A top marking that differs from the expected text deserves investigation, but it does not immediately prove that a component is wrong or counterfeit. Small packages often use abbreviated codes, and approved variants can have different markings. Preserve the material identity while checking the discrepancy.
TI’s part-marking lookup allows searches using package markings or TI part numbers. Use the corresponding manufacturer resource for other brands and verify the exact package and orderable option rather than relying on an unrelated image search.
Collect the evidence before handling changes it
Photograph the marking clearly with package orientation visible and sufficient resolution to distinguish similar characters. Record the received quantity, original label information, supplier, and purchase reference. Keep the disputed material separated under the normal receiving-control process until the responsible reviewer determines its status.
Compare the full ordered number with the delivered label first. Then compare the observed marking with documented possibilities for that identity. A matching family code does not establish temperature grade, packing option, or every other attribute of the purchased part.
Resolve possible explanations systematically
| Observation | Next check |
|---|---|
| Abbreviated marking differs from full part number | Manufacturer marking table or lookup |
| Label number differs from purchase order | Approved alternate and shipment documentation |
| Several markings within a receipt | Carrier and lot separation plus documented permitted variation |
| No documented match | Manufacturer or authorized supplier clarification |
Do not remove, polish, or alter markings to improve readability. If examination needs a specialized method, preserve representative evidence and obtain the appropriate review. Changes to the sample can make later analysis harder.
Keep identification separate from qualification
- Establish the most supportable component identity.
- Verify the supply-chain and label records.
- Check whether that exact identity is approved for the BOM.
- Define additional examination or testing if required.
- Record the disposition and affected material population.
A successful electrical spot check is not proof of authenticity or complete specification compliance. Likewise, a cosmetic mismatch does not establish a failure mechanism. Choose tests to answer a defined question and retain their limitations in the conclusion.
When the manufacturer confirms a valid marking variation, update the receiving reference with the supporting communication and applicable scope. Avoid turning a one-lot clarification into a universal rule for all packages. If the result remains unresolved, keep that uncertainty explicit rather than selecting the closest-looking database entry.
The orderable suffix guide helps distinguish a legitimate approved option from an unreviewed substitution that happens to share the same device family name.
Move from reading to a build-ready project
Use the fabrication and assembly checklists to prepare drawings, production files and test requirements.
Open the DFM checklist