128 Mbit NOR flash with a 133 MHz Quad SPI bus
The 133 MHz clock rate on a Quad I/O interface translates to a sustained read throughput that can keep a Cortex-M or RISC-V core fed during code execution from flash. In practice, the effective throughput depends on the command overhead and the controller's ability to pipeline reads, but the raw 133 MHz Quad I/O rate is well above the 50–80 MHz typical of basic SPI NOR parts. For a design that currently uses a slower SPI flash and needs to reduce boot time or support a larger firmware image, this part lets you stay on a serial interface rather than moving to a parallel NOR or NAND with a wider bus.
The active status also means the part is available through franchised distribution as well as independent channels, so the supply picture is not limited to surplus inventory.
16-SOIC wide-body — footprint and layout fit
It is the same package used by many other 128 Mbit and 256 Mbit SPI NOR parts from multiple vendors, which simplifies second-source qualification or a last-minute alternate if the primary supply tightens. The surface-mount package is suitable for reflow assembly, and the wide-body SOIC gives reasonable clearance for routing the four I/O lines, the chip select, and the clock on a two-layer board.