How to Confirm a Micron Memory Part From Its FBGA Marking
Read the complete top mark, enter its short code in Micron's official decoder, then check the returned full part number against the technical record and the actual lot. A Micron FBGA marking can identify a candidate device. It cannot, by itself, approve a replacement or prove that offered stock is genuine and unused.
What Can a Micron FBGA Marking Confirm—and What Can It Not Prove?
Have only a chip photo? Preserve the image and establish the candidate manufacturer part number (MPN).
Replacing a board component? Compare the electrical specification, ball map and controller support before ordering.
Buying a lot? Add source, condition, handling and lot-level evidence. An identification match is not a material-release decision.
| Current condition | Recommended action | Evidence required | Stop boundary |
|---|---|---|---|
| One or more characters are unclear | Retake and preserve the marking photos before searching. | Full top mark, package orientation, overview image and original-resolution close-up. | Do not confirm an MPN from a guessed character. |
| The decoder returns a candidate MPN | Save the result, reverse-check it and open the exact technical record. | Complete returned MPN, lookup date, datasheet and package drawing. | Do not call the part compatible from the code match alone. |
| A seller offers a physical lot | Connect the identified MPN to the offered label, lot and source records. | Lot-linked photos, declared condition, traceability and agreed inspection scope. | Do not release material when identity, condition or chain of custody is unresolved. |
| Any record conflicts | Segregate or hold the candidate and reconcile the exact disagreement. | Original photos, both conflicting records, owner and documented disposition. | Do not choose the result that merely fits the intended purchase. |
Which Line Is the Micron FBGA Marking Code?
FBGA means fine-pitch ball grid array. Small packages often cannot display the complete part number, so the marking uses a compact identifier. Read it as a lookup key, not as a miniature datasheet.
Does the five-character code contain only numbers?
Micron's decoder instructions call this a five-digit code. The examples here show that letters are part of the code: D9WFH and NW361. Preserve all five characters. Do not add the nearby Micron logo to the search field.
The official page directs readers to the second five-character sequence, typically near an MT mark. Use that as a locating aid, then check the applicable marking layout. Legacy Elpida-marked products and different package arrangements need their own interpretation.
References: Micron FBGA decoder instructions; CSN-11, Rev. BF, May 2026, pages 3–6.
Which photos preserve enough marking evidence?
Keep one overview showing the board reference or carrier, then one sharply focused top view with every marking line visible. For loose inventory, link the photos to the declared lot and packaging label. A downloaded sales image is not evidence of the units being offered.
Use lighting from more than one angle if a laser mark disappears in glare. Record an uncertain character as uncertain; do not silently turn 0 into O or 8 into B. Keep the original photo alongside any transcription.
For moisture-sensitive material, agree a controlled opening and resealing procedure before breaking dry packaging solely to obtain a photo.
| What you see | What to do with it | What not to conclude |
|---|---|---|
| Abbreviated part code | Look up the exact characters and retain the full returned MPN. | That the string alone specifies compatibility or origin. |
| Upper marking line | Preserve the date/manufacturing context and compare the relevant CSN-11 layout. | That it is another orderable part number. |
| Logo and orientation mark | Record the package orientation for the drawing and ball-map check. | That a familiar logo authenticates the physical device. |
| Carrier or module label | Determine whether it identifies loose components or a complete assembly. | That every label must literally repeat the IC's decoded MPN. |
How Should You Use Micron's Official FBGA Decoder?
Keep the original observation separate from the lookup result. That makes a wrong transcription easier to find and a supplier discrepancy easier to explain.
Capture and transcribe
Record the full mark, the five-character lookup code, board reference or lot identifier, and photo filenames. If one character is not legible, pause identification and improve the evidence.
Search the code
Open Micron's official decoder. Use the FBGA Code field and select SEARCH. Wait for the result table; a page that has not finished loading is not evidence that a code is invalid.
Save the exact returned MPN
Copy every character, including speed, temperature and revision information where present. Save the result and lookup date in your review record. Do not shorten the number to its memory family.
Reverse-check the result
Select RESET, enter the full MPN in Part Number, and search again. Check that the observed code appears. If multiple rows are returned, preserve all of them and resolve the applicable variant.
Open the technical record
Follow the part-detail link. Obtain the exact datasheet, package drawing and applicable revision. Check status separately: historical lookup records can remain available for obsolete devices.
