128K x 8 standard SRAM — device identity and fit
The M5M51008DKV-70HIST is a standard SRAM organized as 128K words by 8 bits, delivering 1 Mbit of volatile storage with fast random access — the 70 ns access time (implied by the -70 speed grade) suits cache or scratchpad duty in embedded systems where latency matters more than density.
Active lifecycle and sourcing posture
Renesas Electronics lists this part as Active in production, so it remains a valid BOM line for new builds and legacy maintenance without last-time-buy pressure.
Supplied in Bulk packaging, the device is typically a DIP or SOP footprint — the exact package outline should be verified against the board land pattern before committing the PCB layout.