STMicroelectronics STM32F051K4T6

Overview

STM32F051K4T6 from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller in UFQFPN32 (5 × 5 mm) package, featuring 16 KB Flash, 8 KB SRAM with hardware parity, 48 MHz max CPU frequency, one 12-bit ADC (1.0 µs conversion), one 12-bit DAC, and dual USART/I²C/SPI interfaces. It targets cost-sensitive industrial control and sensor node applications requiring low-power operation and integrated analog peripherals.

For engineers reviewing the STM32F051K4T6 datasheet, STM32F051K4T6 pinout, STM32F051K4T6 application, or STM32F051K4T6 equivalent, key selection criteria include its 16 KB Flash density, 5 V-tolerant I/O count (up to 27 pins), RTC with alarm/wakeup, SWD debug support, and ECOPACK®2 RoHS-compliant packaging.

Technical Context

The STM32F051K4T6 integrates an ARM Cortex-M0 core with Harvard architecture, supporting Thumb-2 instruction set and nested vectored interrupt controller (NVIC) for deterministic real-time response. Its memory subsystem includes 16 KB of single-cycle Flash with prefetch buffer and 8 KB of SRAM with hardware parity checking for safety-critical data integrity.

Clock management combines internal RC oscillators (8 MHz HSI, 40 kHz LSI), external crystal options (4–32 MHz HSE, 32.768 kHz LSE), and a PLL for precise 48 MHz system clock generation. Power management supports Sleep, Stop, and Standby modes with programmable voltage detector (PVD) and VBAT backup for RTC and registers.

Key Specifications

Pinout & Package

STM32F051K4T6 uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 terminals, optimized for space-constrained PCB layouts while maintaining thermal performance and manufacturability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with STM32F030F4P6 and STM32F070F6P6, the STM32F051K4T6 uniquely balances analog integration (DAC + ADC + comparators), capacitive touch support, and compact UFQFPN32 packaging-making it optimal for space-limited, mixed-signal embedded systems where both precision analog control and human interface are required.

Availability

STM32F051K4T6 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart home thermostats, motor control modules, and POS terminal peripherals requiring stable component supply across long-lifecycle production programs.

Supply support for STM32F051K4T6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM32F0 series targets cost-sensitive, resource-constrained embedded applications demanding high integration, low power, and industrial-grade reliability-especially where Cortex-M0 efficiency and ST's ecosystem support accelerate time-to-market.

FAQ

What is the maximum operating frequency and supported voltage range?

The STM32F051K4T6 operates at up to 48 MHz using its internal PLL and supports a digital supply voltage range of 2.0 V to 3.6 V. The analog supply (VDDA) must be between 2.4 V and 3.6 V and may be tied to VDD if noise requirements permit. Absolute maximum ratings specify VDD/VSS = –0.3 V to +4.0 V, but sustained operation outside 2.0–3.6 V violates specification limits.

Does this MCU support hardware debugging and programming in-system?

Yes, the STM32F051K4T6 includes a Serial Wire Debug (SWD) interface using SWDIO and SWCLK pins, enabling full in-circuit debugging, flash programming, and real-time variable inspection via standard tools like ST-LINK/V2 or compatible JTAG/SWD debuggers. No external debug header is required beyond the two dedicated SWD pins and ground.

How many I/O pins are 5 V tolerant, and what is their safe operating condition?

Up to 25 of the 27 GPIOs on the STM32F051K4T6 are 5 V tolerant when configured as inputs or outputs in push-pull mode, provided VDD is ≥ 2.0 V. This tolerance applies only when the pin is not driving high current loads and remains within absolute maximum ratings (input voltage ≤ VDD + 4.0 V). 5 V tolerance is disabled in open-drain or analog mode.

Can the internal 12-bit DAC drive external loads directly?

The integrated 12-bit DAC has a rail-to-rail output but limited drive strength (±5 mA typical). It can directly drive high-impedance loads such as op-amp inputs or reference inputs, but requires an external buffer amplifier for driving resistive loads below 5 kΩ or capacitive loads exceeding 50 pF to maintain linearity and settling time specifications.