280 MHz Cortex-M7 with 2 MB Flash and 1.4 MB RAM
The STM32H7B3RIT6: ARM Cortex-M7 core at 280 MHz with 2 MB Flash and 1.4 MB RAM in a 64-LQFP package.
What the 280 MHz and memory mean for the BOM
The 280 MHz core clock on the Cortex-M7 with a single-cycle multiply-accumulate and double-precision FPU gives this MCU enough headroom to run a real-time control loop alongside a GUI stack without a separate display controller. The 1.4 MB RAM is unusually large for a 64-pin MCU — enough to hold a full frame buffer for a QVGA LCD or a large audio sample buffer, saving an external SRAM. The 2 MB Flash can store a second-stage bootloader plus application code with room for OTA image staging. For designs that need to log data or run complex state machines, this memory sizing means you can skip external memory entirely in many cases.
Connectivity and peripheral count in a 64-pin package
The trade-off is pin multiplexing — you cannot enable every peripheral simultaneously with 49 I/O. For a motor-drive design that needs CAN, encoder inputs (via timer channels), and a UART debug port, the pinout works. The EBI/EMI interface, if used, consumes a significant number of pins, so plan the pin allocation early in schematic capture.
The supply range from 1.62 V to 3.6 V covers both 1.8 V and 3.3 V logic rails, and the 1.62 V minimum is low enough to run from a single Li-ion cell near end-of-discharge. The internal POR and brown-out reset handle power-up sequencing cleanly, reducing external supervisor IC cost.
Lifecycle and sourcing
This is a mainstream STM32H7 variant, so supply through the independent channel is consistent. There is no LTB risk on this line today.