SMD marking code “1Y” — 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 | |
|---|---|---|---|---|
| BF823 | PHI | SOT-23 | Public marking directory | |
| KST3903 | FSC | SOT-23 | Public marking directory | |
| MMBT3903 | MOT | SOT-23 | Public marking directory | |
| UNRF2A6 | PANASONIC* | — | Public marking directory | |
| CMBT3903 | — | SOT-23 | Public marking directory | |
| MM3Z7V5 | — | SOD-323 | Public marking directory | |
| R1210N511C | — | SOT-23-5 | Public marking directory | |
| XC6127N51BNR | — | SSOT-24 | Public marking directory | |
| XC6217C292NR | — | SSOT-24 | Public marking directory | |
| YTS3903 | — | SOT-23 | 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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