This means the part remains in Micron's standard production portfolio, and normal replenishment cycles apply. For BOM planning, there is no urgency to stockpile or qualify a substitute.
Why the peers in the ledger are not alternatives
Three Micron NAND Flash and NOR Flash parts (MT29F4G08, MT29F1G08, MT25QU256) are listed as peers. These are non-volatile memories with different interfaces and supply voltages. None is a functional replacement for a synchronous SRAM.
