STM32G031K6U6 - 64MHz Cortex-M0+ 32KB MCU | STMicroelectronics
MPN: STM32G031K6U6 ✓ ActiveSTM32G031K6U6 Overview
A microcontroller is a programmable semiconductor that combines a CPU core, memory, and peripherals in one integrated circuit. The STM32G0 family sits within the broader embedded-controller and power-management hierarchy. The Cortex-M0+ core uses a compact 32-bit RISC architecture intended for cost-sensitive embedded products, while the STM32G031K6U6 adds enough Flash and SRAM for control logic, serial communications, and modest real-time processing.
The device operates at up to 64 MHz and includes 32 KB of Flash and 8 KB of RAM. Two USART interfaces support serial links to sensors, modules, human-interface equipment, and debug or programming accessories. The available timer and ADC resources make it suitable for converting analog measurements into digital control data, generating timing signals, and operating actuators. Its 32-pin UFQFPN package supports compact surface-mount designs.
The STM32G031K6U6 uses an Arm Cortex-M0+ processor with 32-bit RISC characteristics and operates from a 1.7 V to 3.6 V supply. This combination provides useful processing performance without requiring a larger package or a more complex MCU architecture. The 8 KB SRAM is sufficient for control buffers and stack-intensive embedded routines, while the 32 KB Flash supports firmware, configuration data, and a boot program.
Typical applications include compact industrial controllers, sensor-hub boards, serial data concentrators, LED-control systems, and small motor-control products. Two USARTs allow simultaneous connections to local modules or external instrumentation, while the ADC and timers support analog monitoring and deterministic timing tasks. The 5 x 5 mm package also helps reduce board area in densely populated embedded products.
Designers should verify the exact pin multiplexing, debug interface, clock configuration, and peripheral electrical limits against the official STM32G031K6 datasheet before layout. Decoupling, exposed-pad implementation, boot configuration, and programming access are critical in a compact QFN design. Firmware migration should also be checked because equivalent-looking MCU order codes can differ in Flash size, temperature grade, or peripheral configuration.
This page consolidates verified distributor pricing, manufacturer specifications, package details, drop-in family alternatives, and practical replacement guidance. It distinguishes confirmed STM32G031K6U6 data from parameters that still require confirmation from the manufacturer datasheet, helping engineers select, compare, and source the MCU with fewer procurement and design errors.
Drop-in alternatives for STM32G031K6U6 — 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 STM32G031K6U6 (same form factor and footprint) — differing in Flash Memory, Package, Product Type, Timers.
STM32G031K8U6
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →STM32G031J6U6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32G031G6U6
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →STM32G071K6U6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32G071J6U6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32G031K6U6 Maximum Ratings & Electrical Characteristics
| Product Type | 32-bit ARM Cortex-M0+ Microcontroller |
| Maximum CPU Frequency | 64 MHz |
| Core Architecture | Arm Cortex-M0+ 32-bit RISC |
| Flash Memory | 32 KB (32K x 8) |
| RAM | 8 KB |
| Operating Supply Voltage Range | 1.7 V to 3.6 V |
| Package | 32-UFQFPN (5 mm x 5 mm) |
| Number of Pins | 32 pins |
| Mounting Type | Surface Mount |
| USART Count | 2 |
| ADC | Present |
| Timers | Present |
| Communication Interfaces | Present |
| Product Series | STM32G0 Series |
STM32G031K6U6 32-ufqfpn (5 mm x 5 mm) Pin Configuration Guide
Pin configuration for STM32G031K6U6 (32-ufqfpn (5 mm 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 STM32G031K6U6.
Refer to the datasheet for full pin configuration.
Typical Applications
STM32G031K6U6 is suitable for 6 applications: Compact Industrial Control Modules, Sensor Hubs and IoT Gateways, Serial Data Concentrators, LED Lighting and Signage Controllers, Battery-Powered Monitoring Products, Small Motor and Actuator Controllers.
Compact Industrial Control Modules
The STM32G031K6U6 fits compact industrial control modules because its 64 MHz Arm Cortex-M0+ core provides responsive task execution while its 32 KB Flash and 8 KB RAM accommodate control firmware, state, and serial buffers. Two USARTs can connect a local controller to sensors or service modules without requiring larger packages. The 32-pin UFQFPN 5 x 5 mm footprint preserves board area for compact PLC, relay-control, and machine-interface products. Designers should verify the exact peripheral mix, timer resources, and operating-temperature grade for each production order code.
Recommended
Sensor Hubs and IoT Gateways
The STM32G031K6U6 is useful in sensor hubs and small IoT gateways where local processing must coexist with limited board area. Its 64 MHz Cortex-M0+ core can execute acquisition, filtering, and protocol-state tasks, while the ADC supports analog sensor interfaces. The two USARTs provide channels for external sensors or radio and communications modules. With 8 KB RAM and 32 KB Flash, the MCU suits compact aggregation products rather than graphics-heavy gateways. Firmware should be sized carefully, and the exact communication-interface configuration should be confirmed in the manufacturer documentation.
