PNDS / Marking codes / K9

Identify an unknown SMD part: marking code “K9”

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.

18 candidates 12 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
1SS348	TOS	SC-59	Public marking directory
BCV72R	PHI	SOT-23R	Public marking directory
BZX384-B5V1	NXP	SOD-323	Public marking directory
BZX84C20	FSC	SOT-23 16dc - 3a Lge	Public marking directory
MMSZ5249B	FSC	SOD-123	Public marking directory
R3111N292C	RICOH ^*	SOT-23	Public marking directory
R3111Q091A	RICOH ^*	SC-82AB	Public marking directory
R5426D108CA	RICOH ^*	—	Public marking directory
R5426N108CA	RICOH ^*	SOT-23-6	Public marking directory
RN2970FS	TOS	—	Public marking directory
RN5RG39AA	RICOH ^*	SOT-23-5	Public marking directory
RN5RY291A	RICOH ^*	SOT-23-5	Public marking directory
ELM7649HAB	—	SOT-23 16vdc VD7 3d Elm	Public marking directory
R1111N191B	—	SOT-23-5	Public marking directory
RP103Q291D5	—	SC-82AB	Public marking directory
RT9167A-24CBR	—	SOT-23-5	Public marking directory
XC6223E191NR-G	—	SSOT-24	Public marking directory
XC6GN0902HR	—	USP-3	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.