STMicroelectronics STM32F051K6U6TR

Overview

STM32F051K6U6TR from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller in UFQFPN32 (5 × 5 mm) package, featuring 32 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 STM32F051K6U6TR datasheet, STM32F051K6U6TR pinout, STM32F051K6U6TR application, or STM32F051K6U6TR equivalent, key selection criteria include its 32-pin UFQFPN package, 32 KB Flash/8 KB SRAM memory configuration, 12-bit ADC + DAC co-integration, 5 V-tolerant I/O capability on up to 36 pins, and support for Stop/Standby low-power modes with RTC wakeup.

Technical Context

The STM32F051K6U6TR implements an ARM Cortex-M0 core with Harvard architecture, supporting Thumb-2 instruction set and nested vectored interrupt controller (NVIC) with 32 interrupts. Its clock system integrates multiple sources: 4–32 MHz HSE crystal, 32 kHz LSE for RTC, 8 MHz HSI with PLL (×6), and 40 kHz LSI for watchdog timing.

Peripheral integration includes a 7-channel DMA controller, advanced-control timer (TIM1) with deadtime generation and emergency stop, and capacitive touch sensing (up to 18 channels). Analog subsystem comprises temperature sensor, VREFINT reference, and VBAT monitoring - all calibrated at factory and accessible via dedicated registers.

Key Specifications

Pinout & Package

STM32F051K6U6TR uses the UFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 terminals. Pin assignments are validated per STMicroelectronics DocID022265 Rev 7, Section 4 (Pinouts and pin descriptions), Table 13 (Pin definitions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F030F4P6 and STM32F070F6P6, the STM32F051K6U6TR uniquely combines 32 KB Flash, integrated DAC, capacitive touch, and advanced PWM in a 32-pin compact package - making it the only option among the three supporting closed-loop analog control with human interface in space-constrained designs.

Availability

STM32F051K6U6TR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC actuators, USB-C power monitors, and POS peripheral controllers requiring stable component supply across multi-year production cycles.

Supply support for STM32F051K6U6TR 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 management ICs, MEMS, and automotive-grade components since 1987.

The STM32F0 series targets cost-sensitive, low-power embedded applications requiring ARM Cortex-M0 performance with rich analog integration - optimized for industrial automation, appliance control, and IoT edge nodes.

FAQ

What is the maximum operating frequency and supply voltage range for STM32F051K6U6TR?

The STM32F051K6U6TR operates at up to 48 MHz CPU frequency with a digital supply range of 2.0–3.6 V (VDD) and analog supply (VDDA) from VDD up to 3.6 V. It includes a programmable voltage detector (PVD) with thresholds from 2.2 V to 2.9 V, enabling reliable brown-out detection across the full operating range.

Does STM32F051K6U6TR support in-system programming and debug without external hardware?

Yes - it features Serial Wire Debug (SWD) with SWDIO and SWCLK pins, allowing full programming, debugging, and real-time trace via a 2-pin interface. No external debugger chip is required; standard ST-LINK/V2 or compatible probes suffice. The device also supports bootloader activation via BOOT0 pin for UART-based firmware updates.

How many I/O pins are 5 V tolerant, and which packages support them?

Up to 36 I/O pins are 5 V tolerant, including all GPIOs on the UFQFPN32 package used by STM32F051K6U6TR. This tolerance applies regardless of VDD level (2.0–3.6 V), enabling direct connection to 5 V sensors, displays, and logic without level-shifting circuitry - confirmed in Section 3.7 and Table 48 of the official datasheet.

What low-power modes are available, and what is the typical current draw in Standby mode?

The device supports Sleep, Stop, and Standby modes. In Standby mode with RTC enabled and VBAT supplied, typical current consumption is 0.47 µA at 25 °C (measured per Section 6.3.27). Wakeup occurs via RTC alarm, external interrupt, or I²C address match - enabling multi-year battery life in metering and sensor applications.