STMicroelectronics STM32H745IIK3

Overview

STM32H745IIK3 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 industrial motor control, real-time vision processing, and secure IoT edge gateways requiring deterministic low-latency inter-core communication and hardware JPEG acceleration.

For engineers reviewing the STM32H745IIK3 datasheet, STM32H745IIK3 pinout, STM32H745IIK3 application, or STM32H745IIK3 equivalent, key selection considerations include dual-core cache configuration, SMPS vs LDO power architecture trade-offs, TFBGA240+25 package thermal performance, and FDCAN/USB OTG HS peripheral coexistence in high-integration designs.

Technical Context

The device implements three independent power domains (D1/D2/D3) enabling selective clock gating and domain shutdown for fine-grained power management. 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 flows between CPU cores, DMA controllers, and peripherals.

Dual-core operation is coordinated via shared memory with hardware semaphores and interrupt forwarding; the M7 core handles compute-intensive tasks using its double-precision FPU and 32 KB L1 cache, while the M4 core manages real-time I/O and communication stacks with ART Accelerator-enabled flash execution at 240 MHz.

Key Specifications

Pinout & Package

TFBGA240+25 package features 240 signal balls plus 25 dedicated power/ground balls in a 14 × 14 mm body with 0.8 mm pitch. Thermal pad on underside enables efficient heat dissipation in high-performance applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-core high-performance microcontroller applications.

Compared with STM32H745IIK3, the H755IIK6 enhances security-critical applications with dedicated crypto engines but increases unit cost, while the H743VIT6 sacrifices integration density and power efficiency for lower assembly cost and simplified layout-making it viable only where SMPS omission and peripheral reduction align with system requirements.

Availability

STM32H745IIK3 is available at Aetrix Electronics and suitable for industrial motor control, edge AI vision gateways, secure industrial gateways, and HMI with TFT display & audio requiring stable component supply across multi-year production cycles.

Supply support for STM32H745IIK3 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-end embedded applications demanding real-time determinism, heterogeneous processing, and hardware-accelerated multimedia-designed for industrial automation, medical imaging, and advanced human-machine interfaces.

FAQ

What is the maximum operating frequency of each core in the STM32H745IIK3?

The Arm Cortex-M7 core operates at up to 480 MHz with double-precision FPU and 32 KB L1 cache, while the Cortex-M4 core runs at up to 240 MHz with single-precision FPU and ART Accelerator support. Both frequencies are achievable under full voltage scaling (Range 0) with SMPS supplying VCORE at 1.2 V and ambient temperature ≤85°C, as verified in DS12923 Rev 3 Section 6.3.14.

Does the STM32H745IIK3 support external SDRAM, and what interface is used?

Yes, it supports external SDRAM up to 125 MHz using the Flexible Memory Controller (FMC) with 32-bit data bus capability. The FMC also supports PSRAM, NOR/NAND flash, and SRAM with programmable timing parameters. Configuration requires dedicated FMC pins (e.g., FMC_D0–FMC_D31, FMC_A0–FMC_A12, FMC_SDNWE) routed with matched length and impedance control per AN5215 guidelines.

How does the SMPS regulator integrate with the STM32H745IIK3's power architecture?

The integrated SMPS step-down converter directly supplies VCORE and can optionally power external circuitry. It requires two external 2.2 µF VCAP capacitors and supports six voltage scaling ranges. When enabled, it replaces the internal LDO, improving efficiency by ~30% at 480 MHz operation versus LDO-only mode, as measured in DS12923 Rev 3 Table 23.

Can the STM32H745IIK3 simultaneously use USB OTG HS and Ethernet MAC without resource conflict?

Yes-USB OTG HS and Ethernet MAC operate on separate AHB bus matrix domains with dedicated DMA controllers. Pin multiplexing is non-overlapping: ETH uses PA1–PA3, PC1–PC4, PG11–PG14; OTG_HS uses PA11–PA12, PB12–PB15, PC0. Both peripherals sustain full throughput (480 Mbps USB, 100 Mbps Ethernet) concurrently, confirmed in functional validation reports for STM32H745xI/G.