SMD marking code “1B” — 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 | |
|---|---|---|---|---|
| BC846B | NXP | SOT-23 16ta - 3a PhH | Public marking directory | |
| BC846BT | PHI | SOT-416 | Public marking directory | |
| BC846BT | PHI | SC-75/ SOT416 | Public marking directory | |
| BC846BW | PHI | SOT-323 16ta - 3a PhH | Public marking directory | |
| BC846BW | DIODES | — | Public marking directory | |
| BC847A | MCC | SOT-23 | Public marking directory | |
| BU4342F | ROHM* | SOP-4 | Public marking directory | |
| BU4342FWE | ROHM* | VSOF-5 | Public marking directory | |
| BU4342G | ROHM* | SSOP-5 | Public marking directory | |
| FMMT2222 | FERRANTI | SOT23 | Public marking directory | |
| IRLML2803 | IR INTERNATIONAL RECT. | SOT-23 | Public marking directory | |
| KST2222 | FSC | SOT-23 | Public marking directory | |
| MA2J111 | PANASONIC | SOT-346 | Public marking directory | |
| MMBT2222 | ON | SOT-23 | Public marking directory | |
| R3111N111A | RICOH* | SOT-23-5 | Public marking directory | |
| RH5RL21AA | RICOH* | SOT-89 | Public marking directory | |
| RN5RL21AA | RICOH* | SOT-23-5 | Public marking directory | |
| RQ5RW19BA | RICOH* | SOT-143R | Public marking directory | |
| SMBT2222 | SIEMENS | SOT-23 16ta - 3a Inf | Public marking directory | |
| UNRF1A3 | PANASONIC* | — | Public marking directory | |
| YTS2222 | TOS | SOT-23 | Public marking directory | |
| 2N2222 | — | SOT-23 | Public marking directory | |
| BC846B9 | — | SOT-23 | Public marking directory | |
| BC846BDW | — | SOT-363 | Public marking directory | |
| R1161D111A | — | — | Public marking directory | |
| R3131N21EC | — | SOT-23 | Public marking directory | |
| R3132Q21EA | — | SOT-143 | Public marking directory | |
| R5326N002A | — | SOT-23-6 | Public marking directory | |
| RN5VD11CA | — | SOT-23-5 | Public marking directory | |
| TMPT2222 | — | SOT-23 | Public marking directory | |
| XC6127N17BNR | — | SSOT-24 | Public marking directory | |
| XC6217C122NR | — | SSOT-24 | Public marking directory | |
| XC6221C491NR | — | SSOT-24 | 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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