PNDS / Marking codes / C4

Identify an unknown SMD part: marking code “C4”

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 15 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BCW29R	FERRANTI	SOT-23	Public marking directory
BZX884-B22	NXP	SOD-882	Public marking directory
HSMS-2824	AGILENT	SOT-23	Public marking directory
HSMS-282F	AGILENT	SOT-323	Public marking directory
ILC5062IC24X	FSC ^*	SC-70	Public marking directory
ILC5062M24X	FSC ^*	SOT-23	Public marking directory
MMSZ5225B	DIODES	SOD-123	Public marking directory
R3111N242A	RICOH ^*	SOT-23	Public marking directory
R3113D341A	RICOH ^*	—	Public marking directory
R3114Q311A	RICOH ^*	SC-82AB	Public marking directory
RN1905AFS	TOS ^*	—	Public marking directory
TC1054-3.3VCT713	MIC ^*	SOT-23-5	Public marking directory
TC4S71F	TOS	SC-59	Public marking directory
TC54VC2402ECB	MIC ^*	SOT-23	Public marking directory
TC54VC2402MB	MIC ^*	SOT-89	Public marking directory
AP130-45TW	—	—	Public marking directory
AP130-45W	—	SOT-23	Public marking directory
AP130-45Y	—	SOT-89	Public marking directory
BZT52H-C62	—	SOD123F	Public marking directory
BZX585-B3V3	—	SOD-523	Public marking directory
ELM9724NAB	—	SOT-89	Public marking directory
ELM9844AB	—	SOT-89	Public marking directory
FSS35	—	DO-214AB	Public marking directory
KA4L4M	—	SC-75	Public marking directory
MC804	—	SOT-23	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 C5 C6 C7 C8 C9 CA

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.