The 3.5 ns access means the SRAM can deliver data within one clock cycle at 166 MHz (6 ns period) with margin, so a properly timed controller sees zero wait-state reads in a pipelined bus. The 512K x 18 organization suits 18-bit DSP datapaths or networking lookup tables where the extra two bits carry parity or tag information.
3.3 V supply and commercial temperature — where it fits
It is not rated for industrial floors, automotive under-hood, or outdoor enclosures.
Obsolete — sourcing and replacement reality
Cypress lists the CY7C1362B-166AJC as Obsolete. For new designs, a synchronous SRAM in the same 100-TQFP footprint from another vendor — such as a 9 Mbit or 18 Mbit device with matching 512K x 18 or 1M x 18 organization — should be evaluated for timing compatibility.
