STMicroelectronics STM32F446RET7TR

Overview

STM32F446RET7TR from STMicroelectronics is a 32-bit Arm® Cortex®-M4 microcontroller with FPU, operating up to 180 MHz (225 DMIPS), featuring 512 KB flash, 128+4 KB RAM, dual USB OTG (FS/HS), three 12-bit ADCs (7.2 MSPS in triple interleaved mode), and two 12-bit DACs. It targets high-performance industrial control, audio processing, and USB-connected embedded systems requiring real-time signal handling and rich peripheral integration.

For engineers reviewing the STM32F446RET7TR datasheet, STM32F446RET7TR pinout, STM32F446RET7TR application, or STM32F446RET7TR equivalent, key selection criteria include its 180 MHz CPU clock with ART Accelerator for zero-wait-state flash execution, dual-mode QuadSPI interface, 20 communication peripherals (including 2× CAN 2.0B, 2× SAI, SPDIF-RX), and LQFP64 package with 51 I/Os rated to 90 MHz and 5 V-tolerant capability.

Technical Context

The device integrates an Adaptive Real-Time (ART) Accelerator enabling deterministic 0-wait-state execution from flash at 180 MHz, alongside a Memory Protection Unit (MPU) and dual-bank flash architecture supporting read-while-write operations. Its clock system includes four oscillators (HSE 4–26 MHz, HSI 16 MHz ±1%, LSE 32.768 kHz, LSI) and three PLLs (main PLL, PLLI2S, PLLSAI) for independent audio and system clock domains.

Peripheral architecture features a multi-AHB bus matrix, 16-stream DMA with FIFOs and burst support, flexible external memory controller (FMC) for NOR/NAND/SDRAM, and parallel camera interface (DCMI) capable of 54 MB/s throughput. Debug infrastructure includes SWD/JTAG and Cortex-M4 Trace Macrocell™ for cycle-accurate profiling.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; 64-pin square outline, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F407VGT6, the STM32F446RET7TR adds USB HS, SAI, and QuadSPI at identical LQFP64 footprint-enabling audio and external memory expansion without board redesign. Versus STM32H743VIT6, it trades raw M7 performance for integrated USB HS PHY and lower power in Stop mode (4.3 µA vs 12 µA), simplifying USB-audio endpoint designs.

Availability

STM32F446RET7TR is available at Aetrix Electronics and suitable for industrial motor control, USB audio endpoints, smart building gateways, and portable medical devices requiring stable component supply across extended product lifecycles.

Supply support for STM32F446RET7TR 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, designing and manufacturing microcontrollers, power ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32F4 series targets high-performance embedded applications demanding real-time processing, rich connectivity, and energy efficiency-optimized for motor control, audio, and USB-enabled edge devices.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32F446RET7TR achieves 180 MHz CPU frequency using its Arm Cortex-M4 core with FPU and the Adaptive Real-Time (ART) Accelerator. This hardware prefetcher and branch cache eliminate wait states during flash execution, enabling deterministic 225 DMIPS performance without external memory or cache complexity. The HSE oscillator (4–26 MHz) feeds the main PLL to generate the system clock.

Does this MCU support USB High-Speed device mode without external components?

Yes. The STM32F446RET7TR integrates a dedicated USB 2.0 high-speed PHY with ULPI interface and on-chip full-speed PHY, allowing native USB HS device operation at 480 Mbps. No external transceiver is required-only a standard USB Type-B connector and proper PCB layout per ST's AN4879 guidelines are needed for compliance.

How many ADC channels can be simultaneously sampled at full speed?

Three independent 12-bit ADCs support up to 24 total channels. In triple interleaved mode, they achieve 7.2 MSPS aggregate sampling with hardware-synchronized triggers-enabling simultaneous acquisition of three-phase motor currents or multi-sensor arrays with sub-140 ns inter-channel skew.

What packaging and pin compatibility does the RET7TR variant offer?

The STM32F446RET7TR uses the LQFP64 (10 × 10 mm) package with 0.5 mm pitch and is pin-compatible with other STM32F446x variants in the same package, including STM32F446RCT7 and STM32F446VET6. It shares identical pinout, power, and reset configurations-allowing drop-in replacement where flash/RAM requirements align.