256Kbit asynchronous SRAM in a 28-SOJ — what this part is
The CY7C199CN-15VXC is a 256Kbit asynchronous SRAM from Cypress, organized as 32K words by 8 bits. It is housed in a 28-SOJ (Small Outline J-lead) surface-mount package, a common footprint for late-1990s through 2000s memory designs.
15 ns access time — bus timing margin for legacy controllers
15 ns access time per the datasheet.
Any stock you find is new-old-stock or surplus from independent distribution. For a production BOM, this is a last-time-buy or broker-sourced line. If you need a drop-in replacement, the search is for a pin-compatible 32K x 8 async SRAM in a 28-SOJ package with 15 ns or faster access time and 5 V supply — several vendors (ISSI, Alliance, Lyontek) offer functionally equivalent parts, but always verify the pinout and timing against your existing layout.
Because the CY7C199CN-15VXC is obsolete, it is not stocked by the manufacturer. We source it through our independent distribution network — surplus inventories, overstock, and verified broker channels. Each unit is date-code checked and visually inspected before shipment. If you have a volume requirement or a specific date-code window, include that in your request so we can match the supply to your production schedule.