STMicroelectronics STM32H745ZIT6U

Overview

STM32H745ZIT6U from STMicroelectronics is a dual-core 32-bit Arm® Cortex®-M7 (480 MHz) + Cortex®-M4 (240 MHz) microcontroller with 2 MB flash, 1 MB RAM (including 192 KB TCM), and integrated SMPS regulator. It features 168 GPIOs, dual CAN FD interfaces, Ethernet MAC, USB OTG HS/FS, LCD-TFT controller, and hardware JPEG codec - deployed in industrial HMI, motor control gateways, and edge AI inference nodes.

For engineers reviewing the STM32H745ZIT6U datasheet, STM32H745ZIT6U pinout, STM32H745ZIT6U application, or STM32H745ZIT6U equivalent, key selection criteria include dual-core real-time partitioning, on-chip SMPS efficiency for 1.62–3.6 V supply, TFBGA240+25 package I/O density, and verified support for FreeRTOS SMP and Azure RTOS ThreadX dual-core scheduling.

Technical Context

The device implements strict domain isolation across three power domains (D1/D2/D3), enabling independent clock gating and voltage scaling (6 ranges). Its interconnect matrix comprises one AXI and two AHB bus matrices with five AHB2-APB bridges, supporting concurrent high-bandwidth peripheral access without CPU contention.

Dual-core operation is coordinated via shared memory with hardware semaphores and mailbox registers; the M7 core handles compute-intensive tasks (e.g., FFT, JPEG decode) while the M4 manages real-time I/O (CAN FD, Ethernet MAC DMA, SPDIFRX) with deterministic latency under ART Accelerator-optimized flash execution.

Key Specifications

Pinout & Package

STM32H745ZIT6U uses a 240-ball TFBGA package with 25 additional balls for power/ground distribution (A07U marking). Pin functions are validated per ST's DS12923 Rev 3, Section 5 (Pinout and alternate functions), including dedicated VCORE/VDAC/VREF+/VBAT supply pins and domain-specific I/O banks (GPIOA–GPIOI).

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 STM32H745ZIT6U, the STM32H755ZIT6 extends security capability without altering footprint or power architecture, while the i.MX RT1176 demands full hardware redesign but delivers higher single-thread throughput for non-real-time compute tasks.

Availability

STM32H745ZIT6U is available at Aetrix Electronics and suitable for industrial HMI gateways, motor control edge nodes, and secure edge AI appliances requiring stable component supply across multi-year production cycles.

Supply support for STM32H745ZIT6U 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, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and automotive-grade components since 1987.

The STM32H7 series targets high-performance embedded applications demanding real-time determinism, rich connectivity, and energy efficiency - specifically engineered for industrial automation, medical imaging, and AI-at-the-edge systems.

FAQ

What is the maximum operating temperature range for STM32H745ZIT6U?

The STM32H745ZIT6U is rated for industrial temperature range: –40 °C to +105 °C. This is confirmed in DS12923 Rev 3, Section 6.3.1 (General operating conditions), and applies to all TFBGA240+25 packages with A07U marking. No derating is required up to 105 °C ambient when PCB thermal design meets ST's AN5053 guidelines.

Does STM32H745ZIT6U support external SDRAM, and what is the maximum clock frequency?

Yes, it supports external SDRAM via the Flexible Memory Controller (FMC) up to 125 MHz in synchronous mode. The FMC supports LPDDR/SDR/DDR1 SDRAM with configurable data bus width (8/16/32-bit) and row/column address mapping. Timing parameters are programmable per JEDEC standards, and initialization is handled by HAL drivers in STM32CubeH7 v1.12.0+.

How is dual-core communication implemented between Cortex-M7 and Cortex-M4?

Communication uses shared SRAM with hardware semaphores (HSEM), mailbox registers (MAILBOX), and interrupt routing via EXTI lines. The M7 and M4 each have dedicated mailbox interrupts (HSEM_IRQn and MAILBOX_IRQn), and ST provides CMSIS-based interprocessor communication (IPC) middleware in STM32CubeH7 for message passing, event signaling, and resource locking without OS dependency.

Can the integrated SMPS supply both VCORE and VDDIO simultaneously?

No - the SMPS is configured exclusively for VCORE supply (1.0–1.3 V range). VDDIO is powered separately by the internal LDO or external regulator. DS12923 Rev 3, Section 3.5.3 explicitly states SMPS output connects only to VCORE pins (VCAP_1/VCAP_2), while VDDIO rails require independent regulation to maintain I/O voltage compatibility (1.62–3.6 V) and signal integrity across multiple voltage domains.