STMicroelectronics STM32F446ZEH6TR

Overview

STM32F446ZEH6TR from STMicroelectronics is a 32-bit Arm® Cortex®-M4 MCU 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 STM32F446ZEH6TR datasheet, STM32F446ZEH6TR pinout, STM32F446ZEH6TR application, or STM32F446ZEH6TR equivalent, key selection criteria include its 144-pin LQFP package, 180 MHz CPU clock with ART Accelerator, dual-mode QuadSPI interface, 2× CAN 2.0B controllers, and hardware RTC with subsecond accuracy - all validated for deterministic timing-critical firmware deployment.

Technical Context

The device integrates an Adaptive Real-Time Accelerator (ART) enabling zero-wait-state execution from flash at 180 MHz, alongside a multi-AHB bus matrix for concurrent access to flash, SRAM, and peripherals. Its memory subsystem includes flexible external memory controller (FMC) supporting SDRAM, NOR/NAND, and PSRAM, plus dual-mode QuadSPI for high-speed serial flash expansion.

Peripherals are architected for audio and connectivity: two SAI interfaces support I²S/TDM with independent audio PLLs (PLLI2S/PLLSAI), SPDIF-RX enables digital audio input, and dual USB OTG controllers (one with dedicated DMA and ULPI support) provide simultaneous full-speed and high-speed host/device operation across a single power rail.

Key Specifications

Pinout & Package

LQFP144 (20 × 20 mm, 0.5 mm pitch) with exposed thermal pad; 144 pins including VDD/VSS power rails, 114 user-configurable I/Os, dedicated debug (SWD/JTAG), USB OTG HS/FS PHY pins, and peripheral-specific functions (e.g., DCMI, SAI, QuadSPI).

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 STM32F446ZEH6TR trades display capability for superior audio connectivity (SPDIF-RX, dual SAI) and serial flash flexibility (QuadSPI); versus STM32H743ZIT6, it offers lower cost, lower power, and proven toolchain maturity for real-time audio/motor control without M7 complexity.

Availability

STM32F446ZEH6TR is available at Aetrix Electronics and suitable for industrial motor control, USB audio interfaces, smart building gateways, and medical data loggers requiring stable component supply and long-term production support through May 2026.

Supply support for STM32F446ZEH6TR 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 devices for industrial, automotive, and consumer markets.

The STM32F4 series targets high-performance embedded applications demanding real-time processing, rich connectivity, and deterministic peripheral timing - optimized for motor control, audio, and USB-hosted edge devices.

FAQ

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

The STM32F446ZEH6TR achieves 180 MHz CPU frequency using its internal 16 MHz RC oscillator multiplied by the main PLL, with the ART Accelerator enabling zero-wait-state execution from flash memory. This eliminates instruction fetch stalls and guarantees deterministic timing for real-time tasks like motor control PWM generation.

Does this MCU support external SDRAM, and what interface is used?

Yes, it supports external SDRAM via the Flexible Memory Controller (FMC) with a 16-bit data bus and dedicated control signals (RAS/CAS/WE). The FMC implements LPSDR SDRAM timing, enabling up to 128 MB expansion for frame buffers or large data structures in HMI or imaging applications.

How many USB interfaces does the STM32F446ZEH6TR have, and what are their capabilities?

It integrates two independent USB controllers: OTG_FS (full-speed only, 12 Mbps) and OTG_HS (high-speed/full-speed, 480/12 Mbps). OTG_HS supports ULPI physical layer or on-chip full-speed PHY, and both controllers feature dedicated DMA channels, enabling simultaneous host and device operation without CPU intervention.

What low-power modes are supported, and what is retained in Standby mode?

It supports Sleep, Stop, and Standby modes. In Standby mode, only the RTC, 20×32-bit backup registers, and optional 4 KB backup SRAM remain powered from VBAT. All clocks stop, core state is lost, but wake-up occurs in under 20 µs via RTC alarm or external interrupt, making it ideal for battery-backed data logging.