8 Mbit parallel NOR flash in a 48-ball BGA
The SST39VF800A-70-4I-MAQE-T is an 8 Mbit parallel NOR flash from Microchip Technology's SST39 MPF series, organized as 512K x 16 bits and accessed through a parallel interface with a 70 ns access time. The 70 ns access time means the part can keep up with moderate-speed MCUs and DSPs without inserting wait states on random reads — a key fit criterion for direct-execution firmware, not just data logging.
Housed in a 48-ball WFBGA (6 mm x 4 mm) with a 0.50 mm ball pitch, this package demands careful PCB layout — the fine pitch and exposed die paddle require a controlled solder-paste stencil and a reflow profile matched to the JEDEC moisture sensitivity level of the part. Supplied on tape and reel, the part is ready for automated pick-and-place assembly in volume production.
Write-cycle budget and firmware updates
The page write cycle time is 20 µs — a full 512 KB sector rewrite at the page level takes roughly 20 ms, which is fast enough for in-field firmware updates over a UART or CAN bootloader without a dedicated flash programmer. Because it is a NOR flash, the random-read speed (70 ns) is the same as the byte-wide read access — no page-buffer penalty on scattered reads, which matters when the CPU fetches interrupt vectors or lookup tables from arbitrary addresses.