 |
| 500 | $4.15 | $2,075.00 |
| 1,000 | $3.65 | $3,650.00 |
STM32G431RBT6 Overview
A microcontroller (MCU) is a single-chip embedded computer that integrates a processor core, memory, and peripherals such as timers, communication interfaces, and analog blocks. Within the power management and control hierarchy of an embedded system, the MCU sits at the top of the control chain, executing firmware that orchestrates sensors, actuators, and power stages. The STM32G4 Series is STMicroelectronics' mainstream general-purpose family optimized for mixed-signal and digital power applications, sitting above the entry-level STM32G0 Series and beside the higher-integration STM32G4 x4/x7 derivatives.
Key features of the STM32G431RBT6 include the 170 MHz Cortex-M4F with hardware floating-point unit and a math accelerator for control-loop acceleration, 128 KB of embedded Flash with ECC option, and a rich analog subsystem. The device integrates fast 12-bit ADCs, comparators, operational amplifiers, and a high-resolution timer, enabling direct digital control of power converters without external analog front-ends.
From an architecture standpoint, the Cortex-M4 RISC core executes Thumb-2 code with single-cycle MAC and hardware divide. ART Accelerator prefetch keeps the 170 MHz core fed from Flash. Peripheral set includes USART, SPI, I2C, CAN, and multiple advanced-control timers suitable for PWM generation in three-phase motor drives and switch-mode power supplies.
Typical applications include FOC brushless motor control, digital SMPS and PFC stages, industrial sensing and signal conditioning, and battery-powered instrumentation. The integrated op-amps and comparators reduce BOM cost in current-sensing chains.
A key design consideration is supply decoupling and VDDA/VSSA separation: keep analog and digital ground planes joined at a single point to preserve the accuracy of the 12-bit ADC under fast PWM switching.
This page synthesizes verified distributor data, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet alone.
Drop-in alternatives for STM32G431RBT6 — 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 STM32G431RBT6 (same form factor and footprint) — differing in Core, Package, SRAM, Communication Interfaces, Flash Memory.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
STM32G431RBT3
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32G431RCT6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32G431RET6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32G441RBT6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32G484RET6
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.44 / Unit
View Datasheet →STM32G431RBT6 Maximum Ratings & Electrical Characteristics
| Core | Arm Cortex-M4 32-bit with FPU |
| Max CPU Frequency | 170 MHz |
| Performance | 213 DMIPS |
| Flash Memory | 128 KB |
| SRAM | 32 KB |
| Data Bus Width | 32 bit |
| Package | LQFP-64 (10x10 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Series | STM32G4 |
STM32G431RBT6 lqfp-64 (10x10 mm) Pin Configuration Guide
Pin configuration for STM32G431RBT6 (lqfp-64 (10x10 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 STM32G431RBT6.
Refer to the datasheet for full pin configuration.
Typical Applications
STM32G431RBT6 is suitable for 6 applications: FOC Motor Control, Digital Power Conversion, Industrial Sensing and Signal Conditioning, Battery-Powered Portable Instruments, Networking and Communication Nodes, Robotics and Automation Control.
FOC Motor Control
The STM32G431RBT6 fits field-oriented control of BLDC and PMSM motors because its 170 MHz Cortex-M4F with hardware FPU executes current-loop mathematics well within a 20 kHz PWM period, and the CORDIC/FMAC math accelerator offloads Park transforms and digital filter stages from software. According to the ST datasheet feature set, fast on-chip comparators provide cycle-by-cycle over-current protection without CPU latency, while advanced-control timers generate complementary PWM with dead-time insertion. Placed between the current-sense op-amps and the gate driver, the MCU closes the FOC loop at full speed; the quantified benefit is deterministic control latency plus reduced external component count versus discrete analog control.
Recommended
Digital Power Conversion
For digital SMPS, totem-pole PFC, and LLC converters, the STM32G431RBT6 aligns with the fast loop requirements of modern switch-mode topologies. Its high-resolution PWM timer enables fine duty-cycle resolution at hundreds of kHz switching frequency, while the integrated 12-bit high-speed ADC and comparators support peak-current-mode control with hardware over-current trip. According to the ST datasheet, the CORDIC accelerator handles control-law computations efficiently. Used as the main controller between the feedback divider and the gate-driver stage, the device replaces analog PWM controllers and adds programmability; the trade-off is that firmware safety mechanisms must be validated against the analog response times they replace.
Recommended
Industrial Sensing and Signal Conditioning
The STM32G431RBT6 suits industrial sensing nodes because its rich analog subsystem integrates operational amplifiers, comparators, and fast ADCs that directly condition sensor signals such as RTD bridges and current shunts, reducing external component count. According to the ST product documentation, the 170 MHz core processes oversampled and filtered measurements while USART, SPI, I2C, and CAN interfaces transmit data to PLC or SCADA layers. The 128 KB Flash accommodates compensation tables and communication stacks. Deployed as the intelligent front-end between sensors and the industrial bus, it delivers accurate, locally processed measurements; the key benefit is single-chip signal-chain integration without a separate analog front-end IC.
