The Infineon CY7C199CNL-15VXCT is a 256Kbit asynchronous SRAM organized as 32K x 8, with a 15 ns access time that lets it keep pace with legacy 5 V CPLDs, 8-bit microcontrollers, and DSPs running at clock rates up to roughly 33 MHz without inserting wait states. The 15 ns write cycle time matches the read access, so back-to-back byte operations on a shared address/data bus don't need extra dead cycles. This part is a direct drop-in for the original Cypress CY7C199 family, which Infineon now owns.
Infineon no longer manufactures the CY7C199CNL-15VXCT in volume; there is no active factory lead time. The only supply channel is independent distribution — surplus inventory, new-old-stock, or broker-sourced material. For a 5 V, 28-SOJ, 15 ns replacement, the buyer will need to qualify a second-source SRAM from a different manufacturer — ISSI, Alliance Memory, or Renesas all make functionally equivalent 32K x 8 asynchronous SRAMs in the same footprint.
28-SOJ footprint — board-fit check
It is surface-mount only — no through-hole equivalent. The SOJ body is narrower than a 28-pin SOIC, so the footprint is specific: verify the existing PCB land pattern matches the SOJ outline before assuming a drop-in. The Tape & Reel (TR) suffix on this order code means it ships on a 13-inch reel, typically 1000 or 1500 pieces per reel, for automated pick-and-place.