PNDS / Marking codes / K2

Identify an unknown SMD part: marking code “K2”

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.

25 candidates 20 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
2SK2742	TOS	SOT-89	Public marking directory
AH182W	DIODES ^*	SOT-23	Public marking directory
BCW72	PHI	SOT23	Public marking directory
HN1L02FU	TOS	SOT-363	Public marking directory
HSMP-3832	AGILENT	SOT-23	Public marking directory
MAX810MTR	ON	SOT-23	Public marking directory
MMBZ5252B	FS	SOT-23	Public marking directory
MMBZ5252BW	DIODES	SOT-323	Public marking directory
MMSZ5252B	MCC	SOD-123	Public marking directory
MMSZ5252BS	DIODES	SOD-323	Public marking directory
MMSZ5252BS	DIODES	—	Public marking directory
MMSZ5254B	DIODES	—	Public marking directory
MMXZ5254B	MCC	SOD-323	Public marking directory
R3111N222C	RICOH ^*	SOT-23	Public marking directory
R3114Q491C	RICOH ^*	SC-82AB	Public marking directory
R5426D103BB	RICOH ^*	—	Public marking directory
R5426N103BB	RICOH ^*	SOT-23-6	Public marking directory
RN2963FS	TOS	—	Public marking directory
RN5RG32AA	RICOH ^*	SOT-23-5	Public marking directory
RN5RY221A	RICOH ^*	SOT-23-5	Public marking directory
2SK57-2	—	SOT-23 16fa - 3a Nec	Public marking directory
A1/2	—	—	Public marking directory
A3/A4	—	—	Public marking directory
Anode2	—	—	Public marking directory
BZX384-B2V7	—	SOD-323	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 “K”

K1 K4 K5 KB KC KD KE KEC KM KN

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.