Make the appropriate decision
For repair, route the candidate through engineering comparison. For procurement, reconcile the lot evidence as well. Record unresolved differences as a hold, with an owner and a specific question to resolve.
The two search directions are provided by Micron's official tool. The recordkeeping and approval sequence above is a practical review workflow, not a Micron certification procedure.
What Do Real Micron Codes D9WFH and NW361 Identify?
These examples combine openly licensed photographs with live manufacturer lookups. They are not accounts of YURUNOX shipments, customer repairs or laboratory tests.
What does D9WFH confirm—and what remains open?
The photographed chip has 80E75 above D9WFH. Searching the lower code gives this complete result:
MT40A512M16LY-075:EMicron FBGA and component marking decoder
Micron's part-detail record identifies an 8Gb, x16 DDR4 device. It lists 1.2 V I/O, 2666 MT/s, a 96-ball TFBGA package and a 7.50 × 13.50 × 1.20 mm outline. Its displayed status is Obsolete.
Inspect Micron's exact D9WFH part record.
Which claims does the D9WFH lookup support?
The lookup establishes a specific code-to-number relationship. The catalog then provides a specification summary. Neither step verifies the physical silicon shown in the photo, nor does it prove that an unrelated seller holds identical material.
Notice the difference between 8Gb and 8GB. The first is gigabits at component level; it is not an 8-gigabyte module. Also keep -075:E in the record. A quotation that stops at MT40A512M16 has omitted information needed to identify the exact variant.
Which limits require the datasheet rather than the catalog?
The same record lists a temperature range of 0 to 95°C. Do not relabel that as allowable surrounding-air temperature without reading the datasheet's temperature definition and operating conditions. Refresh requirements and thermal limits belong in the engineering review.
The public part page provides a datasheet access route, which may require a Micron account. If your team cannot obtain the applicable document, keep technical confirmation open instead of treating the summary fields as a substitute.
NW361 marking demonstrates why searching only for a D9 prefix is too narrow. Photo © Raimond Spekking / CC BY-SA 4.0 (via Wikimedia Commons). Resized; otherwise unchanged.What does NW361 identify—and why does the memory type matter?
The second photograph shows 6NE1D and NW361. The manufacturer lookup returns:
MT29F1G08ABAEAH4:EMicron FBGA and component marking decoder
The linked record identifies 1Gb, x8 SLC NAND flash, with 3.3 V I/O, a 63-ball VFBGA package and a 9.00 × 11.00 × 1.00 mm outline. It also displays Obsolete.
Inspect Micron's exact NW361 part record.
Why Can a Module Label Differ From the Chip Part Number?
Before calling a mismatch suspicious, ask whether you are comparing a component with a component—or a component with an assembled memory module.
How should the chip and module records be separated?
The photographer's companion image shows the complete SO-DIMM carrying the chip pictured above. Its label reads MTA4ATF51264HZ-2G3E2 and 4GB 1RX16. That module number is different from the decoded IC number MT40A512M16LY-075:E, as expected for two different product levels.
Buying the complete module? Specify the full module number and confirm platform support, rank, capacity, speed and physical form factor.
Buying loose replacement ICs? Control the decoded component MPN, package and board requirements. A module label alone is not the loose-chip ordering specification.
Which Three Decisions Must Remain Separate?
What does the code map to?
Evidence: a readable mark, an official lookup and the exact part record. Output: a candidate MPN with the observation preserved.
Will this exact part work here?
Evidence: datasheet comparison, ball map, power rails, controller and firmware support, plus validation appropriate to the change.
Is this offered lot acceptable?
Evidence: the agreed source, condition, label/lot connection, handling history and inspection results against written acceptance criteria.
This three-gate structure is a review aid. No gate is an automatic guarantee of authenticity, system reliability or regulatory compliance.
What Must Engineering Compare After the Decoder Returns an MPN?
A similar package can hide a different interface or organization. Build the comparison around the approved BOM and board, not the seller's description of an “equivalent.”
