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STMicroelectronics STM32F051K8U6 — Microcontrollers & Processors (MCU / MPU / DSP)

STM32F051K8U6 ARM Cortex-M0 MCU, 48 MHz, 64 KB Flash

MPNSTM32F051K8U6
Active

STMicroelectronics STM32F051K8U6, STM32F0 series, 32-bit ARM Cortex-M0 MCU, 48 MHz, 64 KB Flash, 8 KB SRAM, 27 I/O, 2 V to 3.6 V supply, -40 to 85 °C, 32-UFQFPN (5x5 mm) exposed pad, tray.

$4.0800Ref. price · indicative, final on quote
STMicroelectronics STM32F051K8U6 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STM32F051K8U6 specifications
ParameterValue
SeriesSTM32F0
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))2V ~ 3.6V
Operating temperature-40°C~85°C(TA)
Speed48MHz
PackageTray
RAM size8K x 8
Core size32-Bit Single-Core
PeripheralsDMA, I²S, POR, PWM, WDT
ConnectivityHDMI-CEC, I²C, IrDA, LINbus, SPI, UART/USART
Number of i (O)27
Core processorARM® Cortex®-M0
Case32-UFQFN Exposed Pad
Data convertersA/D 13x12b; D/A 1x12b
Program memory size64KB (64K x 8)

Product details

The 27 I/O lines, plus peripherals including I²C, SPI, UART/USART, LIN, IrDA, and HDMI-CEC, cover most communication needs without external transceivers for short-range links.

For procurement, this removes the obsolescence risk that often drives emergency cross-shopping on older MCUs. If you are qualifying this part for a production BOM, the active status gives confidence for multi-year supply planning, though as with any single-source device, maintaining a qualified second-source alternate can hedge allocation risk.

32-UFQFPN (5x5) — footprint and thermal note

Layout engineers should connect the pad to a solid ground plane with at least four thermal vias. The 0.5 mm pitch is fine for standard SMT assembly, but the small body means the decoupling capacitor placement needs care — keep the 100 nF cap within 2 mm of the VDD/VSS pair to avoid supply bounce on the 48 MHz core.

Frequently asked questions

What are the pin-compatible replacements for STM32F051K8U6?

Within the STM32F0 family, the STM32F031K6U6 (32 KB Flash, 32 KB SRAM) and STM32F051K4U6 (16 KB Flash) share the same 32-UFQFPN (5x5 mm) package and pinout, offering lower Flash density at a lower BOM cost. The STM32F072K8U6 (128 KB Flash, 48 MHz Cortex-M0+) is also pin-compatible but adds USB 2.0 and a larger memory footprint. All share the same supply range and temperature grade, making them drop-in alternatives for dual-sourcing or cost reduction.

How to program STM32F051K8U6 using ST-Link?

The STM32F051K8U6 programs via the standard SWD (Serial Wire Debug) interface using an ST-Link/V2 or ST-Link/V3. Connect SWDIO to PA13, SWCLK to PA14, and VDD/VSS to the target's supply. The STM32CubeProgrammer or Keil/IAR IDEs handle the flash programming over SWD. No external crystal is needed for programming — the internal oscillator provides the debug clock.

Is STM32F051K8U6 suitable for 3.3V systems?

Yes. The I/O are 5 V-tolerant on most pins, but verify the specific pin groups in the datasheet for HDMI-CEC and analog inputs. The internal oscillator runs at 48 MHz without an external crystal, simplifying the 3.3 V BOM.