STMicroelectronics STM32F446VET6

Overview

STM32F446VET6 from STMicroelectronics is a 32-bit Arm® Cortex®-M4 microcontroller with FPU, operating at 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 STM32F446VET6 datasheet, STM32F446VET6 pinout, STM32F446VET6 application, or STM32F446VET6 equivalent, key selection factors include its 180 MHz Cortex-M4+FPU core, dual USB OTG support with dedicated DMA, 114 GPIOs (112 5 V-tolerant), 20 communication interfaces including dual CAN 2.0B and SAI, and flexible memory expansion via FMC and QuadSPI.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from flash at 180 MHz, alongside a Memory Protection Unit (MPU) for secure task isolation. Its multi-AHB bus matrix supports concurrent access to flash, SRAM, and peripherals without contention.

Timing architecture includes three independent PLLs - main PLL, audio PLL (PLLI2S), and SAI PLL (PLLSAI) - enabling simultaneous high-fidelity audio clocking (e.g., 44.1/48 kHz I²S) and system clock generation. The dual-mode QuadSPI interface supports XIP and memory-mapped execution from external serial flash.

Key Specifications

Pinout & Package

LQFP100 package with exposed thermal pad; 100-pin square outline, 14 × 14 mm body, 0.5 mm lead pitch, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-performance Cortex-M4 MCU applications.

Compared with STM32F429ZIT6, the STM32F446VET6 trades LCD-TFT capability for SPDIF-RX and dual SAI-making it superior for audio-focused endpoints. Against STM32H743VIT6, it offers lower cost and power with purpose-built audio timing, though at reduced raw compute headroom.

Availability

STM32F446VET6 is available at Aetrix Electronics and suitable for industrial motor control, professional audio endpoints, USB-C field programmers, and smart grid data concentrators requiring stable component supply across extended product lifecycles.

Supply support for STM32F446VET6 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 components for industrial, automotive, and consumer markets.

The STM32F4 series targets high-performance embedded applications demanding real-time processing, rich connectivity, and deterministic peripheral response-especially where DSP, USB, and analog signal chain integration are critical.

FAQ

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

The STM32F446VET6 achieves 180 MHz maximum CPU frequency using its internal high-speed oscillator (HSI) or external crystal (HSE) fed into the main PLL. The ART Accelerator™ enables zero-wait-state execution from flash memory at this speed, eliminating performance penalties from flash latency. This is validated across temperature and voltage ranges per datasheet Section 6.3.11.

Does the part support USB High-Speed device mode without an external PHY?

No. USB High-Speed (480 Mbps) operation requires an external ULPI-compliant PHY connected to the dedicated ULPI interface (pins PB12–PB13, PD0–PD5). The on-chip PHY supports Full-Speed (12 Mbps) only. This is explicitly stated in Section 3.34 and Table 20 of the DS10693 datasheet.

How many independent clock domains does the device provide for audio applications?

The device provides three independent clock domains for audio: main system clock (via main PLL), audio clock (via PLLI2S), and SAI clock (via PLLSAI). Each can be configured separately - for example, PLLI2S locked to 44.1 kHz I²S master clock while main PLL runs at 180 MHz - ensuring jitter-free audio synchronization without affecting CPU performance.

What is the role of the Flexible Memory Controller (FMC) in this MCU?

The FMC enables direct connection to external parallel memories including NOR/NAND flash, SDRAM, and PSRAM using a configurable 8/16-bit data bus. It supports wait-state insertion, burst modes, and asynchronous/synchronous protocols - allowing expansion of code space beyond 512 KB flash or addition of frame buffers for display/audio applications, as detailed in Section 3.9 and Table 3.9 of DS10693.