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STMicroelectronics STM32L051K8U3 — Microcontrollers & Processors (MCU / MPU / DSP)
STMicroelectronics

ST STM32L051K8U3 ARM Cortex-M0+ MCU, 32 MHz, 64 KB Flash

MPNSTM32L051K8U3
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ST STM32L0 series, ARM Cortex-M0+ 32-bit MCU, 32 MHz, 64 KB Flash, 8 KB RAM, 2 KB EEPROM, 1.65 V to 3.6 V, -40 to 125 °C, UFQFPN-32.

$2.1976Ref. price · indicative, final on quote
STM32L051K8U3 datasheet
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Specifications

STM32L051K8U3 Technical Specifications
ParameterValue
SeriesSTM32L0
Mounting typeSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.65V ~ 3.6V
Operating temperature-40°C ~ 125°C (TA)
Speed32MHz
PackageTray
RAM size8K x 8
Core size32-Bit Single-Core
EEPROM size2K x 8
PeripheralsBrown-out Detect/Reset, DMA, POR, PWM, WDT
ConnectivityI2C, IrDA, SPI, UART/USART
Number of i (O)27
Core processorARM® Cortex®-M0+
Case32-UFQFN Exposed Pad
Data convertersA/D 10x12b
Program memory size64KB (64K x 8)

Product details

32 MHz Cortex-M0+ in a 5×5 mm UFQFPN

The STM32L051K8U3 is a 32-bit ARM Cortex-M0+ MCU clocked at 32 MHz. It carries 64 KB Flash, 8 KB SRAM, and 2 KB EEPROM, with a 1.65 V to 3.6 V supply range.

Temperature grade and environment

Rated for -40 to 125 °C operating ambient. The 5×5 mm package with exposed pad aids thermal transfer to the PCB ground plane.

Memory and peripherals for field-update readiness

The 64 KB Flash is sized for a firmware image with a bootloader that supports in-application programming over UART or I²C. 8 KB of SRAM leaves room for moderate data buffering — enough for a small Modbus RTU slave or a sensor hub aggregating a few ADC channels. The 10-channel 12-bit ADC covers analog inputs without an external converter.

Lifecycle and sourcing reality

Frequently asked questions

What is the closest pin-compatible alternative to STM32L051K8U3?

The STM32L052K8U6 is a pin-compatible upgrade within the same STM32L0 family, adding a DAC and a few extra features while keeping the same UFQFPN-32 footprint.

What is the operating voltage of STM32L051K8U3?

The supply range is 1.65 V to 3.6 V, covering single Li-ion cell or 1.8 V logic rail operation.

Is STM32L051K8U3 compatible with STM32L031K6?

The STM32L031K6 is a lower-density sibling (32 KB Flash, 8 KB RAM) in the same STM32L0 family and same UFQFPN-32 package, so it is pin-compatible for a cost-reduced or lower-memory BOM variant.