PNDS / Marking codes / K

Identify an unknown SMD part: marking code “K”

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 10 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BAT68-03W	INFINEON	SOD323	Public marking directory
BBY52-02W	INFINEON	—	Public marking directory
DA204K	ROHM	SOT-346	Public marking directory
DA221	ROHM ^*	SOT-416	Public marking directory
DA221M	ROHM ^*	VMD3 16dl - 3j Rhm	Public marking directory
HMPS-2822	AGILENT	—	Public marking directory
MAZS039	PANASONIC ^*	SC-79	Public marking directory
MAZS0390L	PANASONIC ^*	SC-79	Public marking directory
MC78L05F	MCC	SOT-89	Public marking directory
MRF917	MOT	SOT323	Public marking directory
2SB1208	—	SOT-89	Public marking directory
BB142	—	SOD-523	Public marking directory
CDZ10B	—	—	Public marking directory
DA204U	—	SOT-323	Public marking directory
HVU315	—	SOD-123	Public marking directory
SB007W03C	—	CP 16dg - 3a San	Public marking directory
SB007W03Q	—	MCP 16dg - 3a San	Public marking directory
dc1	—	—	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.