What this SPI NOR flash is and where it fits
The Infineon S25FL204K0TMFI013 is a 4 Mbit SPI NOR flash from the FL2-K series, organized as 512K × 8. It runs at 85 MHz clock frequency over a 2.7 V to 3.6 V supply rail, and comes in an 8-SOIC surface-mount package. The part is rated for industrial temperature range from -40°C to 85°C, making it suitable for code storage, parameter logging, or firmware shadowing in embedded control boards, telecom line cards, and industrial sensor nodes that need a non-volatile memory with a simple SPI interface.
85 MHz SPI bus — what it means for the design
The 85 MHz SPI clock supports single-I/O read operations. The 5 ms page write time is typical for this density class.
Obsolete — sourcing reality for this part
Infineon has marked the S25FL204K0TMFI013 as Obsolete. That means the manufacturer no longer produces it, and no last-time-buy window remains. For a BOM line that needs this exact order code, the only channel is the independent surplus and broker market. We source and quote it to order against an RFQ; availability and current pricing are confirmed at quote time. If you are qualifying a new design, look at the active FL2-K or FL-L family parts in the same 8-SOIC footprint — Infineon's official cross-reference list is the place to start for a pin-compatible drop-in.
Package and temperature grade
The 8-SOIC package (0.209" body width, 5.30 mm) is a standard footprint shared across many SPI NOR flash parts from multiple vendors. The -40°C to 85°C industrial temperature range covers most factory-floor and outdoor telecom enclosures; it is not rated for extended automotive under-hood or avionics hot-spot environments. Mounting is surface-mount only — no through-hole variant exists in this series.