STM32F031K6U6 - ARM Cortex-M0 MCU 48MHz 32KB Flash | STMicroelectronics
MPN: STM32F031K6U6 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.35 | $2.35 |
| 10 | $2.11 | $21.10 |
| 100 | $1.88 | $188.00 |
| 500 | $1.69 | $845.00 |
| 1,000 | $1.52 | $1,520.00 |
Drop-in alternatives for STM32F031K6U6 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
STM32F031K6U6TR
β Drop-Inπ Reference alternative (not in catalog)
HK32F031K6U6
β Drop-Inπ Reference alternative (not in catalog)
STM32G031K6U6
β‘ Same Packageπ Reference alternative (not in catalog)
STM32F031K6U6 Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M0 |
| Core Size | 32-Bit Single-Core |
| Speed | 48 MHz |
| Program Memory Size | 32KB (32K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 4KB |
| Number of I/O | 27 |
| Connectivity | I2C, IrDA, LINbus, SPI, UART/USART |
| Peripherals | DMA, I2S, POR, PWM, WDT |
| Number of Timers | 9 |
| ADC | 12-bit, 13 channels |
| Voltage - Supply (Vcc/Vdd) | 2.0V to 3.6V |
| Oscillator Type | Internal, External |
| Operating Temperature | -40Β°C to +85Β°C |
| Package / Case | 32-UFQFPN (5x5) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
STM32F031K6U6 Pin Configuration
| Pin 1 | VBAT β Backup battery supply |
| Pin 2 | PC14 β GPIO / OSC32_IN |
| Pin 3 | PC15 β GPIO / OSC32_OUT |
| Pin 4 | OSC_IN β External clock input |
| Pin 5 | OSC_OUT β External clock output |
| Pin 6 | NRST β Reset (active low) |
| Pin 7 | VDD β Digital power supply |
| Pin 8 | VSS β Ground |
| Pin 9 | PA0 β GPIO / ADC_IN0 |
| Pin 10 | PA1 β GPIO / ADC_IN1 |
| Pin 11 | PA2 β GPIO / USART2_TX |
| Pin 12 | PA3 β GPIO / USART2_RX |
| Pin 13 | PA4 β GPIO / SPI1_NSS |
| Pin 14 | PA5 β GPIO / SPI1_SCK |
| Pin 15 | PA6 β GPIO / SPI1_MISO |
| Pin 16 | PA7 β GPIO / SPI1_MOSI |
| Pin 17 | PB0 β GPIO / ADC_IN8 |
| Pin 18 | PB1 β GPIO / ADC_IN9 |
| Pin 19 | PB2 β GPIO / BOOT1 |
| Pin 20 | PB10 β GPIO / I2C2_SCL |
| Pin 21 | PB11 β GPIO / I2C2_SDA |
| Pin 22 | VDD β Digital power supply |
| Pin 23 | VSS β Ground |
| Pin 24 | PA13 β GPIO / SWDIO |
| Pin 25 | PA14 β GPIO / SWCLK |
| Pin 26 | PA15 β GPIO / TIM2_CH1 |
| Pin 27 | PB3 β GPIO / TIM2_CH2 |
| Pin 28 | PB4 β GPIO / TIM3_CH1 |
| Pin 29 | PB5 β GPIO / TIM3_CH2 |
| Pin 30 | PB6 β GPIO / I2C1_SCL |
| Pin 31 | PB7 β GPIO / I2C1_SDA |
| Pin 32 | VDDA β Analog power supply |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
STM32F031K6U6 is suitable for 6 applications: Industrial Control, Consumer Electronics, IoT Sensors, Motor Control, Power Management, Test and Measurement.
Industrial Control
The STM32F031K6U6 is ideal for industrial control systems such as PLCs, motor drives, and automation controllers. Its 48 MHz Cortex-M0 core provides sufficient processing power for real-time control loops, while the 12-bit ADC and advanced timers enable precise PWM generation and analog signal acquisition. The wide operating temperature range (-40Β°C to +85Β°C) ensures reliability in harsh industrial environments. With 27 I/O pins, it can interface with sensors, actuators, and communication buses like RS-485 via USART. The DMA controller offloads data transfer, improving system efficiency. Its small UFQFPN-32 package saves PCB space, making it suitable for compact industrial modules.
Recommended
Consumer Electronics
In consumer electronics, the STM32F031K6U6 serves as a cost-effective controller for appliances, remote controls, and smart home devices. Its low power consumption and multiple low-power modes extend battery life in portable devices. The integrated I2C and SPI interfaces allow easy connection to sensors, displays, and wireless modules. The 32 KB Flash is sufficient for firmware implementing user interfaces and communication protocols. The compact package enables miniaturized product designs. With support for STM32CubeMX, developers can quickly configure peripherals and generate initialization code, reducing time-to-market. The device's robust ESD protection and wide supply voltage range (2.0V-3.6V) make it suitable for battery-powered consumer products.
