PNDS / Marking codes / KB

Identify an unknown SMD part: marking code “KB”

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 12 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
2SC3936-B	PANASONIC ^*	SC-70	Public marking directory
2SC4539	TOS	SOT-89	Public marking directory
BSS192	PHI	SOT-89	Public marking directory
BU4918F	ROHM ^*	SOP-4	Public marking directory
BU4918FWE	ROHM ^*	VSOF-5	Public marking directory
BU4918G	ROHM ^*	SSOP-5	Public marking directory
DZ23C6V8	DIODES	SOD-23 16dg - 3a Lge	Public marking directory
MMBT8099L	MOT	SOT23	Public marking directory
R1114Q211A	RICOH ^*	SOT-143R	Public marking directory
R5426D110FA	RICOH ^*	—	Public marking directory
R5426N110FA	RICOH ^*	SOT-23-6	Public marking directory
RN1441B	TOS	SOT-346	Public marking directory
2SC2778-B	—	SOT-23	Public marking directory
2SC4655-B	—	SOT-416 16ta - 3a Pan	Public marking directory
2SK1311	—	SOT-89	Public marking directory
2SK323-B	—	SOT-23 16fa - 3a Ren	Public marking directory
2SK433-B	—	SC-59	Public marking directory
ELM7621HDB	—	SOT-23 16vdc VD7 3d Elm	Public marking directory
FP6811-26NC4P	—	SC-70-4	Public marking directory
KDZ4.7B	—	—	Public marking directory
PT7M6221CLC4	—	SC-70-4	Public marking directory
PT7M6221CLC4E	—	SC-70-4	Public marking directory
RT9167A-26CBR	—	SOT-23-5	Public marking directory
XC6120C11N	—	SSOT-24	Public marking directory
XC6127C18CNR	—	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 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.