STMicroelectronics STM32F051K8U7

Overview

STM32F051K8U7 from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller with 64 KB Flash, 8 KB SRAM, 48 MHz max CPU frequency, 12-bit ADC (1.0 µs conversion), and 12-bit DAC-designed for cost-sensitive industrial control, sensor interface, and smart actuator applications requiring integrated analog peripherals and low-power operation.

For engineers reviewing the STM32F051K8U7 datasheet, STM32F051K8U7 pinout, STM32F051K8U7 application, or STM32F051K8U7 equivalent, key selection factors include its 48-pin UFQFPN package, 5 V-tolerant I/Os (up to 36), dual USARTs with IrDA/LIN support, two I²C interfaces (one Fast Mode Plus), and hardware CRC unit for firmware integrity verification.

Technical Context

The STM32F051K8U7 implements an ARM Cortex-M0 core with Harvard bus architecture, supporting Thumb-2 instruction set and nested vectored interrupt controller (NVIC) with up to 32 interrupts. It integrates a programmable voltage detector (PVD), hardware parity checking on SRAM, and boot-from-Flash/SYSMEM/option-byte-configurable memory mapping.

Clock management includes dual oscillators: 4–32 MHz external crystal (HSE) and 32 kHz LSE for RTC, plus internal RC sources (8 MHz HSI with PLL, 40 kHz LSI). Power management supports Sleep, Stop, and Standby modes with VBAT backup for RTC and registers.

Key Specifications

Pinout & Package

STM32F051K8U7 is housed in a 48-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN) package, 7 mm × 7 mm, 0.5 mm pitch, with exposed thermal pad for enhanced power 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 and STM32F070F6P6, the STM32F051K8U7 delivers higher analog integration (DAC + 16-channel ADC + TSC), larger memory, and richer timer/peripheral set-making it optimal for applications demanding mixed-signal processing within tight board space.

Availability

STM32F051K8U7 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart actuators, low-power IoT endpoints, and consumer electronics remote interfaces requiring stable component supply across production lifecycles.

Supply support for STM32F051K8U7 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 requiring ARM Cortex-M0 performance with rich analog and timing peripherals-optimized for rapid development and long-term manufacturability.

FAQ

What is the maximum operating frequency and corresponding supply voltage range?

The STM32F051K8U7 operates at up to 48 MHz when supplied with 2.4–3.6 V on VDD. At lower voltages (2.0–2.4 V), the maximum frequency is reduced to 24 MHz per datasheet Section 6.3.1. This voltage-frequency scaling ensures reliable operation across industrial temperature ranges (–40°C to +85°C) and enables dynamic power optimization.

Does STM32F051K8U7 support hardware debug and programming interfaces?

Yes-it includes Serial Wire Debug (SWD) interface using SWCLK and SWDIO pins (PA14/PA13), supporting full JTAG/SWD debugging, flash programming, and real-time variable inspection via standard tools like ST-LINK/V2. No external debugger hardware is required beyond the SWD connector.

How many I/O pins are 5 V tolerant, and which ones?

Up to 36 I/Os are 5 V tolerant, including all pins on GPIOA, GPIOB, and GPIOF except PA11, PA12, and PF1. Tolerance applies only when VDD ≥ 2.0 V; pins must not be driven above VDD + 4 V. Full listing is in Table 13 (Pin Definitions) of the datasheet, confirmed for UFQFPN48 package.

Is the internal 8 MHz RC oscillator factory-calibrated, and what is its accuracy?

Yes-the HSI 8 MHz RC oscillator is factory-trimmed to ±1% accuracy at 25°C and 3.3 V. Over full temperature (–40°C to +85°C) and voltage (2.0–3.6 V) ranges, typical variation is ±2.5%, making it suitable for non-critical timing (e.g., UART baud generation with auto-baud detection) but not for USB or precise RTC.