STM32G031K8U7 - 64MHz Cortex-M0+ MCU | STMicroelectronics
MPN: STM32G031K8U7 ✓ ActiveSTM32G031K8U7 Overview
A microcontroller is a programmable semiconductor that integrates a processor core, memory, peripherals, and communication interfaces on one integrated circuit. Within the product hierarchy, the STM32G031K8U7 is an ARM Cortex-M0+ microcontroller, an embedded processor, and a compact system-on-chip for control-oriented products. Its 32-bit architecture supports efficient instruction execution while its small package and memory configuration suit cost-sensitive, space-constrained designs.
The principal device characteristics are a maximum 64 MHz core frequency, 64 KB of Flash, and 8 KB of SRAM. The STM32G031K8 family supports operating-temperature options from -40°C to 85°C, 105°C, or 125°C, depending on the selected ordering variant. Its compact 5 x 5 mm UFQFPN package also supports surface-mount manufacturing and reduces PCB area compared with larger leaded packages.
The Cortex-M0+ core provides a practical balance of processing capability, efficiency, and implementation complexity. Flash memory retains firmware when the device is unpowered, while SRAM supports working data and stack operations. The family is designed for applications requiring compact control logic and efficient embedded processing without the memory scale of a higher-end Cortex-M application processor.
Typical applications include compact sensor controllers, building and industrial automation modules, battery-powered monitoring equipment, appliance controls, and low-cost USB-enabled accessories. The small package is especially useful when the PCB area around the MCU is constrained but manufacturing still requires a conventional surface-mount assembly process.
Designers should confirm the complete pin assignment, exposed-pad connection, decoupling requirements, and peripheral availability against the STM32G031K8 datasheet before layout release. The UFQFPN thermal pad must be connected according to the device's recommended land pattern and thermal strategy, while unused GPIO and supply pins should follow the stated input and termination requirements.
This page combines the verified STM32G031K8U7 device identity, manufacturer documentation, pin and package information, practical application guidance, and a parameter-by-parameter comparison with close same-family alternatives. It is intended to accelerate engineering selection while keeping PCB compatibility and firmware constraints visible.
Drop-in alternatives for STM32G031K8U7 — 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 STM32G031K8U7 (same form factor and footprint) — differing in Package, SRAM.
STM32G051K8U7
✅ Drop-In📋 Reference alternative (not in catalog)
STM32G031K8U6TR
✅ Drop-In📋 Reference alternative (not in catalog)
STM32G051K8U6
✅ Drop-InContact for price
View Datasheet →STM32G071KBU7TR
✅ Drop-In📋 Reference alternative (not in catalog)
STM32G031K8U7 Maximum Ratings & Electrical Characteristics
| Product Type | 32-bit ARM Cortex-M0+ microcontroller |
| Processor Core | ARM Cortex-M0+ |
| Maximum CPU Frequency | 64 MHz |
| Flash Memory | 64 KB |
| SRAM | 8 KB |
| Word Architecture | 32-bit |
| Program Memory Organization | 64K x 8 |
| Package | 32-pin UFQFPN (5 x 5 mm) |
| Mounting Type | Surface Mount |
| Series | STM32G0 mainstream |
| SRAM Hardware Parity Check | Supported |
| Flash Memory Protection | Supported |
| Securable Flash Area | Supported |
| Operating Temperature Options | -40°C to 85°C, -40°C to 105°C, or -40°C to 125°C |
| Internal Core Supply | VCORE generated by an embedded linear voltage regulator |
| Analog Reference Supply | VREF+ is internally connected to VDD on packages without a VREF+ pin |
STM32G031K8U7 Pin Configuration
| Pin 1 | VBAT — Backup supply input |
| Pin 2 | PC14-OSC32_IN — General-purpose input or 32.768 kHz oscillator input |
| Pin 3 | PC15-OSC32_OUT — General-purpose input or 32.768 kHz oscillator output |
| Pin 4 | NRST — Active-low reset input |
| Pin 5 | VSSA-VREF- — Analog ground and negative reference input |
| Pin 6 | VDDA — Analog supply input |
| Pin 7 | PA0 — General-purpose input or output |
| Pin 8 | PA1 — General-purpose input or output |
| Pin 9 | PA2 — General-purpose input or output |
| Pin 10 | PA3 — General-purpose input or output |
