PNDS / Marking codes / CY

Identify an unknown SMD part: marking code “CY”

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
2SC2881-Y	MCC	SOT-89	Public marking directory
2SC4209-Y	TOS	SC-59 16ta - 3a Tos	Public marking directory
2SC4397	TOS ^*	SOT-323	Public marking directory
2SC5087-Y	TOS	SMQ	Public marking directory
2SC5343E-Y	TOS ^*	SOT-523 16ta - 3a Auk	Public marking directory
2SC5343EF-Y	TOS ^*	SOT-523F	Public marking directory
BFS18R	PHI	SOT-23	Public marking directory
BH30NB1WHFV	ROHM ^*	—	Public marking directory
MAX6314US40D2-T	MAX ^*	SOT-143	Public marking directory
MAZ6004UR	MAX	SOT-23	Public marking directory
MMBZ4693	VISHAY ^*	SOT-23	Public marking directory
P6SMBJ51C	LITTLE ^*	DO-214AA	Public marking directory
TC1054-1.8VCT713	MIC ^*	SOT-23-5	Public marking directory
XC61119C28ANR-G	TOREX ^*	SSOT-24 26gh VD3 5c Tor	Public marking directory
XC6119C28ANR	TOREX ^*	SSOT-24	Public marking directory
2SA1980U-Y	—	SOT-323 16ta - 3a Auk	Public marking directory
2SA1980UF-Y	—	SOT-323F 18ta - 3a Auk	Public marking directory
2SC3396	—	CP 16ta - 3a San	Public marking directory
2SJ186	—	SOT-89	Public marking directory
AP130-39TW	—	—	Public marking directory
AP130-39W	—	SOT-23	Public marking directory
AP130-39Y	—	SOT-89	Public marking directory
KTC4373-Y	—	SOT-89	Public marking directory
MMSZ4693	—	SOD-123	Public marking directory
MMSZ4706	—	SOD-123	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.