32 Mbit SPI NOR Flash — Quad I/O at 108 MHz
The S25FL132K0XNFV040 is a 32 Mbit SPI NOR Flash from the FL1-K series, organized as 4M x 8 bits. It supports Quad I/O reads at up to 108 MHz, delivering the throughput needed for fast boot code shadowing or firmware execution-in-place (XiP) from a serial bus.
Infineon has marked this part obsolete. For a buyer holding a BOM line with this order code, the immediate decision is whether to secure a last-time-buy quantity or qualify a functional replacement — the 8-USON (4x4 mm) footprint and 2.7–3.6 V supply rail narrow the field of drop-in alternatives.
Supplied in an 8-UDFN exposed pad package (also designated 8-USON, 4x4 mm body). The exposed paddle must be soldered to a thermal land on the PCB — the pad carries the ground reference and pulls heat from the die into the board copper. A 0.50 mm pitch, 8-lead footprint keeps the layout compact. The 3 ms page write cycle (typical) sets the firmware update window: a full 32 Mbit erase and reprogram cycle runs on the order of seconds, not milliseconds, so the system must hold the supply stable and the SPI bus quiet during that window.