On a phone, scroll the table sideways to review all columns.
| Check | Evidence to compare | Reason to keep the candidate on hold |
|---|---|---|
| Technology and interface | Exact memory family, controller specification and supported device list. | The expected DDR/LPDDR generation or NAND interface is not confirmed. |
| Density and organization | Total bits, x4/x8/x16/x32 width as applicable, address mapping and device count. | The capacity appears right but the bus width or controller addressing differs. |
| Electrical limits | Recommended supply and I/O conditions, reference/termination requirements and board rails. | The package fits but the voltage requirements do not. |
| Timing and initialization | Guaranteed timings, data rate, controller settings and firmware support. | A faster-looking speed grade is being used to skip timing or training review. |
| Package and ball map | Drawing, pitch, dimensions, height, ball assignments and land pattern. | Only the outline or ball count has been compared. |
| Temperature and revision | Exact suffix, temperature definition, operating conditions and applicable changes. | A family-level datasheet or reseller temperature label is the only evidence. |
| Flash-specific behavior | Page/block geometry, ECC needs, bad-block handling and boot/controller compatibility. | The proposed NAND replacement is selected on density alone. |
| Lifecycle and supply | Current manufacturer status, change/discontinuance notices and an acceptable sourcing route. | A valid decoder entry is being treated as proof of availability. |
Can equal memory density still hide a different organization?
For a simple illustrative comparison, 512M words × 16 bits and 1G words × 8 bits both represent 8Gb of storage. They do not expose the same number of data bits per device. The organization still has to fit the board and controller.
Likewise, a single x16 IC is not automatically interchangeable with a pair of x8 ICs. A capacity calculation cannot approve a ball map, layout or firmware change.
Which records must stay tied to the approved MPN?
Store the datasheet revision, exact ordering line and relevant package drawing with the approved comparison. If a supplier offers a different suffix after the review, reopen the affected checks instead of silently editing the purchase order.
Micron's packaging and part-numbering resources provide the route to the relevant family documentation. Codes and suffix meanings should be read in that family context, not transferred from another memory product.
Which Evidence Should Change the Identification or Buying Decision?
The following are illustrative scenarios, not reported YURUNOX customer experiences. Each names the evidence that is missing and the next action it requires.
A readable chip, but no reliable BOM
Situation: a technician can read D9WFH on a failed board. A seller offers any 8Gb DDR4 IC as a replacement.
Review: decoding identifies the x16 candidate. Engineering still needs the package drawing, board rail information and controller/firmware configuration. The failed device's identity does not prove that memory caused the fault.
Decision: request an exact-MPN quote while the repair diagnosis and compatibility checks continue. Do not approve the broad “8Gb DDR4” substitution.
The code matches, but the source record is incomplete
Situation: a surplus offer includes a clear close-up and a matching decoder result. The packaging photo has no link to the offered lot, and condition is described only as “original.”
Review: ask whether the material is unused, recovered, reballed, split or repacked; require the seller's source declaration and lot-linked photos.
Decision: hold commercial approval until the evidence meets the program's rules. A correct short code cannot fill gaps in chain of custody.
One carton contains inconsistent component marks
Situation: sampled units from a loose-component shipment show two different lookup codes, but the delivery paperwork states one exact MPN and one lot.
Review: identify and segregate the observed groups under the receiving procedure. Decode each group and request a lot map and corrected explanation. Different date marks alone are not the same issue as different part codes.
Decision: keep release on hold until the discrepancy is resolved. Do not extrapolate one passing sample to the entire carton.
What Should You Do When the Decoder or Records Disagree?
| Symptom | Check first | Next action |
|---|---|---|
| No result table appears | Page loading, selected field, exact characters and whether the search completed. | Retry after the page is ready. An unavailable service is not a counterfeit finding. |
| A completed search has no match | Wrong marking line, unreadable character or a different/legacy marking format. | Retake the photo; consult the applicable marking guide or Micron support. Do not turn guessed characters into a confirmed identity. |
| Several candidate results | Whether the input is complete and whether each row has different suffixes or options. | Retain all results. Reconcile the full mark, exact label and technical record before selecting one. |
| Decoded MPN differs from label | Loose-chip label versus assembly label; exact lot connection; transcription accuracy. | Explain assembly-level differences first. Hold unresolved component-to-component conflicts. |
| The mark differs from a web photo | Image quality, package version and applicable official marking format. | Request documented clarification. Visual difference alone is not a conclusive authenticity test. |
| Part record is obsolete | Exact status, required service life, allowed supply route and alternate authority. | Agree an existing-design sourcing plan or an engineering-approved redesign route. |
What Should Happen After the Decoder Returns a Result?
