STMicroelectronics STM32H745XIH3

Overview

STM32H745XIH3 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 (including 192 KB TCM), integrated SMPS regulator, and 168 GPIOs. It supports real-time deterministic control in industrial PLCs, motor drives, and embedded vision systems requiring concurrent high-performance computation and low-latency peripheral handling.

For engineers reviewing the STM32H745XIH3 datasheet, STM32H745XIH3 pinout, STM32H745XIH3 application, or STM32H745XIH3 equivalent, key selection considerations include dual-core asymmetric execution, voltage scaling across six power ranges, hardware JPEG codec, LCD-TFT controller up to XGA, and FDCAN with FD capability for automotive and industrial networking.

Technical Context

The device implements three independent power domains (D1/D2/D3) enabling selective clock gating and domain shutdown-D1 hosts the M7 core and high-speed peripherals, D2 manages communication interfaces and timers, and D3 handles reset/clock/power control. Its interconnect matrix comprises one AXI and two AHB bus matrices with five AHB2-APB and two AXI2-AHB bridges for deterministic latency and bandwidth isolation.

Dual-core operation is coordinated via shared memory with hardware semaphores and interrupt forwarding; the M7 executes time-critical tasks using ITCM/DTCM RAM (64 KB/128 KB), while the M4 handles communication stacks and sensor fusion using ART-accelerated flash execution. The integrated SMPS step-down converter directly supplies VCORE at up to 1.3 V with configurable output, reducing external BOM count versus LDO-only solutions.

Key Specifications

Pinout & Package

STM32H745XIH3 is housed in a TFBGA240+25 package (14 × 14 mm, 0.8 mm ball pitch) with 240 signal balls plus 25 dedicated power/ground balls. The package supports fine-pitch PCB routing and thermal dissipation suitable for high-density industrial and automotive modules.

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 STM32H755XIH3, the STM32H745XIH3 offers identical real-time performance and peripheral set at lower cost and power without cryptographic acceleration-making it optimal for cost-sensitive industrial controls. Versus i.MX RT1176DVMAA, it trades peak M7 frequency for integrated flash, SMPS, and lower static power-favoring battery-backed or thermally constrained deployments.

Availability

STM32H745XIH3 is available at Aetrix Electronics and suitable for industrial motor control, automotive camera hubs, human-machine interfaces, and programmable logic controllers requiring stable component supply across multi-year production cycles.

Supply support for STM32H745XIH3 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 management ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32H7 series targets high-end embedded applications demanding real-time determinism, rich connectivity, and graphical capability-designed specifically for industrial automation, motor control, and advanced HMI where dual-core asymmetry and hardware acceleration reduce system-level complexity.

FAQ

What is the maximum operating frequency of each core in the STM32H745XIH3?

The Arm Cortex-M7 core operates at up to 480 MHz with double-precision FPU and L1 cache (16 KB instruction + 16 KB data); the Cortex-M4 core runs at up to 240 MHz with single-precision FPU and ART Accelerator support. Both cores sustain their maximum frequencies under full voltage scaling (Range 0) with SMPS regulator enabled and proper thermal management.

Does the STM32H745XIH3 support external SDRAM, and what interface is used?

Yes, it supports external SDRAM up to 32-bit data bus width via the Flexible Memory Controller (FMC). The FMC operates in synchronous mode up to 125 MHz and supports LPDDR/SDR SDRAM, PSRAM, NOR/NAND flash, and SRAM-enabling expansion beyond the 1 MB on-chip RAM for applications like frame buffering or large data logging.

How many CAN interfaces does the STM32H745XIH3 include, and what protocols do they support?

The device integrates two FDCAN controllers compliant with ISO 11898-1:2015, supporting Classical CAN, CAN FD (up to 5 Mbps data phase), and time-triggered CAN (TT-CAN) modes. Each controller has dedicated message RAM, flexible filtering, and loopback/self-test capabilities-suitable for automotive body control and industrial fieldbus gateways.

Is the TFBGA240+25 package of the STM32H745XIH3 compatible with reflow soldering, and what is its thermal resistance?

Yes, the TFBGA240+25 package is qualified for standard lead-free reflow profiles (J-STD-020). Its typical junction-to-case thermal resistance (R_θJC) is 12.5 °C/W, and junction-to-ambient (R_θJA) is 28.3 °C/W with 2-layer PCB and 1 oz copper-requiring thermal vias under the exposed pad and adequate copper pour for sustained 480 MHz operation in ambient temperatures up to 85 °C.