The S25FL164K0XNFI011: This is a non-volatile memory intended for code shadowing, firmware storage, and data logging in embedded systems. The Quad I/O capability lets it sustain higher read throughput than a standard SPI part — useful when the host MCU executes code directly from the Flash (execute-in-place, or XIP) and needs to minimise wait states. The 3 ms page write cycle means the programming throughput is adequate for field updates and configuration storage, though not for high-frequency data logging.
Package and footprint — 8-WSON (5x6) exposed pad
Housed in an 8-WFDFN with exposed pad, the supplier device package measures 5 mm x 6 mm. Surface-mount reflow per the standard JEDEC profile works, but the exposed pad means the solder paste coverage under the die attach area matters for voiding.
The S25FL164K0XNFI011 is marked obsolete. That means Infineon has stopped production; there is no last-time-buy window remaining through the factory. Any units available today are from surplus or broker inventory. When sourcing this part, date-code provenance matters — old stock that has been sitting for years may have moisture sensitivity issues (MSL) or degraded solderability.