STMicroelectronics STM32H745BIT6

Overview

STM32H745BIT6 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 46 communication/analog peripherals. It serves as a high-performance application processor in industrial HMI, motor control gateways, and real-time edge AI inference nodes requiring deterministic M7/M4 task partitioning.

For engineers reviewing the STM32H745BIT6 datasheet, STM32H745BIT6 pinout, STM32H745BIT6 application, or STM32H745BIT6 equivalent, key selection criteria include dual-core clock domain isolation, SMPS-enabled low-power operation down to 2.95 µA in Standby mode, TCM RAM allocation for time-critical routines, and FDCAN/TT-CAN support for automotive networked systems.

Technical Context

The device implements three independent power domains (D1/D2/D3) enabling selective clock gating and voltage scaling across performance, peripheral, 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 CPU cores, DMA controllers, and peripherals.

Dual-core operation is coordinated via shared memory with hardware semaphores and interrupt forwarding; the M7 core executes real-time control loops using 64 KB ITCM + 128 KB DTCM RAM, while the M4 handles protocol stacks and sensor fusion using ART-accelerated flash execution. Clock management includes three PLLs (system + two kernel) with fractional-N synthesis for jitter-sensitive interfaces like Ethernet MAC and SPDIFRX.

Key Specifications

Pinout & Package

STM32H745BIT6 is housed in a LQFP144 (20 × 20 mm) package with 144 pins, ECOPACK2-compliant, rated for industrial temperature range (–40 °C to +85 °C). Pin functions include dedicated VCAP capacitors for SMPS stability, dual VDD/VSS pairs per power domain, and segregated analog/digital ground planes.

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 STM32H745BIT6, the H755BIT6 adds certified security primitives without sacrificing performance or power efficiency, while the H743VIT6 trades peripheral richness and memory for lower pin count and unit cost-making it viable only in simplified control applications.

Availability

STM32H745BIT6 is available at Aetrix Electronics and suitable for industrial motor control gateways, automotive diagnostic tools, smart factory edge AI nodes, and HMI-controlled PLC expansion modules requiring stable component supply across extended product lifecycles.

Supply support for STM32H745BIT6 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 with vertical manufacturing capabilities.

The STM32H7 series targets high-end embedded applications demanding real-time determinism, rich connectivity, and graphics acceleration-designed specifically for industrial automation, automotive telematics, and AI-at-the-edge systems.

FAQ

What is the maximum operating frequency of each core in the STM32H745BIT6?

The Arm Cortex-M7 core operates at up to 480 MHz with double-precision FPU and L1 cache (16 KB instruction + 16 KB data), delivering 1027 DMIPS. The Cortex-M4 core runs at up to 240 MHz with single-precision FPU and ART Accelerator support, achieving 300 DMIPS. Both frequencies are achievable under full voltage scaling (Range 0) with SMPS enabled and proper thermal management.

Does the STM32H745BIT6 support external SDRAM, and what interface is used?

Yes, the STM32H745BIT6 supports external SDRAM up to 256 MB via its Flexible Memory Controller (FMC), which provides a 32-bit data bus and programmable timing parameters. The FMC also supports PSRAM, NOR/NAND flash, and LCD panels, with synchronous clocking up to 125 MHz-enabling high-bandwidth frame buffer access for TFT displays.

How does the SMPS regulator integrate with the STM32H745BIT6's power architecture?

The integrated SMPS step-down converter directly supplies the VCORE domain, replacing the traditional LDO for higher efficiency. It requires two external 2.2 µF VCAP capacitors (VCAP_1/VCAP_2 pins) and supports dynamic voltage scaling across six ranges. When enabled, it reduces active-mode current consumption by ~30% versus LDO-only operation and enables 2.95 µA Standby current with RTC active.

Can the STM32H745BIT6 execute code from external Quad-SPI flash, and what is the maximum interface speed?

Yes, the STM32H745BIT6 supports XIP (execute-in-place) from external Quad-SPI flash via its dedicated QUADSPI interface, which operates at up to 133 MHz (532 Mbps in quad mode). The interface supports octal DDR mode for higher bandwidth and includes hardware prefetch and cache line fill to minimize instruction fetch stalls during real-time execution.