STM32L031K6T6 - Ultra-Low-Power ARM Cortex-M0+ MCU | STMicroelectronics
MPN: STM32L031K6T6 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.82 | $1,820.00 |
Drop-in alternatives for STM32L031K6T6 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:
STM32L031K4T6
β Drop-Inπ Reference alternative (not in catalog)
STM32L031K8T6
β Drop-Inπ Reference alternative (not in catalog)
STM32L051K6T6
β Drop-Inπ Reference alternative (not in catalog)
STM32L071K6T6
β Drop-Inπ Reference alternative (not in catalog)
STM32L031K6T6 Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0+ |
| Max Clock Speed | 32 MHz |
| Flash Memory | 32 KB |
| SRAM | 8 KB |
| Supply Voltage | 1.8 V to 3.6 V |
| Operating Temperature | -40C to +85C |
| Package | LQFP-32 (7x7 mm) |
| Mounting Type | Surface Mount |
| ADC | 12-bit, 1.14 Msps, with hardware oversampling |
| DAC | 12-bit |
| Comparators | 2 |
| Timers | 5 (including 1 low-power timer) |
| Communication Interfaces | I2C, SPI, USART |
| GPIO | Up to 25 |
| Low-Power Modes | Sleep, Low-power run, Low-power sleep, Stop, Standby |
| Standby Current | 0.29 uA (with RTC) |
| Run Current | 84 uA/MHz |
| RoHS Status | Compliant |
STM32L031K6T6 Pin Configuration
| Pin 1 | VBAT β Battery backup supply for RTC |
| 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 / DAC_OUT1 |
| 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 | PB12 β GPIO / SPI2_NSS |
| Pin 23 | PB13 β GPIO / SPI2_SCK |
| Pin 24 | PB14 β GPIO / SPI2_MISO |
| Pin 25 | PB15 β GPIO / SPI2_MOSI |
| Pin 26 | PA8 β GPIO / MCO |
| Pin 27 | PA9 β GPIO / USART1_TX |
| Pin 28 | PA10 β GPIO / USART1_RX |
| Pin 29 | PA11 β GPIO / USART1_CTS |
| Pin 30 | PA12 β GPIO / USART1_RTS |
| Pin 31 | PA13 β GPIO / SWDIO |
| Pin 32 | PA14 β GPIO / SWCLK |
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
STM32L031K6T6 is suitable for 6 applications: Wearable Health Monitor, Smart Sensor Node, Portable Medical Device, Industrial Monitoring System, IoT Edge Node, Battery Management System.
Wearable Health Monitor
The STM32L031K6T6 is ideal for wearable health monitors due to its ultra-low power consumption (84 uA/MHz in Run mode, 0.29 uA in Standby) and integrated analog peripherals. It can interface with biosensors (e.g., heart rate, temperature) via I2C or SPI, process data with the Cortex-M0+ core, and communicate via BLE through an external module. The 12-bit ADC with oversampling enables precise signal acquisition, while the low-power modes extend battery life to months. Designers can use the STOP mode with RTC to periodically wake the device for measurements, minimizing energy usage. The LQFP-32 package is compact enough for small form-factor PCBs, and the wide supply voltage range (1.8V-3.6V) allows direct coin-cell battery operation.
Recommended
Smart Sensor Node
In industrial IoT and smart agriculture, the STM32L031K6T6 serves as a low-power sensor node controller. Its multiple communication interfaces (I2C, SPI, USART) allow connection to various sensors (temperature, humidity, pressure) and wireless modules (LoRa, Sigfox). The device's low-power modes enable battery-powered operation for years, with the ability to wake on external interrupts or RTC alarms. The 12-bit ADC and comparators can be used for threshold-based sensing, reducing processor wake-ups. The STM32L031K6T6's robust operating temperature range (-40C to +85C) suits outdoor environments. Designers can leverage the hardware oversampling to improve ADC resolution for accurate measurements, and the flexible clocking system allows optimization between speed and power.
