PNDS / Marking codes / 2N

Identify an unknown SMD part: marking code “2N”

Packages rarely print the full part number. The marking below is shared by several part numbers — use the package, pin count and the manufacturer family together to narrow it down, then confirm against the datasheet.

21 candidates 14 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BAT754S	NXP	SOT-23	Public marking directory
BC817-25	NXP	SOT-23 16ta - 3f Kec	Public marking directory
DDZ30D	DIODES	SOD-123	Public marking directory
DDZ30DS	DIODES	SOD-323	Public marking directory
DDZ30DS	DIODES	—	Public marking directory
DDZ33	DIODES	—	Public marking directory
DDZX30D	DIODES	SOT-23	Public marking directory
DDZX30DS	DIODES ^*	SOT-363	Public marking directory
DDZX30DTS	DIODES	SOT-23	Public marking directory
DDZX30DW	DIODES ^*	SOT-323	Public marking directory
MMBT404A	MOT	SOT-23	Public marking directory
R3111N521C	RICOH ^*	SOT-23-5	Public marking directory
RQ5RW22CA	RICOH ^*	SOT-143R	Public marking directory
UMZ16K	ROHM ^*	SOT-343	Public marking directory
BC817A-25	—	SOT-23 16ta - 3f Kec	Public marking directory
KIA7239F	—	SOT-89	Public marking directory
MM3Z24V	—	SOD-323	Public marking directory
R3131N26DC3	—	SOT-23	Public marking directory
R3133Q32EA	—	SOT-143	Public marking directory
XC6127N35CNR	—	SSOT-24	Public marking directory
XC6221C28BNR	—	SSOT-24	Public marking directory

How we narrow this down

Package first — SOT-23 vs SOD-123 vs SC-59 eliminates most candidates immediately.
Pin count and body size — a 3-pin SOT-23 LDO cannot be a 6-pin dual transistor.
Marking style — laser-marked parts are usually newer production; ink marking often indicates older or second-source vendors.
Circuits around it — a part sitting on a rail with an inductor is a regulator, not a diode.
Datasheet check — every credible candidate lists its marking scheme in the “marking information” section.

FAQ

Same code, several parts — which one do I actually have? Compare package + pin count + surrounding circuit; if it still fits two parts, request a sample verification before production.
Can I substitute between the candidates? No — the same marking may sit on electrically different parts. Always match the electrical spec sheet, not just the marking.
Where do these mappings come from? Public SMD marking directories and historical stock tables; each row keeps its source so you can trace it.

Other codes starting with “2”

20 22 24 25 27 2B 2C 2D 2F 2M

Still not sure what the part is?

Send the code, package and a photo through the BOM hub — our engineers cross-check it against datasheets and sourcing records.

How these mappings are compiled: public SMD marking directories plus our own stock records. Each row keeps its original reference internally, so any mapping can be traced on request. ^* Manufacturer derived from the part-number family (some directory entries carry no manufacturer) — treat it as a lead, not a datasheet fact. Markings are indicative only — confirm with the physical batch marking and the original datasheet before ordering.