It uses an SPI Quad I/O interface running at 66 MHz, which means the read throughput can be four times that of a standard SPI bus without adding extra pins — useful for fast code shadowing or OTA staging in embedded systems.
The 24-TBGA package (6x8 mm body) keeps the footprint small for space-constrained PCBs, but the BGA requires careful reflow profiling — MSL handling and a dry bake before assembly if the moisture barrier bag has been open past the floor life.
For dual-sourcing resilience, the FL-S family includes multiple density and package variants sharing the same Quad I/O command set, so a drop-in migration path exists within the series if future capacity needs change.