STMicroelectronics STM32F051R4T6

Overview

STM32F051R4T6 from STMicroelectronics is a 32-bit ARM® Cortex®-M0 microcontroller with 16 KB Flash, 8 KB SRAM, 48 MHz max CPU frequency, and integrated peripherals including one 12-bit ADC (1.0 µs conversion), one 12-bit DAC, two analog comparators, and up to 55 I/Os - used in industrial sensor nodes requiring low-power operation and analog signal conditioning.

For engineers reviewing the STM32F051R4T6 datasheet, STM32F051R4T6 pinout, STM32F051R4T6 application, or STM32F051R4T6 equivalent, key selection factors include its 16 KB Flash density, LQFP64 package with 51 GPIOs, 2.0–3.6 V supply range, RTC with alarm, and dual USART/I²C/SPI interfaces for embedded control and communication.

Technical Context

The device implements an ARM Cortex-M0 core with Harvard architecture, supporting Thumb-2 instruction set and nested vectored interrupt controller (NVIC) for deterministic real-time response. It integrates a programmable voltage detector (PVD), CRC calculation unit, and hardware parity checking on SRAM for functional safety compliance.

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

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 STM32F030F4P6 and STM32F070F6P6, the STM32F051R4T6 uniquely combines 16 KB Flash, full analog subsystem (ADC+DAC+comparators+TSC), and 51 GPIOs in LQFP64 - making it optimal for space-constrained, analog-rich embedded controllers where feature density outweighs USB or extreme cost pressure.

Availability

STM32F051R4T6 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart home thermostats, motor control modules, and power tool battery management systems requiring stable component supply across multi-year production cycles.

Supply support for STM32F051R4T6 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 Cortex-M0 performance, rich analog integration, and low-power operation - optimized for industrial control, appliance HMI, and sensor edge nodes.

FAQ

What is the maximum operating frequency of the STM32F051R4T6?

The STM32F051R4T6 operates at a maximum CPU frequency of 48 MHz, achieved via its internal 8 MHz HSI oscillator with x6 PLL multiplication or external crystal up to 32 MHz. This frequency is fully supported across the entire industrial temperature range (–40°C to +85°C) and 2.0–3.6 V supply range, with all peripherals functional at full speed.

Does the STM32F051R4T6 support hardware debugging?

Yes - it includes a Serial Wire Debug (SWD) interface using SWDIO and SWCLK pins, enabling full programming, breakpoint setting, and real-time variable inspection via standard tools like ST-LINK/V2. No JTAG header is required, reducing PCB footprint and BOM count compared to legacy debug solutions.

Can the STM32F051R4T6 operate from a single 3.3 V supply?

Yes - the device operates from a single 3.3 V supply applied to both VDD and VDDA pins. The analog supply (VDDA) accepts voltages from VDD up to 3.6 V, so 3.3 V is within specification. For best ADC/DAC accuracy, separate analog and digital ground planes and proper decoupling (100 nF + 4.7 µF) on VDDA are recommended.

How many I²C interfaces does the STM32F051R4T6 support?

The STM32F051R4T6 supports up to two I²C interfaces. One supports Fast-mode Plus (1 Mbit/s) with 20 mA current sink capability and SMBus/PMBus compatibility; both support wakeup from Stop mode. These are implemented on dedicated alternate function pins (PB6/PB7 and PA9/PA10) and share no conflict with other peripherals in default configuration.