16 Mbit NOR flash with Quad SPI — what the 108 MHz clock means for read throughput
The S25FL116K0XBHI023 is a 16 Mbit NOR flash memory from Infineon's FL1-K series, organized as 2M x 8 bits and accessed via a SPI Quad I/O interface running at up to 108 MHz. In quad-read mode, each clock cycle transfers four bits, so the raw throughput ceiling is 108 MHz × 4 bits = 54 MB/s — enough to feed a Cortex-M4 executing code-in-place or to stream firmware update data without stalling the bus.
Industrial temperature grade and BGA footprint — board-fit realities
The 24-TBGA package (8x6mm body) requires a controlled solder profile — the 0.8mm ball pitch is fine enough that a 4-layer PCB with microvias is typical for fan-out, though a 2-layer board can work if the signal routing is kept short and the ground plane is solid under the BGA. The page write cycle time is 3ms typical — budget this into the firmware update routine: writing a full 64 KB sector at 256-byte pages takes roughly 256 × 3ms = 768ms, plus sector erase time. For over-the-air updates, the host MCU must hold the SPI bus active through the write cycle or poll the status register.
Infineon lists the S25FL116K0XBHI023 as Obsolete. No pin-compatible drop-in replacement from Infineon is documented, so a board spin or firmware change may be required if migrating to a current-generation part.