PNDS / Marking codes / J5

Identify an unknown SMD part: marking code “J5”

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 17 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
CMOZ24V	CSC CENTRAL SEMIC.CORP. ^*	SOD-523	Public marking directory
MAX809RTR	ON	SOT-23	Public marking directory
MMBZ5250B	FSC	SOT-23	Public marking directory
MMBZ5250BW	DIODES	SOT-323	Public marking directory
MMSZ5250B	MCC	SOD-123	Public marking directory
MMSZ5250BS	DIODES	SOD-323	Public marking directory
MMSZ5250BS	DIODES	—	Public marking directory
MMSZ5251B	FSC	SOD-123	Public marking directory
MMSZ5251B	DIODES	—	Public marking directory
MMXZ5251B	MCC	SOD-323	Public marking directory
R3111N152C	RICOH ^*	SOT-23	Public marking directory
R3114Q421C	RICOH ^*	SC-82AB	Public marking directory
RN1966FS	TOS	—	Public marking directory
RN5RG25AA	RICOH ^*	SOT-23-5	Public marking directory
TC7SZ04F	TOS	SOT-353	Public marking directory
TC7SZ04FU	TOS	SOT-353	Public marking directory
ZC834	FERRANTI	SOT-23	Public marking directory
2SK67-5	—	SOT-23 16fh - 3a Nec	Public marking directory
AH175W	—	SOT-23	Public marking directory
CHT807PT-R	—	SOT-23 16ta - 3a Chm	Public marking directory
ELM7635HAB	—	SOT-23 16vdc VD7 3d Elm	Public marking directory
FRS3J	—	DO-214AB	Public marking directory
MMSZ5250	—	SOD-123	Public marking directory
R3130N45EA	—	SOT-23	Public marking directory
RP103Q191D	—	SC-82AB	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 “J”

J1 J2 J3 JS JC JJ J4 JE J6 J8

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.