Any stock on the market is surplus, NOS (new old stock), or broker-handled — traceability and date-code consistency matter.
The 20 ns access time means this SRAM can complete a read or write cycle in 20 ns, which supports bus speeds up to roughly 50 MHz without wait states in a synchronous system. For async designs, it sets the window for address-to-data valid — critical for timing closure when the memory sits on a shared bus with a CPU or FPGA that expects fast random access.
512K x 8 organization and supply range
Organized as 512K words of 8 bits each, this part provides a byte-wide data bus — common for 8-bit microcontrollers, boot memory, or FPGA configuration storage.
Package and footprint: 36-SOJ
The 36-SOJ (Small Outline J-lead) package has a body width of 10.16 mm (0.400 inches) and is surface-mount. The J-lead form factor gives a smaller footprint than a DIP but still allows visual inspection of solder joints.