Dual-core architecture — why the speed split matters
The STM32H745IIT3 is a 32-bit dual-core microcontroller from ST's STM32H7 series, pairing an ARM Cortex-M4 core running at 240 MHz with a Cortex-M7 core at 480 MHz. This asymmetric architecture lets you offload real-time control loops (motor PWM, sensor polling) to the M4 while the M7 handles heavy compute — DSP, floating-point math, or Ethernet stack processing — without one task starving the other. The 2 MB of on-chip Flash (2M x 8) and 1 MB of RAM (1M x 8) give enough room for dual-bank firmware updates or OTA staging without external memory.
Connectivity and peripheral count
With 119 I/Os and a rich peripheral set including Ethernet, dual CAN-FD, USB OTG, QSPI, SAI, SPDIF, and a 28-channel 16-bit ADC plus dual 12-bit DACs, this MCU can serve as the central controller in a gateway, an HMI panel, or a multi-axis servo drive. The 176-LQFP (24x24 mm) package keeps routing manageable on a four-layer board.
Lifecycle and sourcing posture
For volume production or dual-source qualification, the STM32H743 is a single-core sibling in the same package and pinout — the difference is the second Cortex-M4 core on the H745.