PNDS / Marking codes / YZ

Identify an unknown SMD part: marking code “YZ”

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.

17 candidates 12 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BU4232F	ROHM ^*	SOP-4	Public marking directory
BU4232FWE	ROHM ^*	VSOF-5	Public marking directory
BU4232G	ROHM ^*	SSOP-5	Public marking directory
BZX284-C6V8	PHI	SOD-110	Public marking directory
BZX284-C6V8	PHI	SOD110	Public marking directory
DDZ18C	DIODES	SOD-123	Public marking directory
DDZ18CS	DIODES	SOD-323	Public marking directory
DDZ18CS	DIODES	—	Public marking directory
DDZ20C	DIODES	—	Public marking directory
DDZX18C	DIODES	SOT-23	Public marking directory
DDZX18CTS	DIODES	SOT-363	Public marking directory
DDZX18CW	DIODES ^*	SOT-323	Public marking directory
P4SMAJ210AC	—	DO-214AC	Public marking directory
P4SMAJ51CA	—	DO-214AC	Public marking directory
TCMM3Z47VB	—	SOD-323F	Public marking directory
TV04A510JB	—	DO-214AC	Public marking directory
XC6223H39BNR-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.