The next action depends on the evidence state and the decision being made. The table keeps those branches visible without implying that a page selector can approve a component or release a lot.
| Evidence state and purpose | Required next action | Evidence to retain | Do not proceed when |
|---|---|---|---|
| Mark unclear or completed search has no match | Improve the photograph, recheck every character and consult the applicable marking layout. | Original image, transcription with uncertain characters identified and search date. | The MPN depends on a guessed character or unfinished search. |
| Official result saved for identification | Reverse-check the full MPN and preserve the code-to-part result with its limits. | Complete top mark, returned MPN, lookup date and exact part record. | The result is being extended into an authenticity or compatibility claim. |
| Official result saved for board repair | Compare the exact part with the circuit, controller, firmware and confirmed fault diagnosis. | Datasheet revision, package drawing, ball map, rails, timing and engineering disposition. | The diagnosis is incomplete or any electrical, package or firmware difference is unresolved. |
| Official result saved for purchase or receiving | Connect the identity result to the offered or delivered lot and the agreed inspection plan. | Supplier declaration, condition, lot-linked label and device photos, traceability and inspection results. | The source, condition, lot link or acceptance evidence does not meet the written requirement. |
| Any result conflicts with another record | Hold or segregate the material and reconcile the disagreement before approval. | Both records, original photos, supplier explanation, review owner and final disposition. | The difference is being dismissed as a typo without documented evidence. |
What Should a Micron Identification and Sourcing Request Include?
A useful request distinguishes what you observed, what Micron returned, what your design needs and what supply conditions you accept.
MICRON MEMORY IDENTIFICATION / SOURCING REQUEST Observed top marking (all lines): FBGA code and any uncertain characters: Full MPN from official decoder: Lookup date / saved result: Required BOM MPN and approved revision: Purpose: identification / board repair / production purchase Required quantity and delivery date: Package, organization, voltage and speed requirements: Application temperature / qualification requirements: Approved source route and acceptable condition: Date-code, lot and packaging requirements: Available photos: device / board or carrier / original label Required traceability and inspection evidence: Known mismatch or missing document: Please disclose any different MPN, suffix, revision, condition, repacking or mixed-lot proposal separately. No substitution without written approval.
Before the purchase order
Agree the complete orderable configuration, condition, approved source route, quantity, packing, lot/date policy and no-substitution rule. Where authenticity risk warrants testing, agree the scope, sampling and acceptance criteria before shipment, not after a discrepancy appears.
If an authorized channel is mandatory, confirm it against Micron's authorized distributor directory. Do not treat an independent sourcing quote as proof of manufacturer authorization.
At receiving
Match the delivered labels and selected physical units to the PO and approved evidence file. Retain the decoder result, datasheet revision, photos and inspection disposition. Segregate material with unresolved discrepancies using your quality procedure.
ESD precautions, moisture controls and storage history remain relevant after identity is established. A fresh label or a recent-looking date code cannot retrospectively prove proper handling.
Send YURUNOX the marking photos, any decoder result and the intended use. As an independent component sourcing partner, YURUNOX can discuss the exact-part requirement and the evidence needed for the offered supply. Manufacturer identity, engineering approval and lot acceptance remain separate checks.
Which Original Sources Should Be Checked Before Approval?
Manufacturer sources support the marking guidance and the two identified device records. The procurement workflow and clearly labeled scenarios are practical interpretation, not manufacturer-issued acceptance rules.
- Micron FBGA and component marking decoder — code-to-MPN and reverse searches; both worked examples checked August 26, 2026.
- Micron CSN-11, Rev. BF, May 2026 — component marks, manufacturing information and package-layout differences, especially pages 3–6.
- MT40A512M16LY-075:E — exact DDR4 catalog record. Specification summary and status checked August 26, 2026.
- MT29F1G08ABAEAH4:E — exact SLC NAND catalog record. Specification summary and status checked August 26, 2026.
- Micron packaging and shipping information — marking, packaging and family part-numbering resources.
- Micron authorized distributors — manufacturer-maintained channel reference.
Photo credits and license links accompany each image. External catalog status and document access can change. This guide does not claim Micron endorsement, authorized-distributor status or testing of the pictured devices.