PNDS / Marking codes / ZX

Identify an unknown SMD part: marking code “ZX”

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 19 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
10C	MCC	SOT-23	Public marking directory
10K	TDK	SC-59	Public marking directory
15C	MCC	SOT-89	Public marking directory
4Ep	PHI	SOT-23	Public marking directory
4V3	ST	SOT-346	Public marking directory
51V	PHI	SOT-346	Public marking directory
5Dt	PHI	SOT-23	Public marking directory
5V1	BJL	SOT-346	Public marking directory
62V	PHI	SC-59	Public marking directory
7V5	DX	SOT-346	Public marking directory
9V1	DX	SOT-346	Public marking directory
BU4314F	ROHM ^*	SOP-4	Public marking directory
BU4314FWE	ROHM ^*	VSOF-5	Public marking directory
BU4314G	ROHM ^*	SSOP-5	Public marking directory
BZX284-C68	PHI	SOD-110	Public marking directory
BZX284-C68	PHI	SOD110	Public marking directory
CD-0603-Z33	BOURNS ^*	0603	Public marking directory
CD-1005-Z33	CDE ^*	—	Public marking directory
CF02M	YAGEO ^*	DO-214AC	Public marking directory
04F	—	SOT-89	Public marking directory
05F	—	SOT-89	Public marking directory
10B	—	SOT-23	Public marking directory
10D	—	SOT-23	Public marking directory
10F	—	SOT-23	Public marking directory
10G	—	SOT-23	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 “Z”

Z1 Z2 Z3 Z4 Z6 Z8 ZC ZQ ZR ZS

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.