Recommended
Battery-Powered Portable Instruments
For portable and battery-powered instrumentation, the STM32G431RBT6 offers a favorable performance-to-energy ratio. The Cortex-M4F completes measurement and DSP tasks quickly and then enters low-power modes, and the STM32G4 low-power run modes extend battery life in duty-cycled applications such as handheld meters and dataloggers. According to the ST datasheet, the 128 KB Flash and 32 KB SRAM support logging buffers and display drivers without external memory. In a typical handheld instrument architecture the MCU reads the analog front-end, processes readings, and drives the display and USB or UART interface; the trade-off to manage is wakeup latency versus sleep-state depth in the power budget.
Recommended
Networking and Communication Nodes
The STM32G431RBT6 serves as a protocol converter and communication node in industrial networks. Its CAN interface supports the 2.0 frames common in factory buses, and multiple USART and SPI ports bridge Modbus, DMX, and proprietary links. According to the ST product page, the 170 MHz core sustains line-rate framing and CRC computation while leaving headroom for application logic. Wired between the physical transceivers and the application layer, the MCU handles protocol translation, retries, and diagnostics in gateway designs. The concrete benefit is a single-chip gateway with deterministic interrupt latency; designs needing CAN-FD should select the pin-compatible STM32G441RBT6 instead.
Recommended
Robotics and Automation Control
In robotics and factory automation, the STM32G431RBT6 controls servo axes, stepper drivers, and actuator subsystems. Its 213 DMIPS Cortex-M4F runs multi-axis coordination firmware and its math accelerator keeps trigonometric inverse-kinematics and filter computations real time, according to the ST datasheet feature list. High-resolution PWM outputs drive gate drivers or stepper driver ICs, while quadrature encoder interfaces close position loops. Acting as the per-axis motion controller between the host automation controller and the power stage, it offloads hard-real-time tasks from higher-level systems. The quantified advantage is per-axis loop rates in the tens of kHz with hardware fault protection via integrated comparators.
Recommended
Recommended Products Summary
Engineering reference data for STM32G431RBT6 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32G431RBT3 | STM32G431RCT6 | STM32G431RET6 | STM32G441RBT6 |
|---|---|---|---|---|---|
| Package | LQFP-64 (10x10 mm) | LQFP-64 (10x10 mm) - same | LQFP-64 (10x10 mm) - same | LQFP-64 (10x10 mm) - same | LQFP-64 (10x10 mm) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Core / Frequency | Cortex-M4F, 170 MHz | Cortex-M4F, 170 MHz | Cortex-M4F, 170 MHz | Cortex-M4F, 170 MHz | Cortex-M4F, 170 MHz |
| Flash Memory | 128 KB | 128 KB | 256 KB | 256 KB | 128 KB |
| CAN Support | Classic CAN | Classic CAN | Classic CAN | Classic CAN | CAN-FD |
| Lifecycle Status | Active | Active | Active | Active | Active |
Key Differentiators
- Highest control-loop throughput in its package class (vs STM32F303-class parts)
- Flash upgrade path without PCB respin (vs STM32G431RET6)
- Honest trade-off: no CAN-FD on this variant (vs STM32G441RBT6)
Design Notes
Place 100 nF ceramic decoupling capacitors at every VDD/VSS pair of the LQFP-64 as close to the pins as possible, plus one bulk 4.7 uF to 10 uF capacitor per supply domain. Keep VDDA on a separate filtered supply (ferrite bead plus 1 uF plus 10 nF) to preserve ADC accuracy. Route the high-current PWM outputs away from analog traces and join analog and digital grounds at a single star point under the MCU. Estimated: at 170 MHz with typical peripheral loading, core current is in the tens of milliamps range per ST datasheet figures, so supply IR drop is minor if trace width is adequate.
Verify the temperature suffix before ordering: the T6 grade (-40C to +85C) is not interchangeable with T3 (-40C to +105C) in enclosure designs with hot power stages. Flash programming requires the correct VDD window per the datasheet electrical characteristics - brown-out resets during field firmware updates can brick the Flash content. Also enable the proper bootloader option bytes if UART/DFU field updates are planned; default option bytes ship with SWD-only access on many configurations.
When driving three-phase inverters, keep the MCU-side traces to gate drivers short and series-terminated (22 to 33 ohm) to control ringing at PWM edges. Use the internal comparator-based over-current trip rather than ADC polling so fault response is hardware-fast. Estimated: with 10 ns-class PWM edges on 50 mm traces, series termination suppresses reflections that would otherwise couple into the analog front-end through ground bounce. Follow ST application note guidance on STM32G4 PCB layout for motor-control boards.
Compliance Information
RoHS compliant per ST product page and distributor listings. AEC-Q100 qualification not indicated for this commercial-grade part number in the provided data; REACH and halogen-free status require confirmation from ST's official compliance documentation.
