PNDS / Marking codes / C2

Identify an unknown SMD part: marking code “C2”

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 22 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BCW30	PHI	SOT-23	Public marking directory
BFQ32C	PHI	SOT173	Public marking directory
BFS38	FERRANTI	SOT-323	Public marking directory
HSMS-2822	AVG	SOT-23	Public marking directory
HSMS-282C	AGILENT	SOT-323	Public marking directory
KV1720R	TOKO	SOT-23C-3	Public marking directory
KV1720S	TOKO	SOT-23	Public marking directory
MMBZ5222B	DIODES	SOT-23	Public marking directory
MMBZ5222BW	MCC	SOT-323	Public marking directory
MMSZ5222B	MCC	SOD-123	Public marking directory
MMSZ5223B	MCC	SOD-123	Public marking directory
MMXZ5222B	MCC	SOD-323	Public marking directory
R3111N222A	RICOH ^*	SOT-23	Public marking directory
R3113D321A	RICOH ^*	—	Public marking directory
R3114Q291A	RICOH ^*	SC-82AB	Public marking directory
RN1903AFS	TOS ^*	—	Public marking directory
SST112	SILICONIX-VISHAY	SOT-23	Public marking directory
TC1054-2.7VCT713	MIC ^*	SOT-23-5	Public marking directory
TC4S81F	TOS	SOT-23-5	Public marking directory
TC54VC2202ECB	MIC ^*	SOT-23	Public marking directory
TC54VC2202MB	MIC ^*	SOT-89	Public marking directory
UDZS5.6B	ROHM ^*	—	Public marking directory
AP130-43TW	—	—	Public marking directory
AP130-43W	—	SOT-23	Public marking directory
AP130-43Y	—	SOT-89	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 C3 C4 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.