0.45 ns access — cache/tag RAM fit
The R1QDA7218ABG-20IB0 is a standard SRAM organized 4Mx18 with a 0.45 ns access time. That access time puts it in the class used for high-speed cache, tag RAM, or lookaside buffers where the processor cannot wait a full cycle for data. The 18-bit word width aligns with 18-bit parity or ECC buses common in networking and telecom line cards.
Active lifecycle — no end-of-life flags
Renesas lists the product status as Active. Bulk packaging means it ships as loose units rather than tape-and-reel — typical for engineering samples, prototype runs, or low-volume production where reel quantities are unnecessary.
For a BOM line that calls out this exact density and speed grade, the 0.45 ns access and 4Mx18 organization are the fit criteria; confirm the word width and package footprint against the board layout before committing.