Obsolete dual-port SRAM — last-time-buy reality
The CY7C138-25JXC is officially classified as Obsolete by Infineon Technologies. This means the manufacturer has ceased production and no further last-time-buy windows are open. Sourcing this part now runs through independent distribution channels — surplus inventory, broker networks, and verified stock lots. Availability and pricing are confirmed per RFQ; no ongoing factory supply exists.
32Kbit dual-port — 25 ns access, 4K x 8 organization
Organized as 4K words by 8 bits, this asynchronous dual-port SRAM provides two independent access ports with separate address, data, and control lines — both ports can read or write any memory location simultaneously, with arbitration logic handling contention. The 25 ns access time and 25 ns write cycle define the bus timing budget: at 40 MHz equivalent, the address-to-data valid window is tight enough for mid-speed DSP or microcontroller shared-memory interfaces, but not for high-throughput video or networking buffers.
68-PLCC J-Lead — surface-mount footprint
Housed in a 68-lead PLCC (J-Lead) package, supplier device package code 68-PLCC (24.23x24.23 mm). The J-lead gull-wing alternative is a surface-mount footprint with a 1.27 mm pitch — standard for mid-1990s through early-2000s memory designs. Supplied in Tray packaging, typical for PLCC devices destined for pick-and-place assembly. The J-lead form factor is less common in new designs but still supported by most reflow profiles.