STMicroelectronics STM32F051K8U7TR

Overview

STM32F051K8U7TR from STMicroelectronics is an ARM® Cortex®-M0 32-bit microcontroller with 64 KB Flash, 8 KB SRAM, and integrated peripherals including a 12-bit ADC, 12-bit DAC, two USARTs (one with LIN/IrDA), two I²C interfaces (one Fast Mode Plus), and up to 36 5 V-tolerant GPIOs - deployed in industrial sensor nodes and low-power HMI control systems.

For engineers reviewing the STM32F051K8U7TR datasheet, STM32F051K8U7TR pinout, STM32F051K8U7TR application, or STM32F051K8U7TR equivalent, key selection criteria include its 48 MHz max CPU frequency, 2.0–3.6 V operating range, 16-channel 1.0 µs ADC, embedded RTC with alarm, and UFQFPN32 package thermal performance for space-constrained designs.

Technical Context

The device implements a single-cycle ARM Cortex-M0 core with Harvard bus architecture and supports Thumb-2 instruction set. It integrates a programmable voltage detector (PVD), hardware CRC unit, and nested vectored interrupt controller (NVIC) supporting up to 32 interrupts with 4 priority levels.

Clock management includes dual oscillators: a 4–32 MHz external crystal input and internal 8 MHz RC with x6 PLL for system clock generation, plus dedicated 32 kHz LSE for RTC calibration. Power management enables Sleep, Stop, and Standby modes with wake-up via GPIO, RTC alarm, or USART event.

Key Specifications

Pinout & Package

STM32F051K8U7TR uses a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN32) package, 5 × 5 mm, 0.5 mm pitch, with exposed thermal pad for enhanced heat dissipation in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F030F4P6, STM32F051K8U7TR adds DAC, TSC, and CEC-critical for HMI and consumer IR systems; versus STM32G031F8P6, it trades newer silicon advantages for mature toolchain support and broader third-party ecosystem compatibility.

Availability

STM32F051K8U7TR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart home thermostats, POS peripherals, and portable medical monitors requiring stable component supply across multi-year production cycles.

Supply support for STM32F051K8U7TR 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, low-power embedded applications requiring high integration and ARM Cortex-M0 efficiency - optimized for appliance control, HMI, and sensor edge nodes.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32F051K8U7TR achieves a maximum CPU frequency of 48 MHz using its internal 8 MHz RC oscillator multiplied by a 6× PLL. Alternatively, an external 4–32 MHz crystal can feed the PLL for higher precision timing. The system clock is distributed via AHB/APB buses with configurable prescalers to balance performance and power consumption across peripherals.

Does this MCU support hardware encryption or secure boot?

No, the STM32F051K8U7TR does not include hardware cryptographic accelerators or secure boot functionality. It lacks AES, PKA, or tamper-detection features found in later series like STM32G0 or STM32L5. Security relies on software-based methods and external trusted elements if required for certification.

Can the 12-bit DAC output drive a load directly?

The integrated 12-bit DAC has a rail-to-rail output with ±1 LSB INL but limited drive capability: max 5 mA sink/source per channel. It can directly drive high-impedance inputs (e.g., op-amp inverting input or ADC reference), but external buffering is required for loads below 10 kΩ or for precision voltage references.

What debug interface is supported and what pins are required?

The STM32F051K8U7TR supports Serial Wire Debug (SWD) using two dedicated pins: SWDIO (PA13) and SWCLK (PA14). No JTAG pins are needed. These pins are shared with GPIO and require no external pull-ups; SWD enables full flash programming, breakpoint debugging, and real-time variable inspection via standard CMSIS-DAP or ST-LINK tools.