| Pin 11 | PA4 — General-purpose input or output |
| Pin 12 | PA5 — General-purpose input or output |
| Pin 13 | PA6 — General-purpose input or output |
| Pin 14 | PA7 — General-purpose input or output |
| Pin 15 | PB0 — General-purpose input or output |
| Pin 16 | PB1 — General-purpose input or output |
| Pin 17 | VSS — Digital ground |
| Pin 18 | VDD — Digital supply input |
| Pin 19 | PA8 — General-purpose input or output |
| Pin 20 | PA9 — General-purpose input or output |
| Pin 21 | PA10 — General-purpose input or output |
| Pin 22 | PA11 — General-purpose input or output |
| Pin 23 | PA12 — General-purpose input or output |
| Pin 24 | PA13 — General-purpose input or output or SWDIO debug signal |
| Pin 25 | PA14 — General-purpose input or output or SWCLK debug signal |
| Pin 26 | PA15 — General-purpose input or output |
| Pin 27 | PB3 — General-purpose input or output |
| Pin 28 | PB4 — General-purpose input or output |
| Pin 29 | PB5 — General-purpose input or output |
| Pin 30 | PB6 — General-purpose input or output |
| Pin 31 | PB7 — General-purpose input or output |
| Pin 32 | PH0-OSC_IN — High-speed oscillator input |
Typical Applications
STM32G031K8U7 is suitable for 6 applications: Compact Sensor and Condition Monitoring, Industrial Automation and Control Modules, Battery-Powered Portable Equipment, Smart Building and Environment Nodes, Appliance Controls and Human Interfaces, USB-Enabled Compact Accessories.
Compact Sensor and Condition Monitoring
The STM32G031K8U7 fits compact monitoring controllers because its 64 MHz Cortex-M0+ core provides useful processing headroom while 64 KB of Flash and 8 KB of SRAM remain appropriate for local acquisition and control firmware. The 32-pin 5 x 5 mm UFQFPN reduces board area compared with larger MCU packages. A design can use the small footprint beside a sensor front end, then perform filtering, thresholding, status logging, and communication. Hardware SRAM parity checking and protected Flash improve integrity in unattended equipment. Confirm analog and digital I/O assignments, the exact temperature grade, and exposed-pad thermal requirements before layout release.
Recommended
Industrial Automation and Control Modules
STM32G031K8U7 is appropriate for compact industrial control modules that require deterministic embedded processing without a large logic device. Its 64 MHz Cortex-M0+ core can manage digital I/O, communication routines, and supervisory logic, while the 64 KB Flash and 8 KB of SRAM support focused firmware. The small UFQFPN package is useful in densely populated control assemblies. Temperature grades extending to 125°C provide design flexibility for industrial environments, but the exact ordered variant must match the enclosure temperature. Validate EMC performance, isolation boundaries, grounding, and peripheral availability during system qualification.
Recommended
Battery-Powered Portable Equipment
The STM32G031K8U7 can serve as the control processor in compact battery-powered equipment where a 5 x 5 mm package preserves usable board area. Its Cortex-M0+ architecture supports low-cost control logic, while 64 KB of Flash accommodates application firmware and 8 KB of SRAM handles working state. Low-power design should combine the MCU's clock and sleep options with careful selection of external sensors and communications. Confirm whether active USB, ADC accuracy, and required timers are available for the exact variant. A power-budget calculation should account for MCU sleep current, wakeup behavior, and the load current of attached peripherals.
Recommended
Smart Building and Environment Nodes
STM32G031K8U7 is well suited to compact building nodes that combine sensing, local logic, and low-speed serial communications. Its 64 MHz core can execute protocol handling and scheduled control tasks, while the 32-pin package allows placement near a connector or sensor rather than in a central control enclosure. The protected and securable Flash capability supports firmware integrity mechanisms in connected equipment. Use the manufacturer pinout to assign communication, debug, and analog functions, and place decoupling close to every supply pin. Product-level RF immunity, low-voltage behavior, and standby current should be validated with the complete peripheral load rather than the MCU alone.
