The code printed on an electronic component may contain less information than its full manufacturer part number (MPN). For surplus stock, record the complete orderable MPN from the original label or linked purchasing documents, and keep the observed body marking in a separate field. If you have only a short marking, keep the exact order code unconfirmed until the supporting information resolves it.
This matters on both sides of a transaction. A seller needs to describe the stock without guessing missing suffixes. A buyer needs to match the offered part to the approved BOM and understand the packaging being supplied.
Why the body marking can differ from the order code
Manufacturers have limited space on package bodies. Marking conventions can vary by device and package, and the printed text may include identification, date or lot information across several lines. Analog Devices describes a package-specific marking approach for the DS1804 family because the available marking area differs between packages. Its explanation illustrates why the applicable manufacturer's marking guidance matters. Analog Devices DS1804 marking note.
Keep these records distinct:
Record | What to preserve |
|---|---|
Full orderable MPN | Every character from the label or linked source document, including suffixes and punctuation |
Observed body marking | The text actually visible on the component, with line breaks or a clear photo |
Date and lot information | The codes as printed, with their source and any manufacturer-supported interpretation |
Internal stock code | Your warehouse or ERP reference, linked to the manufacturer identity |
Current packaging | The carrier and condition now offered, including cut tape or an opened partial reel |
A date or lot code belongs with the part identity; it does not replace the full MPN. For a separate explanation of those fields, see date codes and lot codes.
One marking can appear against different orderable part numbers
TI's package option addendum for the MSP430F11x2 and MSP430F12x2 family provides a concrete example:
Full orderable part number | Package and pins | Listed carrier | Listed part marking |
|---|---|---|---|
| TSSOP (PW), 28 pins | Tube |
|
| TSSOP (PW), 28 pins | Large tape and reel |
|
These are manufacturer documentation examples. Both rows list the same part marking, while the orderable numbers and carriers differ. The marking alone therefore cannot distinguish these two ordering options. TI also notes that additional markings can identify a logo, lot trace information or environmental category, so the table does not describe every character that may appear on a device. TI package option addendum, dated 14 June 2026, pages 2–3.
Use this example to check identification and packaging records. Any proposed change to an approved BOM still needs the buyer's engineering and purchasing review.
What sellers should record before offering a lot
Start with the physical stock and preserve the link between it and its documents. A spreadsheet entry copied from an old purchase order needs a connection to the particular reel, tube, tray or bag now being offered.
For each separately identified pack or lot:
Copy the full MPN and manufacturer from the original label or linked records. Keep any internal stock number in its own column.
Record the visible body marking if it is already accessible. Do not open sealed protective packaging just to obtain a photo for an initial list.
Retain label photos and the documents that link them to the stock. Keep the original images alongside any transcription.
Describe the current quantity, carrier and condition separately from the original ordering information. If a reel has been partly used, say so.
Mark unresolved identity fields as unknown. Record what needs checking instead of adding a likely suffix from an internet search.
If the label and body marking appear inconsistent, hold that row for clarification. Check the exact manufacturer documentation and package before deciding what the difference means. Keep the stock separate from rows whose identity has been resolved.
These fields extend a general surplus inventory list with the information needed to investigate a marking question. They do not require every seller to adopt a new file format.
What buyers should confirm before accepting the offered identity
Put the complete approved MPN in the RFQ or BOM. If alternatives are permitted, identify them explicitly and state who can approve a change. A family name or a short body code leaves room for the supplier and buyer to refer to different ordering options.
When the offered marking differs from your records, request the full label, a clear body photo where available, and the source used to connect them. Compare the exact package and ordering information in the manufacturer's documentation. TI provides a part marking lookup; use the manufacturer's applicable documentation to assess a result rather than treating a short code as a unique identity in every case.
Ask the supplier to distinguish the original orderable MPN from the current delivery format. Stock identified by a tape-and-reel order code may now be offered as a partial reel or cut tape. Confirm whether that actual format meets your assembly requirements before ordering.
Agree how unresolved differences will be handled before accepting a substitution or releasing the lot for production. A matching marking or label photo helps investigate identity; it does not establish authenticity, storage condition or electrical performance. Inspection and testing need an agreed scope for the specific lot. StockWake terms on product quality.
Common identification questions
Body marking differences and authenticity
A legitimate marking can differ from the full orderable number, as the TI example shows. Investigate the difference against the correct manufacturer, device and package information. A plausible marking also does not establish authenticity on its own.
Suffix differences between inventory rows
Preserve both full codes in your records. Check the manufacturer's documentation to understand the suffix difference, and use the buyer's approval process to decide whether a change is acceptable. If a shortened family reference helps searching, keep it in an additional field without replacing the exact MPN.
Missing original labels
Record the observed marking, package and available history. If the available records cannot link the physical stock to a complete orderable MPN, keep that MPN unconfirmed and seek supporting records or manufacturer clarification. Record the missing original label as a separate evidence gap. Do not present an inferred order code as a verified MPN.
Send the information relevant to your stock or requirement
Selling excess components? Submit your surplus list with the complete MPNs you can substantiate, quantities and current packaging. Use the notes to identify rows that need clarification.
Buying components? Send your BOM with full approved MPNs, quantities and any packaging or identification requirements. List permitted alternatives separately so that the requested part and any proposed change remain clear.