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STMicroelectronics STM32L031G4U6 — Microcontrollers & Processors (MCU / MPU / DSP)

STM32L031G4U6 ARM Cortex-M0+ MCU, 32 MHz, 16 KB Flash

MPNSTM32L031G4U6
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STMicroelectronics STM32L031G4U6, ARM Cortex-M0+ 32-bit MCU, 32 MHz, 16 KB Flash, 8 KB RAM, 1 KB EEPROM, 1.8V–3.6V, -40°C to 85°C, 28-UFQFPN.

$2.8100Ref. price · indicative, final on quote
STMicroelectronics STM32L031G4U6 datasheet (PDF)
Packaging28-UFQFN
RoHSROHS3 Compliant
SeriesSTM32L0
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STM32L031G4U6 specifications
ParameterValue
SeriesSTM32L0
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.8V ~ 3.6V
Operating temperature-40°C ~ 85°C (TA)
Speed32MHz
PackageTray
RAM size8K x 8
Core size32-Bit Single-Core
EEPROM size1K x 8
PeripheralsBrown-out Detect/Reset, DMA, POR, PWM, WDT
ConnectivityI²C, IrDA, LINbus, SPI, UART/USART
Number of i (O)21
Core processorARM® Cortex®-M0+
Case28-UFQFN
Data convertersA/D 10x12b
Program memory size16KB (16K x 8)

Product details

Memory budget and peripheral set

With 8 KB of RAM and 16 KB of Flash, the firmware footprint is tight — this part is sized for a single control loop, a Modbus RTU slave, or a BLE coexistence handler, not a full RTOS with a TCP/IP stack. The 1 KB EEPROM is a genuine hardware block (not emulated Flash) that survives 100k write cycles, which simplifies field-calibration and configuration storage.

The STM32L031G4U6 comes in a 28-pin UFQFPN package measuring 4 mm × 4 mm — a compact, thermally efficient land-grid array with an exposed pad for heat sinking. The 21 I/O lines are enough for a handful of sensor inputs, a serial display, and a few control outputs, but you won't have spare pins for a parallel memory bus or a large switch matrix.

Frequently asked questions

Can STM32L031G4U6 be used with a 3.3V supply?

Yes. The supply voltage range is 1.8V to 3.6V, so a 3.3V rail is well within the operating window. No external regulator is needed if your system already has a clean 3.3V supply.

What are the alternatives to STM32L031G4U6?

The STM32L151CBU6A is a functional alternative from the STM32L1 series: it uses an ARM Cortex-M3 core at the same 32 MHz clock, but offers more I/O (37 pins), dual 12-bit DACs, and USB connectivity. The trade-off is a larger package and higher active power — fit depends on your I/O count and peripheral needs.