Recommended
IoT Sensors
The STM32F031K6U6 is well-suited for IoT sensor nodes that require low power and reliable operation. Its Cortex-M0 core efficiently handles sensor data acquisition and preprocessing, while the 12-bit ADC reads analog sensors like temperature, humidity, and light. The USART and SPI interfaces enable communication with LoRa, Zigbee, or Wi-Fi modules. The device's low-power sleep modes, combined with a real-time clock (RTC), allow periodic wake-up for data transmission, extending battery life to years. The 4 KB SRAM is adequate for buffering sensor data. The small UFQFPN package and wide temperature range make it ideal for outdoor and industrial IoT deployments. ST's low-layer APIs provide fine-grained control over power consumption.
Recommended
Motor Control
The STM32F031K6U6 is capable of driving brushless DC (BLDC) and permanent magnet synchronous motors (PMSM) using field-oriented control (FOC). Its advanced-control timer (TIM1) generates six PWM signals with complementary outputs and programmable dead-time, essential for three-phase inverters. The 12-bit ADC with up to 13 channels samples phase currents and DC bus voltage. The DMA controller transfers ADC data to memory without CPU intervention, enabling fast control loops. The 48 MHz core executes FOC algorithms with sufficient margin for moderate-speed motors. The device's small package is ideal for integrated motor drivers in drones, pumps, and fans. ST provides motor control libraries and application notes to accelerate development.
Recommended
Power Management
The STM32F031K6U6 can be used in power management systems such as smart chargers, power supplies, and battery management units. Its ADC monitors voltage and current, while the PWM timers control switching regulators. The I2C interface communicates with battery fuel gauges and chargers. The device's low power consumption is beneficial for always-on monitoring. The 32 KB Flash stores calibration data and control algorithms. The wide operating voltage range (2.0V-3.6V) allows direct operation from Li-ion batteries. The small package is suitable for space-constrained power modules. With ST's power management libraries, developers can implement efficient charging algorithms and protection features.
Recommended
Test and Measurement
The STM32F031K6U6 is used in portable test instruments like multimeters, data loggers, and signal generators. Its 12-bit ADC provides moderate resolution for voltage and current measurements, while the DMA and timers enable precise sampling. The USART and USB (via external PHY) allow data transfer to a PC. The device's low power consumption is ideal for battery-operated instruments. The 32 KB Flash stores firmware for measurement algorithms and user interface. The small package enables handheld designs. With STM32CubeMX, developers can quickly set up ADC, timer, and communication peripherals. The device's robustness and wide temperature range ensure reliable operation in field use.
Recommended
Recommended Products Summary
Engineering reference data for STM32F031K6U6 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32F031K6T6 | STM32F031K6U6TR | HK32F031K6U6 | STM32G031K6U6 |
|---|---|---|---|---|---|
| Package | UFQFPN-32 (5x5) | LQFP-32 (7x7) | UFQFPN-32 (5x5) | UFQFPN-32 (5x5) | UFQFPN-32 (5x5) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | HK Microelectronics | STMicroelectronics |
| Core | ARM Cortex-M0 | ARM Cortex-M0 | ARM Cortex-M0 | ARM Cortex-M0 | ARM Cortex-M0+ |
| Speed | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 64 MHz |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 8 KB |
| Number of I/O | 27 | 27 | 27 | 27 | 27 |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
Key Differentiators
- Cost-effective entry-level ARM Cortex-M0 MCU (vs STM32G031K6U6)
- Wide operating voltage range (2.0V-3.6V) (vs HK32F031K6U6)
- Proven reliability and long-term availability (vs HK32F031K6U6)
Design Notes
The STM32F031K6U6 operates from 2.0V to 3.6V. Decouple each VDD pin with a 100nF ceramic capacitor placed as close as possible to the pin, and add a 4.7uF bulk capacitor. The VDDA pin should be connected to a clean analog supply, ideally through a ferrite bead, to minimize ADC noise. For battery-powered designs, use the low-power modes (Sleep, Stop, Standby) to reduce current consumption.
For the UFQFPN-32 package, ensure the exposed pad is soldered to a ground plane for thermal and electrical performance. Use a 0.2mm via array under the pad for heat dissipation. Keep high-speed signals (SPI, USART) short and away from the crystal oscillator. Follow the layout guidelines in the ST application note AN4666 for optimal EMC performance.
A common pitfall is forgetting to configure the BOOT0 pin correctly. BOOT0 is multiplexed with PB2; ensure it is pulled low for normal boot from Flash. Also, the NRST pin has an internal pull-up, but an external 100nF capacitor to ground is recommended for noise immunity. When using the ADC, avoid floating analog inputs by connecting unused channels to ground.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified; for automotive, consider STM32F031K6U6Q or other automotive-grade variants.