Recommended
Serial Data Concentrators
The STM32G031K6U6 supports serial data concentrators because two USARTs allow simultaneous connection to two field buses, meters, or service interfaces. The 64 MHz Cortex-M0+ processor can frame incoming data, apply local commands, and forward status information, while 8 KB RAM accommodates transient receive buffers. Its small 32-pin UFQFPN package is advantageous in DIN-rail, panel, and inline data-conversion products. Engineer the implementation around the device's documented electrical limits, peripheral clock requirements, and selected serial levels rather than assuming every UART pin is available for every alternate function.
Recommended
LED Lighting and Signage Controllers
The STM32G031K6U6 is appropriate for compact LED-lighting and signage controllers where timer-driven updates, serial configuration, and low board area matter. The 64 MHz core can coordinate dimming patterns and status logic, and the two USARTs support configuration links or multi-panel communication. The 32 KB Flash stores effects and configuration data, while the 5 x 5 mm UFQFPN package helps reduce controller size. LED drive current should be handled by suitable external drivers rather than the MCU pins, and designers should confirm timer outputs, PWM capability, and thermal conditions for the selected order code.
Recommended
Battery-Powered Monitoring Products
The STM32G031K6U6 fits small battery-powered monitoring products because it combines a 1.7 V to 3.6 V operating range with an 8 KB RAM and 32 KB Flash in a compact surface-mount package. A low-power monitoring design can use the ADC for battery or environmental sensing, timers for scheduled measurement, and a USART for configuration or telemetry. The MCU is not itself a complete power-management solution, so battery regulation, load switches, and protection components must be designed separately. Verify low-power modes, wake-up sources, and ADC accuracy in the official datasheet before finalizing battery life estimates.
Recommended
Small Motor and Actuator Controllers
The STM32G031K6U6 can manage low-power motor and actuator control tasks when its timers, ADC, and communication interfaces meet the design requirements. The 64 MHz Cortex-M0+ core supports closed-loop sequencing, current or position feedback handling, and host communications, while the two USARTs enable diagnostics or command input. Its 32-pin UFQFPN package is useful in compact appliance, valve, and small-drive products. The MCU should command external transistor or driver circuitry rather than carry motor current directly; switching losses, inductive transients, thermal limits, and protection require separate hardware design.
Recommended
Recommended Products Summary
Engineering reference data for STM32G031K6U6 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32G031K8U6 | STM32G031J6U6 | STM32G031G6U6 | STM32G071K6U6 | STM32G071J6U6 |
|---|---|---|---|---|---|---|
| Package | 32-UFQFPN (5 mm x 5 mm) | 32-UFQFPN (5 mm x 5 mm) | 32-UFQFPN (5 mm x 5 mm) | 32-UFQFPN (5 mm x 5 mm) | 32-UFQFPN (5 mm x 5 mm) | 32-UFQFPN (5 mm x 5 mm) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| CPU Core | Arm Cortex-M0+ 32-bit RISC | Arm Cortex-M0+ 32-bit RISC | Arm Cortex-M0+ 32-bit RISC | Arm Cortex-M0+ 32-bit RISC | Arm Cortex-M0+ 32-bit RISC | Arm Cortex-M0+ 32-bit RISC |
| Maximum Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Flash Memory | 32 KB | 64 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| RAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| Operating Supply Voltage Range | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V |
| ADC | Present | Present | Present | Present | Present | Present |
| Communication Interfaces | Present | Present | Present | Present | Present | Present |
Key Differentiators
- Exact 32 KB Flash configuration with compact footprint (vs STM32G031K8U6)
- Compact 32-pin 5 x 5 mm surface-mount package (vs STM32G071J6U6)
- Documented dual-USART connectivity (vs STM32G031K8U6)
Design Notes
The STM32G031K6U6 operates from 1.7 V to 3.6 V, so the power tree must remain within that range under startup, load, and transient conditions. Place the required input and bulk capacitors close to the supply pins, follow the manufacturer's recommended values, and include local bypass for every supported supply rail. Confirm whether unused supply and ground pins must be connected according to the package drawing before committing the layout.
The 32-pin UFQFPN 5 x 5 mm package requires careful exposed-pad handling. Implement the manufacturer's land pattern with the prescribed thermal pad, solder-mask policy, and paste geometry, and maintain adequate copper for current and heat spreading. Because the verified search data does not expose the complete pin table or recommended PCB footprint, engineers must use the official package drawing and land-pattern guidance rather than scaling dimensions from a generic QFN footprint.
Route the 64 MHz clock and sensitive analog ADC inputs away from high-current switching nodes and digital return paths. Keep the MCU ground and decoupling current paths compact, use a continuous ground reference under the device where appropriate, and separate noisy motor or relay return currents from ADC references. Verify alternate-function assignments because multiplexed pins can change the required routing and affect whether a proposed board-level substitution is truly pin compatible.
Do not treat a matching QFN footprint as proof of a drop-in replacement. Confirm the exact pin names, exposed-pad connection, boot configuration, debug pins, ADC functions, timer channels, USART mapping, voltage limits, and clock tree for the replacement order code. Firmware built for the STM32G031K6U6 must also be recompiled and regression tested, particularly when moving between G031 and G071 variants with different peripheral configurations.
Compliance Information
The supplied verified snippets do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is marked not_applicable because this product is a general-purpose MCU rather than an explicitly automotive-qualified order code in the provided data.
