PNDS / Marking codes / EY

Identify an unknown SMD part: marking code “EY”

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 14 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
2SC2882-Y	TOS	SOT-89	Public marking directory
2SC3265-Y	TOS	SC-59 16ta - 3a Tos	Public marking directory
2SC4398	TOS ^*	SOT-323	Public marking directory
BCW65GR	INFINEON	SOT23R	Public marking directory
MAX6314US49D4-T	MAX ^*	SOT-143	Public marking directory
P6SMBJ210C	LITTLE ^*	DO-214AA	Public marking directory
RT9167-47CB	RICHTEK	SOT-23-5	Public marking directory
UNR211T	PANASONIC ^*	SC-59	Public marking directory
UNR311T	PANASONIC ^*	SSSMini3 18ta - 3a Pan	Public marking directory
UNR511T	PANASONIC ^*	SOT-523	Public marking directory
UNR911TJ	PANASONIC ^*	SC-89	Public marking directory
XC61119C48ANR-G	TOREX ^*	SSOT-24 26gh VD3 5c Tor	Public marking directory
XC6119C48ANR	TOREX ^*	SSOT-24	Public marking directory
Z1SMA-39	FAGOR	DO-214AC	Public marking directory
2SC3398	—	CP 16ta - 3a San	Public marking directory
2SD2402-Y	—	SOT-89	Public marking directory
2SK1697	—	SOT-89	Public marking directory
AP1603W	—	SOT-23-6	Public marking directory
KTC3265-Y	—	SOT-23	Public marking directory
KTC4374-Y	—	SOT-89	Public marking directory
SiP810CTEUADT	—	SOT-23	Public marking directory
UN211T	—	SC-59	Public marking directory
UN511T	—	SOT-523	Public marking directory
UN911TJ	—	SC-89	Public marking directory
XC6109C48AN	—	SSOT-24	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 “E”

EK EV E0 E1 E2 E3 E4 E5 E6 E8

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.