SMD marking code “4R” — 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 | |
|---|---|---|---|---|
| 2SA1721-R | TOS | SOT-23 | Public marking directory | |
| IMP162REUS | IMP* | SOT-143 | Public marking directory | |
| MMBV3700 | MOT | SOT23 | Public marking directory | |
| MMSZ6V2 | ON | SOD-123 | Public marking directory | |
| RQ5RW44CA | RICOH* | SOT-143R | Public marking directory | |
| KIA7445F | — | SOT-89 | Public marking directory | |
| MM1Z6V2 | — | SOD-123 | Public marking directory | |
| MMVL3700 | — | SOD-323 | Public marking directory | |
| R1210N341A | — | SOT-23-5 | Public marking directory | |
| R3131N30BA8 | — | SOT-23 | Public marking directory | |
| SRA2204E | — | SOT-523 | Public marking directory | |
| SRA2204EF | — | SOT-523F | Public marking directory | |
| SRA2204U | — | SOT-323 | Public marking directory | |
| SRA2204UF | — | SOT-323F | Public marking directory | |
| XC6127N39ENR | — | SSOT-24 | Public marking directory | |
| XC6221D301NR | — | 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.
Can't match your marking?
Send us the code, package and a photo — our team helps identify the part.
Ask our team