280 MHz Cortex-M7 with 2 MB Flash — what it means for the BOM
The STM32H7A3IIK6 is a 32-bit single-core ARM Cortex-M7 microcontroller from ST's STM32H7 series, clocked at 280 MHz with 2 MB of Flash and 1.4 MB of RAM. That memory density — 2 MB program space and 1.4 MB of SRAM — lets it run complex firmware stacks, hold graphics frame buffers for an LCD, or buffer data-logging streams without external memory. The 128 I/O lines and rich connectivity (CANbus, USB OTG, Ethernet via EBI/EMI, multiple SPI/I²C/UART) suit it for industrial gateways, motor-control panels, and HMI modules where a single-chip MCU replaces a processor-plus-FPGA pair.
Industrial temperature and BGA package — deployment reality
Rated for -40 to 85 °C ambient, this part fits factory-floor enclosures, outdoor telecom cabinets, and ventilated control panels — not under-hood or extended automotive. The 176+25 UFBGA (10x10 mm) is a fine-pitch BGA; board assembly needs controlled reflow, X-ray inspection, and a clean PCB surface finish. The 1.62 V to 3.6 V supply range lets it run from a single rail, simplifying the power tree.
Lifecycle: end-of-life — sourcing through independent channels
The STM32H7A3IIK6 is recorded as end-of-life (EOL). ST has moved production focus to later H7 variants. For BOM lines already qualified to this exact footprint and firmware, the independent surplus and broker channel is the practical supply route. We source and quote this part to order against an RFQ — availability and current pricing confirmed at quote time. No official pin-compatible replacement is listed in the evidence; a design migration to a current STM32H7 family member would require a firmware port and board re-spin.