Automotive-grade SPI NOR with 105°C ceiling
The MT25TL256BBA8ESF-0AAT: The 16-SOIC (7.50 mm width) package, also designated 16-SOP2, is a standard JEDEC footprint for SPI NOR devices — the same land pattern serves the wider MT25Q family, so a board designed for the commercial MT25QL256 can accept this automotive-grade part with no layout change.
Write-cycle timing and firmware update budget
The write cycle time is 8 ms typical for a word (16-bit) program and 2.8 ms typical for a page (256-byte) program — these are the per-operation latencies the firmware update routine must budget for; a full 256 Mbit erase followed by a page-program pass takes roughly 1.5 seconds at the page rate, not counting the sector-erase time (which is typically 45 ms per 64 KB sector). Because the part is organized as 32 M x 8 bits, the address space maps naturally to byte-addressable firmware images — no awkward word-alignment padding required in the bootloader.
Active lifecycle with no LTB urgency
It is ROHS3 compliant, so no exemption-related procurement risk for EU or UKCA markets.