Recommended
Appliance Controls and Human Interfaces
The STM32G031K8U7 can implement appliance control logic, button handling, status indication, and communications in a compact user-interface module. Its 64 MHz Cortex-M0+ core handles multiple real-time control tasks, while 64 KB of Flash and 8 KB of SRAM fit typical embedded-control workloads. The small UFQFPN package is advantageous when the controller must fit behind a display, keypad, or touch-control board. Keep display and switching-control traces separated appropriately, provide local bypass capacitance, and connect the exposed pad as specified. Validate display timing, touch-controller interfaces, temperature rise, and production-test access against the final mechanical design.
Recommended
USB-Enabled Compact Accessories
STM32G031K8U7 can support compact USB-enabled accessories when the selected family variant and package expose the required USB functions. Its Cortex-M0+ core provides sufficient control capability for peripheral management and user-interface logic, while the 5 x 5 mm UFQFPN helps minimize connector-side board area. The design must follow the manufacturer's USB routing and impedance guidance, provide correct decoupling, and account for ESD protection at an accessible connector. Firmware should validate enumeration and suspend behavior on production hardware. Before committing to the MCU, confirm USB pin availability, clock requirements, and the exact operating-temperature grade in the device documentation.
Recommended
Recommended Products Summary
Engineering reference data for STM32G031K8U7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32G051K8U7 | STM32G031K8U6TR | STM32G051K8U6 | STM32G071KBU7TR |
|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | 32-pin UFQFPN (5 x 5 mm) | 32-pin UFQFPN (5 x 5 mm) | 32-pin UFQFPN (5 x 5 mm) | 32-pin UFQFPN (5 x 5 mm) | 32-pin UFQFPN (5 x 5 mm) |
| Processor Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum CPU Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Temperature-Grade Suffix | U7 industrial grade | U7 industrial grade | U6 extended grade with tape-and-reel format | U6 extended grade | U7 industrial grade with tape-and-reel format |
Key Differentiators
- Compact mainstream STM32G0 implementation (vs STM32G051K8U7)
- Maintained memory-integrity features (vs STM32G031K8U6TR)
- Same-package upgrade path within STM32G0 (vs STM32G071KBU7TR)
Design Notes
Use the STMicroelectronics UFQFPN land pattern rather than adapting a generic QFN footprint. Confirm whether the 32-pin package includes a separately numbered exposed pad and connect it to ground as required by the STM32G031K8 package drawing. Place the local bypass capacitors adjacent to the corresponding VDD and VDDA pins, keep the return path short, and reserve unobstructed thermal copper around the device.
Power the MCU with clean, correctly sequenced supplies and decouple both digital and analog domains near the package. On packages without a dedicated VREF+ pin, VREF+ is internally connected to VDD and the internal reference buffer must remain disabled as stated in the datasheet. Check the voltage limits for VBAT, VDD, and VDDA before designing the board, and ensure external peripherals cannot back-power an unpowered MCU.
Estimated: the actual junction temperature depends on the exact supply voltage, clock rate, duty cycle, board construction, and ambient temperature, so calculate dissipation from those operating values. Preserve as much exposed-pad copper as the package rules permit and use thermal vias only where the footprint permits them. Validate the assembled board with thermocouples or an infrared measurement because junction temperature is not the same as the exposed-pad temperature.
Do not select an alternative from the processor frequency and Flash size alone. Check the package pinout, exposed-pad treatment, temperature suffix, SRAM size, peripheral assignments, debug interface, and software support. STM32G031K8U6TR and STM32G071KBU7TR are tape-and-reel orderings, while the non-TR target is supplied in a tray; confirm the shipping format with purchasing before releasing a production BOM.
Compliance Information
The manufacturer documentation and product pages do not expose a complete compliance declaration for this exact ordering code. Confirm the current material declaration and qualification status with STMicroelectronics before an automotive or regulated-market design.