Recommended
Portable Medical Device
The STM32L031K6T6 is well-suited for portable medical devices like glucose meters and pulse oximeters. Its ultra-low power consumption ensures long battery life, critical for patient convenience. The integrated 12-bit DAC and comparators enable analog signal conditioning, while the ADC with oversampling provides high-resolution measurements. The device's small LQFP-32 package allows compact PCB designs, and the wide supply voltage range accommodates various battery chemistries. In a typical glucose meter, the MCU reads the sensor via ADC, processes the data, and displays results on an LCD or sends via UART to a smartphone. The low-power modes allow the device to remain in standby between measurements, drawing only microamps.
Recommended
Industrial Monitoring System
The STM32L031K6T6 can be used in industrial monitoring systems for data acquisition and control. Its robust operating temperature range and wide supply voltage make it suitable for harsh environments. The device's multiple timers and communication interfaces enable interfacing with industrial sensors and actuators. The 12-bit ADC can sample analog signals from pressure or temperature transducers, and the USART can communicate with a central PLC or gateway. The low-power modes are beneficial for battery-backed monitoring stations. Designers can use the low-power timer to periodically wake the system for measurements, reducing energy consumption. The STM32L031K6T6's rich peripheral set allows for a compact, cost-effective design.
Recommended
IoT Edge Node
The STM32L031K6T6 is an excellent choice for IoT edge nodes that require local processing and low power. It can collect data from sensors, perform basic processing, and transmit via a wireless module. The device's ultra-low-power modes allow battery-powered operation for extended periods. The communication interfaces (I2C, SPI, USART) enable connection to various sensors and radios. The 12-bit ADC is useful for reading analog sensors, and the comparators can be used for wake-up on threshold events. The STM32L031K6T6's small package and low cost make it ideal for mass-deployed IoT devices. Designers can use the STOP mode with RTC to schedule periodic transmissions, minimizing power consumption.
Recommended
Battery Management System
The STM32L031K6T6 can be used in battery management systems (BMS) for monitoring and protection. Its low-power operation is crucial for minimizing self-discharge of the battery pack. The 12-bit ADC can measure cell voltages and currents, while the comparators can trigger protection interrupts on overvoltage or undervoltage. The device's communication interfaces allow reporting to a host controller. The wide supply voltage range (1.8V-3.6V) is compatible with typical battery voltages. The STM32L031K6T6's low-power modes enable the BMS to remain in standby when not actively monitoring, extending battery life. The LQFP-32 package is suitable for compact BMS PCBs.
Recommended
Recommended Products Summary
Engineering reference data for STM32L031K6T6 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32L031K4T6 | STM32L031K8T6 | STM32L051K6T6 | STM32L071K6T6 |
|---|---|---|---|---|---|
| Package | LQFP-32 | LQFP-32 | LQFP-32 | LQFP-32 | LQFP-32 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Flash Memory | 32 KB | 16 KB | 64 KB | 32 KB | 192 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 20 KB |
| Max Clock Speed | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| Standby Current | 0.29 uA | 0.29 uA | 0.29 uA | 0.29 uA | 0.29 uA |
| True EEPROM | No | No | No | Yes | Yes |
Key Differentiators
- Ultra-low standby current of 0.29 uA with RTC (vs STM32L051K6T6)
- 32 KB Flash in a cost-optimized package (vs STM32L031K4T6)
- Pin-compatible with higher-memory variants (vs STM32L031K8T6)
Design Notes
For ultra-low-power operation, use the STOP mode with RTC to achieve 0.29 uA standby current. Ensure all unused GPIOs are configured as analog inputs to prevent leakage. Decouple each VDD pin with a 100nF capacitor and add a 1uF capacitor on the main supply. Use the internal 16 MHz RC oscillator for fast wake-up, or an external 32.768 kHz crystal for accurate RTC timing.
Place the decoupling capacitors as close as possible to the VDD and VDDA pins. For the LQFP-32 package, ensure a solid ground plane under the device. If using the ADC, separate analog and digital ground planes and connect them at a single point. Keep the crystal oscillator traces short and shielded to avoid noise coupling.
Do not exceed the absolute maximum ratings: supply voltage 3.6V and input voltage on any pin up to VDD+0.3V. When programming the Flash, ensure the supply voltage is within the specified range (2.0V-3.6V for write/erase). Also, be aware that the BOOT0 pin (PB2) must be pulled low for normal boot from Flash; a floating BOOT0 can cause unexpected boot behavior.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified; for automotive, consider STM32L0 series with -Q suffix.
