512 KB Flash and 98 KB RAM — what fits
The LPC2468FBD208K: 512 KB of program Flash is enough for a TCP/IP stack, a file system, and a modest application layer without external memory. The 98 KB SRAM handles Ethernet frame buffers and USB endpoint data; if the application runs heavy graphics or large data logs, you will need external SDRAM or SRAM on the EBI/EMI bus. For most control-and-communicate tasks, the on-chip RAM is sufficient.
Active and available — no lifecycle pressure
For a BOM that is already qualified on this part, there is no urgency to find a drop-in replacement. If you are evaluating a new design, the LPC2400 family has higher-density siblings, but this exact code remains a supported production part.