Source the precise legacy ordering code
Preserve revision, package, speed and temperature suffixes. State the accepted condition, date-code restrictions and evidence requirements. Published lifecycle status does not establish whether usable supply exists.
Evaluate evidence for each lot
Discuss provenance, packaging, storage and testing before purchase. No stock, authenticity result or traceability level is guaranteed by a directory listing.
Build an engineering comparison
Compare density, organization, voltage, pinout, timing, package, host support and firmware behavior. A cross-reference is a candidate for investigation, not an approval.
Plan a controlled transition
Qualify samples and application behavior with your engineering team before production release. Ask for a sourcing review with your complete legacy MPN and demand schedule.