128 Mbit NOR Flash for code storage — what the Quad SPI bus means for boot speed
The S25FL129P0XMFV003 is a 128 Mbit (16M x 8) NOR Flash from the FL-P series, organized for direct code execution or high-speed firmware shadowing. Its SPI Quad I/O interface at 104 MHz clock lets the controller read four bits per cycle — a 416 Mbps theoretical throughput that cuts boot time versus a standard SPI part running at the same clock. NOR Flash reads are fast enough to execute code in place (XiP) on many MCUs, so this part suits applications where the processor boots directly from flash without copying to RAM. The 5 µs word write and 3 ms page write cycle times mean field firmware updates are practical but budget the page erase time into the update window.
Industrial temp grade and supply — where this part fits on the board
Housed in a 16-SOIC wide-body (7.50 mm width) package, the part reworks cleanly with a hot-air station — the 0.295-inch body gives enough clearance for a nozzle to reach all pins without cooking adjacent components. Pin 1 is marked with a dot on the package top; the wide SOIC footprint is standard enough that a replacement part from another vendor often lands on the same pads without a board spin.
Obsolete — sourcing reality for a discontinued NOR Flash
For a BOM that already qualifies this footprint and interface, the procurement path is to request a quote against the required quantity. Availability and pricing vary by lot — the part is sourced to order, not held in ready inventory. If the design can tolerate a package change, a current-production NOR Flash in a different package may be a lower-risk long-term option, but that requires a board layout revision.