This means the manufacturer no longer produces the part and no further last-time-buy windows are open. There is no direct Infineon-specified successor for this exact order code; any replacement must be evaluated for pin-compatibility and timing at the system level.
Access time is 55 ns. Write cycle time is also 55 ns, so read and write cycles are symmetric.
4K x 18 organization — data-width and buffer sizing
Memory size is 72Kbit organized as 4K x 18.
Industrial temperature and 5V-only supply
The supply range is 4.5V to 5.5V — strictly 5V nominal. It will not operate at 3.3V; any design migrating to lower-voltage logic must include level translation or select a different dual-port SRAM. The 100-TQFP package (14x14 mm) is a standard fine-pitch QFP, reworkable with conventional hot-air tools.