STMicroelectronics STM32F446MEY6TR

Overview

STM32F446MEY6TR from STMicroelectronics is a 32-bit Arm® Cortex®-M4 microcontroller with FPU, operating up to 180 MHz, 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 CAN 2.0B interfaces - deployed in industrial motor control and audio processing systems requiring real-time signal handling and multi-interface connectivity.

For engineers reviewing the STM32F446MEY6TR datasheet, STM32F446MEY6TR pinout, STM32F446MEY6TR application, or STM32F446MEY6TR equivalent, key selection criteria include ART Accelerator-enabled zero-wait-state flash execution, 114 I/Os with 90 MHz toggle rate and 5 V tolerance, dual SAI for stereo audio streaming, and dedicated USB HS DMA supporting concurrent host/device operation.

Technical Context

The device integrates an Adaptive Real-Time Accelerator (ART) enabling deterministic 0-wait-state execution from flash at 180 MHz, paired with a multi-AHB bus matrix for concurrent peripheral access. 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.

Clock architecture features four PLLs: main PLL for CPU/system clocks, PLLI2S for audio-class I2S/SAI synchronization, PLLSAI for SAI clock generation, and dedicated USB PLL - all configurable via RCC registers with spread-spectrum support to reduce EMI. Power management supports Sleep/Stop/Standby modes with VBAT-backed RTC and 4 KB backup SRAM.

Key Specifications

Pinout & Package

STM32F446MEY6TR is housed in a 81-ball WLCSP (Wafer-Level Chip Scale Package) measuring 4.32 × 4.32 mm with 0.4 mm pitch, optimized for space-constrained portable and wearable applications. Pin assignment follows ST's standardized ball-out for STM32F446xE series, with VDD/VSS pairs distributed for low-noise power delivery and dedicated VCAP pins for internal regulator stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F446MEY6TR, STM32F413RG trades USB HS and audio peripherals for lower BOM cost and power, while STM32H743VI delivers higher compute density and connectivity at increased complexity and thermal budget - making the F446MEY6TR optimal for balanced real-time audio/motor control in compact form factors.

Availability

STM32F446MEY6TR is available at Aetrix Electronics and suitable for industrial motor control, professional audio interfaces, medical patient monitors, and smart home hubs requiring stable component supply across multi-year production cycles.

Supply support for STM32F446MEY6TR 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, sensors, and automotive ICs with vertical manufacturing and broad industrial IP portfolio.

The STM32F4 series targets high-performance embedded applications demanding DSP capability, rich connectivity, and real-time responsiveness - particularly where Cortex-M4+FPU, analog integration, and USB/audio peripherals converge.

FAQ

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

The STM32F446MEY6TR achieves 180 MHz maximum CPU frequency using its internal main PLL, fed by either the 4–26 MHz HSE crystal or 16 MHz HSI RC oscillator. The Adaptive Real-Time Accelerator (ART) ensures zero-wait-state execution from flash memory at this speed, eliminating performance penalties from flash latency. This configuration is validated across the full temperature and voltage range (1.7–3.6 V) per datasheet Section 6.3.1.

Does this part include an integrated USB HS PHY?

No, the STM32F446MEY6TR includes an integrated full-speed USB PHY but requires an external ULPI PHY for high-speed (480 Mbps) USB OTG operation. The HS controller provides dedicated DMA and clocking infrastructure, while the ULPI interface (pins PA3, PB0–PB5) connects to compliant transceivers such as the USB334x series. This architecture balances integration and flexibility for varying speed requirements.

How many ADC channels are supported and what is their maximum aggregate sampling rate?

The device integrates three independent 12-bit ADCs (ADC1–ADC3), each supporting up to 24 external channels. In triple interleaved mode, they achieve 7.2 MSPS aggregate sampling - meaning synchronized conversion across all three ADCs at 2.4 MSPS each. This mode is configured via ADC_CCR register and requires precise timing alignment; it is commonly used for motor current sensing and multi-sensor acquisition in real-time control loops.

What package type and ball pitch does the STM32F446MEY6TR use?

The STM32F446MEY6TR uses a 81-ball WLCSP (Wafer-Level Chip Scale Package) with dimensions of 4.32 × 4.32 mm and a 0.4 mm ball pitch. It conforms to JEDEC MO-220 standards and is marked "MEY6TR" on the top surface. This package is designed for automated assembly in high-density portable electronics and requires controlled-depth reflow profiling due to its ultra-thin silicon substrate and underfill sensitivity.