128K x 8 asynchronous SRAM, 15 ns access
The CY7C109B-15ZXC is a 1 Mbit asynchronous SRAM organized as 128K x 8 bits, with a 15 ns access time and a 15 ns write cycle time. That means it is specced for office or lab ambient, not an unventilated enclosure or outdoor cabinet. Packaged in a 32-TFSOP (0.724", 18.40 mm width) — the 32-TSOP I footprint. The supplier device package is 32-TSOP I, the same body. Bag packaging, not tape-and-reel, so expect loose units for prototype or low-volume builds.
Obsolete — spot-market sourcing only
Infineon lists the CY7C109B-15ZXC as obsolete. Each lot is date-code and quantity confirmed at quote time. No pin-compatible second-source or drop-in replacement is recorded in the manufacturer's cross-reference data.