PNDS / Marking codes / YU

Identify an unknown SMD part: marking code “YU”

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.

21 candidates 17 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BU4227F	ROHM ^*	SOP-4	Public marking directory
BU4227FWE	ROHM ^*	VSOF-5	Public marking directory
BU4227G	ROHM ^*	SSOP-5	Public marking directory
BZX284-C4V3	PHI	SOD-110	Public marking directory
BZX284-C4V3	PHI	SOD110	Public marking directory
DDZ11C	DIODES	SOD-123	Public marking directory
DDZ11CS	DIODES	SOD-323	Public marking directory
DDZ11CS	DIODES	—	Public marking directory
DDZ12C	DIODES	—	Public marking directory
DDZX11C	DIODES	SOT-23	Public marking directory
DDZX11CTS	DIODES	SOT-363	Public marking directory
DDZX11CW	DIODES ^*	SOT-23	Public marking directory
R5325N028A	RICOH ^*	SOT-23-6	Public marking directory
RN2117	TOS	SOT-416	Public marking directory
RN2117FV	TOS	SOT-723	Public marking directory
RN2317	TOS	SOT-346	Public marking directory
RN2417	TOS	SOT-346	Public marking directory
P4SMAJ190C	—	DO-214AB	Public marking directory
R1210N382D	—	SOT-23-5	Public marking directory
TV04A450KB	—	DO-214AC	Public marking directory
XC6223H35BNR-G	—	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 “Y”

Y1 Y3 YA YB YC YE YELLOW YF YK YP

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.