PNDS / Marking codes / CJ

Identify an unknown SMD part: marking code “CJ”

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.

23 candidates 10 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
2SC4390	TOS ^*	PCP	Public marking directory
BH33FB1WG	ROHM ^*	SSOP-5	Public marking directory
BH33FB1WHFV	ROHM ^*	—	Public marking directory
BH33MA3WHFV	ROHM ^*	—	Public marking directory
BH33RB1WGUT	ROHM ^*	BGA-4	Public marking directory
BSS80C	INFINEON	SOT-23	Public marking directory
MAX6314US29D1-T	MAX ^*	SOT-143	Public marking directory
MMBZ4683	VISHAY ^*	SOT-23	Public marking directory
R3112Q281A	RICOH ^*	SC-82AB	Public marking directory
RN5RT48AA	RICOH ^*	SOT-23-5	Public marking directory
2SB1002-J	—	SOT-89	Public marking directory
2SK2552B-J	—	SOT-23	Public marking directory
AP130-24TW	—	—	Public marking directory
AP130-24W	—	SOT-23	Public marking directory
AP130-24Y	—	SOT-89	Public marking directory
CPH3209	—	—	Public marking directory
ELM99481B	—	SOT-89	Public marking directory
MMSZ4683	—	SOD-123	Public marking directory
MMSZ4699	—	SOD-123	Public marking directory
R1141Q381B	—	SOT-143R	Public marking directory
R5220D181A	—	—	Public marking directory
RP130Q381A	—	SC-82AB	Public marking directory
V6301JSP5B	—	SOT-23-5	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 “C”

C0 C1 C2 C3 C4 C5 C6 C7 C8 C9

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.