PNDS / Marking codes / KU

Identify an unknown SMD part: marking code “KU”

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.

20 candidates 12 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
2SK3121	SANYO	SOT-89	Public marking directory
BU4935F	ROHM ^*	SOP-4	Public marking directory
BU4935FWE	ROHM ^*	VSOF-5	Public marking directory
BU4935G	ROHM ^*	SSOP-5	Public marking directory
DDZ11B	DIODES ^*	SOD-123	Public marking directory
P6SMBJ9.0	LITTLE ^*	DO-214AA	Public marking directory
R1112N181B	RICOH ^*	SOT-23-5	Public marking directory
R5426D102DA	RICOH ^*	—	Public marking directory
R5426N102DA	RICOH ^*	SOT-23-6	Public marking directory
SSM3K02F	TOS	SOT-23	Public marking directory
XC61119N15ANR-G	TOREX ^*	SSOT-24 26gh VD1 5c Tor	Public marking directory
XC6119N15ANR	TOREX ^*	SSOT-24	Public marking directory
FP6811-44CC4P	—	SC-70-4	Public marking directory
P6SMB13	—	DO-214AA	Public marking directory
PT7M6227CHC4	—	SC-70-4	Public marking directory
PT7M6227CHC4E	—	SC-70-4	Public marking directory
TV06B9V0K	—	DO-214AA	Public marking directory
XC6120C25N	—	SSOT-24	Public marking directory
XC6127C46CNR	—	SSOT-24	Public marking directory
XC6127N46HNR	—	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 “K”

K1 K2 K4 K5 KB KC KD KE KEC KM

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.