Micron Legacy DRAM EOL Reaches Its October 22 Last-Order Milestone Under Revised PCN 36397
Micron PCN 36397 reached its published Last Order Date on October 22, 2026, for four select DDR3, LPDDR2 and LPDDR3 part numbers. This is the execution of a notice first published on April 22 and revised on June 15, not a new EOL announcement issued on October 22. The revision restored support for one previously listed part and left only one of the four affected parts with a named recommended replacement. The document supports part-level order and NCNR reconciliation, while offering no evidence of a shortage, price increase or available inventory.
The transition from advance notice to order cutoff
Micron PCN 36397 has reached the lifecycle milestone that matters for current order control. The company published the original notice on April 22, 2026, and issued Revision 1 on June 15, explicitly stating that the revision superseded the original. The document lists October 22, 2026, as the Last Order Date and April 22, 2027, as the Last Ship Date. Accordingly, October 22 should be recorded as the scheduled last-time-buy endpoint under an existing PCN, not as the date on which Micron made a new discontinuation announcement. That distinction preserves the chronology required for supplier-notice tracking and prevents an execution milestone from being reported as fresh market news.
The PCN describes the action as an End of Life change driven by Manufacturing Efficiency. Its product scope is select DDR3, LPDDR2 and LPDDR3 components associated with DIDs V89C, U07M, V00H and V01M. Micron lists All Sites as affected and identifies products through the Marketing Part Number. This framing keeps the event at the orderable-part level. It does not support a conclusion about every Micron legacy DRAM device or the wider DDR3, LPDDR2 and LPDDR3 markets.
The final scope after Revision 1
Four orderable Micron part numbers remain affected after the revision: MT41K128M16JT-125 XIT:K; MT41K512M8DA-093:P; MT42L16M32D1HE-18 AAT:E; and MT52L256M64D2FT-107 WT:B. The PCN names MT41K128M16JT-125 IT:K as the recommended replacement for the first part. For each of the other three, the replacement field directs the customer to a Micron Account Representative rather than identifying a substitute part number. The document separately advises contacting Micron regarding replacement compatibility, roadmap visibility and last-time-buy support. It does not state that any alternative can be inserted without qualification, validation or commercial review.
Revision control materially changes the scope. Micron says it will continue supporting MT41K512M16VRP-107 AAT:P, a part that appeared in the earlier affected list. Revision 1 displays that row as redlined and says it is no longer reflected in the affected-part list. No other change was made to the PCN. An internal lifecycle record based only on the April notice could therefore create a false EOL status for a part that Micron subsequently restored to support. The revised file should govern any part-number comparison, while the original publication date remains part of the event history.
NCNR exposure and the shipment horizon
The order cutoff is only one element of the control timeline. Micron establishes July 24, 2026, as the NCNR Date and states that affected-product orders not shipped as of that date are non-cancelable, non-reschedulable and non-returnable. If additional supply becomes available after the NCNR Date and Micron accepts further orders, those orders are also subject to NCNR terms. The stated exception covers warranty returns made in compliance with Micron’s RMA procedures. The PCN does not quantify additional supply, promise acceptance after the Last Order Date or describe any channel inventory that may remain available.
April 22, 2027, remains the published Last Ship Date. That date provides a shipment horizon for accepted orders, but it is not a guarantee that every requested quantity will be accepted or that every order will retain scheduling flexibility. The document’s terms instead narrow the relevant review to confirmed orders, unshipped balances, acknowledged schedules and applicable NCNR status. This is a record-reconciliation exercise grounded in the supplier notice, not a forecast of spot availability.
Procurement controls supported by the PCN
The notice supports a focused set of checks across BOM, approved-vendor and order records. The exact Micron marketing part number can be matched against the four-part revised scope; the BOM revision can establish where the device remains designed in; purchase-order records can separate accepted quantities from unplaced demand; shipment acknowledgements can identify open balances extending toward the Last Ship Date; and NCNR status can be reconciled against the July 24 trigger. Replacement records can also distinguish the one named recommendation from the three parts for which Micron provides no replacement number in the PCN. These actions verify the documented lifecycle state without assuming broader market conditions.
The restored part requires its own exception control. MT41K512M16VRP-107 AAT:P should not inherit the EOL status of the four affected parts simply because it appeared in an earlier version of the notice. Conversely, adjacent density, package or suffix variants should not be treated as affected unless their complete marketing part numbers are within the revised scope. The PCN’s use of exact part numbers and its Marketing Part Number identification method make suffix-level matching central to an accurate lifecycle record.
The boundary between EOL and market availability
PCN 36397 provides no price, quoted lead time, distributor stock level, allocation rate or shortage statement. It therefore cannot establish that legacy DRAM prices have risen, that channel inventory is exhausted or that all devices in the named memory generations face the same supply condition. An EOL plan can create procurement exposure for designs that still contain the affected parts, but the exposure in this document is defined by lifecycle dates, accepted-order terms and replacement status. Any conclusion about current market availability or price requires separate evidence outside this PCN.
The defensible reading is narrow and operational. Four select part numbers remain within Micron’s EOL scope, one previously listed part has returned to supported status, the Last Order Date occurred on October 22, and the Last Ship Date is April 22, 2027. Orders covered by the July 24 NCNR trigger carry the stated restrictions. Those facts justify part-level reconciliation and supplier confirmation; they do not justify a general shortage or price-increase narrative.