STMicroelectronics STM32F051K4T6TR

Overview

STM32F051K4T6TR 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 USARTs with LIN/IrDA support. It targets cost-sensitive industrial control and sensor interface applications requiring low-power operation and integrated analog peripherals.

For engineers reviewing the STM32F051K4T6TR datasheet, STM32F051K4T6TR pinout, STM32F051K4T6TR application, or STM32F051K4T6TR equivalent, key selection criteria include its 32-pin UFQFPN footprint, 5 V-tolerant I/O count (up to 27), RTC with alarm/wakeup, HDMI CEC interface, and SWD debug support - all confirmed in ST's production data DocID022265 Rev 7.

Technical Context

The device implements a single-cycle ARM Cortex-M0 core with Thumb-2 instruction set, supporting up to 48 MHz via internal 8 MHz RC + x6 PLL or external 4–32 MHz crystal. Its memory subsystem includes 16 KB of Flash with error correction and 8 KB of SRAM with hardware parity checking for safety-critical operation.

Power architecture integrates programmable voltage detector (PVD), POR/PDR reset logic, and three low-power modes (Sleep, Stop, Standby) with VBAT backup for RTC and registers. Clock tree supports dual oscillators: 32 kHz LSE for RTC calibration and 40 kHz LSI for watchdog timing.

Key Specifications

Pinout & Package

STM32F051K4T6TR uses a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN32) package, 5 × 5 mm, 0.5 mm pitch, with exposed thermal pad. Pinout conforms to ST's official pin definition table (Section 4, DocID022265 Rev 7), validated for this specific variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F051K4T6TR, STM32F030F4P6 sacrifices analog features for lower cost and smaller footprint, while STM32F070F6P6 trades ADC/DAC for USB - making the K4T6TR optimal for mixed-signal edge nodes needing both precision analog I/O and compact packaging.

Availability

STM32F051K4T6TR 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 and long-term manufacturability.

Supply support for STM32F051K4T6TR 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 automotive ICs since 1987.

The STM32F0 series targets cost-sensitive, resource-constrained embedded applications, emphasizing low-power operation, integrated analog peripherals, and rapid development with STM32Cube ecosystem support.

FAQ

What is the maximum operating frequency and supported clock sources for STM32F051K4T6TR?

The STM32F051K4T6TR operates at up to 48 MHz using its internal 8 MHz RC oscillator with PLL multiplication, or an external 4–32 MHz crystal oscillator. It also supports 32 kHz LSE for RTC and 40 kHz LSI for watchdog timing - all verified in electrical characteristics tables (Sections 6.3.7–6.3.9 of DocID022265 Rev 7).

Does STM32F051K4T6TR support 5 V tolerant I/Os, and how many are available?

Yes, STM32F051K4T6TR supports 5 V tolerant I/Os on up to 25 pins (PA0–PA3, PA7–PA15, PB0–PB11), as specified in Section 6.3.14 (I/O port characteristics) and Table 13 (Pin definitions) of the datasheet. This enables direct interfacing with 5 V peripherals without external level shifters.

What debug interface does STM32F051K4T6TR provide, and what pins are required?

STM32F051K4T6TR uses Serial Wire Debug (SWD), requiring only two pins: SWDIO (PA13) and SWCLK (PA14). No JTAG header is needed, reducing PCB footprint and simplifying debug probe connection - confirmed in Section 3.20 and pin description tables.

Is there hardware support for capacitive touch sensing, and how many channels are usable in UFQFPN32 package?

Yes, the device integrates a dedicated Touch Sensing Controller (TSC) supporting up to 18 channels. In the UFQFPN32 package, 16 GPIOs are assigned to TSC functionality (PA0–PA7, PB0–PB7), enabling full implementation of touchkey or linear slider interfaces without external components.