STMicroelectronics STM32H745IIT3

Overview

STM32H745IIT3 from STMicroelectronics is a dual-core 32-bit Arm® Cortex®-M7 (up to 480 MHz) and Cortex®-M4 (up to 240 MHz) microcontroller with 2 MB flash, 1 MB RAM, integrated SMPS regulator, and 168 GPIOs. It supports real-time deterministic control in industrial PLCs, motor drives, and edge AI inference at the device level.

For engineers reviewing the STM32H745IIT3 datasheet, STM32H745IIT3 pinout, STM32H745IIT3 application, or STM32H745IIT3 equivalent, key selection considerations include dual-core asymmetric processing capability, on-chip SMPS for power efficiency, TCM RAM partitioning for time-critical routines, and FDCAN/USB OTG/Ethernet interface concurrency.

Technical Context

The device implements a three-domain power architecture (D1/D2/D3), enabling independent clock gating and voltage scaling across high-performance, communication, and system-control subsystems. Its interconnect matrix includes one AXI and two AHB bus matrices with five AHB2-APB bridges, supporting concurrent high-bandwidth peripheral access without CPU arbitration bottlenecks.

Dual-core operation is coordinated via shared memory, mailbox, and semaphore mechanisms; the M7 core handles compute-intensive tasks (e.g., JPEG decode, FFT) using 32 KB I/D cache and DSP extensions, while the M4 executes real-time control loops with ART Accelerator-enabled zero-wait-state flash execution.

Key Specifications

Pinout & Package

STM32H745IIT3 uses a 176-pin UFBGA package (10 × 10 mm, 0.8 mm pitch) with 168 user I/Os distributed across 11 groups (GPIOA–GPIOI, GPIOK, GPIOL). Power supply pins include VCORE, VDD, VDDA, VREF+, VBAT, and dedicated VCAP capacitor connections for SMPS stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-core Arm Cortex-M7/M4 microcontroller applications.

Compared with STM32H745IIT3, the H755IIT6 adds hardware crypto without sacrificing performance or footprint, while the H743VIT6 trades SMPS, JPEG, and DFSDM for lower cost and simpler power design in non-edge-AI applications.

Availability

STM32H745IIT3 is available at Aetrix Electronics and suitable for industrial motor drives, edge AI gateways, programmable logic controllers, and HMI displays requiring stable component supply across long-life production cycles.

Supply support for STM32H745IIT3 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.

The STM32H7 series targets high-end embedded applications demanding real-time determinism, heterogeneous computing, and rich peripheral integration - particularly in industrial automation, medical imaging, and smart infrastructure.

FAQ

What is the maximum operating temperature range for STM32H745IIT3?

The STM32H745IIT3 is rated for industrial temperature range: –40 °C to +85 °C. Extended temperature variants (e.g., STM32H745IIK3) support up to +125 °C but require specific part numbers and qualification testing per ST's ECOPACK2 compliance documentation.

Does STM32H745IIT3 support TrustZone security?

No. STM32H745IIT3 does not implement Arm TrustZone. Security features include ROP/PC-ROP, active tamper detection, and write protection for flash/SRAM. For TrustZone-enabled dual-core operation, consider the STM32H757/753 series with Cortex-M7 + Cortex-M4 and TrustZone memory isolation.

Can both Cortex-M7 and Cortex-M4 cores access the same peripherals simultaneously?

Yes, but with arbitration. Peripherals are mapped to specific power domains (D1/D2/D3); concurrent access is managed via the interconnect matrix and AHB/AXI bus arbitration logic. Critical peripherals like timers and ADCs support dual-core triggering via event lines and DMA request routing to avoid contention.

What development tools are officially supported for STM32H745IIT3?

ST provides full support via STM32CubeH7 firmware package, STM32CubeMX configuration tool, and STM32CubeIDE (Eclipse-based). Hardware tools include ST-LINK/V3 debug probe and evaluation boards such as STM32H745I-EVAL and STM32H745I-DISCO. Keil MDK and IAR Embedded Workbench also offer certified toolchains.