STMicroelectronics STM32H745BIT3

Overview

STM32H745BIT3 from STMicroelectronics is a dual-core 32-bit Arm® Cortex®-M7/M4 microcontroller operating at up to 480 MHz (M7) and 240 MHz (M4), featuring 2 MB flash, 1 MB RAM (including 192 KB TCM), and integrated SMPS regulator. It supports real-time deterministic execution via dual L1 caches (16 KB I/D each for M7), ART Accelerator for zero-wait-state flash access, and hardware JPEG codec for embedded vision systems in industrial HMI and motor control applications.

For engineers reviewing the STM32H745BIT3 datasheet, STM32H745BIT3 pinout, STM32H745BIT3 application, or STM32H745BIT3 equivalent, key selection criteria include dual-core asymmetric processing capability, on-chip SMPS power architecture, 168 GPIOs with interrupt support, and dual CAN FD + Ethernet MAC interfaces for high-integrity connectivity in safety-critical edge devices.

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 comprises one AXI and two AHB bus matrices with five AHB2-APB and two AXI2-AHB bridges, supporting concurrent high-bandwidth data movement between dual cores and peripherals.

Dual-core operation is coordinated via shared memory, event forwarding, and semaphore-based synchronization. The M7 core executes time-critical tasks with double-precision FPU and DSP instructions, while the M4 handles real-time control loops and peripheral management - both supported by dedicated DMA controllers including MDMA (linked-list capable) and dual-port DMAs with FIFO buffering.

Key Specifications

Pinout & Package

STM32H745BIT3 is packaged in LQFP144 (20×20 mm, 0.5 mm pitch) with 144 pins. Pin functions are validated per STMicroelectronics' DS12923 Rev 3, Section 5 (Pinout, pin description and alternate functions).

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 STM32H745BIT3, the STM32H755BIT3 adds cryptographic acceleration for secure protocols but increases cost and power; the STM32H743VIT6 reduces pin count and removes SMPS, simplifying power design at the expense of integration and efficiency in battery-sensitive applications.

Availability

STM32H745BIT3 is available at Aetrix Electronics and suitable for industrial motor drives, edge AI vision terminals, secure gateways, and automotive diagnostic tools requiring stable component supply across extended product lifecycles.

Supply support for STM32H745BIT3 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, specializing in microcontrollers, power management, sensors, and automotive ICs.

The STM32H7 series targets high-performance embedded applications demanding real-time determinism, rich connectivity, and graphics capability - designed specifically for industrial automation, medical imaging, and next-generation human-machine interfaces.

FAQ

What is the maximum operating frequency of each core in the STM32H745BIT3?

The Arm Cortex-M7 core operates at up to 480 MHz with double-precision FPU and L1 cache; the Cortex-M4 core runs at up to 240 MHz with single-precision FPU and ART Accelerator. Both frequencies are achievable under full voltage scaling (Range 0) with SMPS enabled and proper thermal management per DS12923 Rev 3 Section 6.3.14.

Does the STM32H745BIT3 support external SDRAM, and what interface is used?

Yes, it supports external SDRAM up to 125 MHz clock rate via the Flexible Memory Controller (FMC), which provides a 32-bit data bus and supports SDRAM/LPSDR SDRAM, PSRAM, NOR/NAND flash, and SRAM. Configuration requires precise timing parameters defined in DS12923 Rev 3 Section 6.3.18 and RM0433 Reference Manual.

How does the integrated SMPS regulator differ from the LDO in power management?

The SMPS is a high-efficiency step-down DC/DC converter supporting direct VCORE supply (0.6–1.32 V) and external circuitry, achieving >90% efficiency at medium-to-high loads. The LDO provides low-noise, low-dropout regulation for sensitive analog blocks and backup domains, with lower efficiency but superior ripple rejection - both are independently controllable per power domain (D1/D2/D3).

Can the STM32H745BIT3 execute code from external Quad-SPI flash, and what is the maximum interface speed?

Yes, it supports XIP (execute-in-place) from Quad-SPI flash via the QUADSPI interface, running up to 133 MHz in DDR mode. This enables seamless code execution without copying to internal RAM, reducing boot time and memory footprint - verified in DS12923 Rev 3 Section 3.16 and AN5153 application note.