SMD marking code “Q4” — candidate parts
Small packages rarely print the full part number. The marking below maps to these part numbers — verify against the package, pin count and the manufacturer's datasheet before ordering.
Candidate part numbers
| Part number | Manufacturer | Package | Mapping basis | |
|---|---|---|---|---|
| 2SC2813-4 | TOS* | CP 16ta - 3a San | Public marking directory | |
| MMBC1321Q4 | MOT | — | Public marking directory | |
| 2SC1321-4 | — | SOT-23 16ta - 3a Nec | Public marking directory | |
| ELM7644HBB | — | SOT-23 16vdc VD7 3d Elm | Public marking directory | |
| KA4F3P | — | SC-75 | Public marking directory | |
| R3130N30AA8 | — | SOT-23 | Public marking directory | |
| R5210N002C | — | SOT-23-6W 33dc1 7d - | Public marking directory |
How these mappings are compiled: from public SMD marking directories and from our own stock records (marked Stock-record verified). We keep the original reference of every row internally so any mapping can be traced on request.
Markings are indicative only: the same code can denote different parts across manufacturers and packages. Always confirm with the physical batch marking and the original datasheet.
* Manufacturer derived from the part-number family (some directory entries carry no manufacturer) — treat it as a lead, not a datasheet fact.
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