STMicroelectronics STM32F051R4T6TR

Overview

STM32F051R4T6TR from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller in LQFP64 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, sensor nodes, and smart peripherals requiring low-voltage operation (2.0–3.6 V) and integrated analog peripherals.

For engineers reviewing the STM32F051R4T6TR datasheet, STM32F051R4T6TR pinout, STM32F051R4T6TR application, or STM32F051R4T6TR equivalent, key selection criteria include Flash size (16 KB), 64-pin LQFP package compatibility, 5 V-tolerant I/O count (up to 36), RTC with alarm, and support for capacitive touch sensing across 18 channels.

Technical Context

The device integrates an ARM Cortex-M0 core with single-cycle multiplication and hardware divide, coupled with a 32-bit AHB bus matrix enabling concurrent peripheral access. Its clock system combines internal RC oscillators (8 MHz HSI, 40 kHz LSI), external crystal support (4–32 MHz HSE, 32.768 kHz LSE), and a PLL for precise 48 MHz system clock derivation.

Power architecture includes programmable voltage detector (PVD), POR/PDR reset logic, and three low-power modes (Sleep, Stop, Standby) with RTC and backup register retention under VBAT. Analog subsystem comprises independent VDDA supply (2.4–3.6 V), temperature sensor, VREFINT reference, and dual comparators with programmable hysteresis and output routing.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant ECOPACK®2 construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F051R4T6TR, STM32F030F4P6 sacrifices analog integration and I/O count for lower cost and smaller footprint, while STM32F070F6P6 trades DAC and touch sensing for USB device capability-making the R4T6TR optimal for analog-rich, non-USB embedded control where 64-pin layout and feature completeness are prioritized.

Availability

STM32F051R4T6TR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart power outlets, motor control modules, and USB-to-UART bridge adapters requiring stable component supply and long-term manufacturability.

Supply support for STM32F051R4T6TR 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, specializing in microcontrollers, power management, and automotive ICs with strong industrial and consumer market presence.

The STM32F0 series targets cost-optimized, entry-level 32-bit applications demanding high integration, low power, and ease of development-designed specifically for replacing 8/16-bit MCUs in industrial automation, appliance control, and IoT edge devices.

FAQ

What is the maximum operating frequency and supported voltage range?

The STM32F051R4T6TR 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 can be tied to VDD if within spec. Absolute maximum ratings prohibit exceeding 4.0 V on any pin.

Does this MCU support in-circuit debugging and programming?

Yes, it supports Serial Wire Debug (SWD) via dedicated SWDIO and SWCLK pins, enabling full debugging (breakpoints, step execution, memory inspection) and flash programming without requiring a separate JTAG connector. No external debugger is needed beyond a standard SWD probe like ST-LINK/V2.

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

Up to 36 I/O pins are 5 V tolerant across GPIO ports A, B, and C. These pins safely accept input voltages up to 5.5 V regardless of VDD level (2.0–3.6 V), enabling direct connection to 5 V logic, sensors, or legacy peripherals without external level-shifting circuitry.

Is there hardware support for capacitive touch sensing, and how many electrodes does it handle?

Yes, the integrated Touch Sensing Controller (TSC) supports up to 18 capacitive sensing channels, configurable for touchkeys, linear sliders, or rotary wheels. It includes built-in charge transfer measurement, spread spectrum modulation, and noise filtering-eliminating need for external touch ICs in HMI applications.