PNDS / Marking codes / M9

Identify an unknown SMD part: marking code “M9”

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
2SC5096-R	TOS	SC-70	Public marking directory
2SC5096F-R	TOS ^*	TESM 18ta - 3a Tos	Public marking directory
BSS67R	FERRANTI	SOT-23	Public marking directory
BZX384-B30	PHI	SOD-323	Public marking directory
BZX84C22	FSC	SOT-23 16dc - 3a Lge	Public marking directory
CMOZ5L1	CSC CENTRAL SEMIC.CORP.	SOD-523	Public marking directory
ILC5061IC29X	FSC ^*	SC-70	Public marking directory
ILC5061M29X	FSC	SOT-23	Public marking directory
MMSZ5253B	FSC	SOD-123	Public marking directory
R1121N391A	RICOH ^*	SOT-23-5	Public marking directory
R3111N492C	RICOH ^*	SOT-23	Public marking directory
R3111Q291A	RICOH ^*	SC-82AB	Public marking directory
R3116Q261A	RICOH ^*	SC-82AB	Public marking directory
RN5RG59AA	RICOH ^*	SOT-23-5	Public marking directory
RN5RY491A	RICOH ^*	SOT-23-5	Public marking directory
TC54VN2902ECB	MIC ^*	SOT-23	Public marking directory
TC54VN2902MB	MIC ^*	SOT-89	Public marking directory
ELM7639LAB	—	SOT-23 16vdc VD7 3d Elm	Public marking directory
R1100D191C	—	—	Public marking directory
R1131D191B	—	—	Public marking directory
R1151N010C	—	SOT-23-6	Public marking directory
RP104Q231B	—	SC-82AB	Public marking directory
RT9168A-24CBR	—	SOT-23-5	Public marking directory
XC61CN2902M	—	SOT-23	Public marking directory
XC61CN2902N	—	SOT-143R	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 “M”

MEV MK7 M1 M2 M3 M4 M5 M6 M7 M8

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.