PNDS / Marking codes / M5

Identify an unknown SMD part: marking code “M5”

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 22 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
2SA1622-5	TOS ^*	SOT-323 16ta - 3a San	Public marking directory
2SA812-M5	MCC	SOT-23	Public marking directory
2SA812-M6	MCC	SOT-23	Public marking directory
2SC5086-O	TOS	SC-70	Public marking directory
2SC5086FT-O	TOS ^*	—	Public marking directory
BSR57	PHI	—	Public marking directory
BZX384-B20	NXP	SOD-323	Public marking directory
CMOZ3L6	CSC CENTRAL SEMIC.CORP.	SOD-523	Public marking directory
ILC5061IC25X	FSC ^*	SC-70	Public marking directory
ILC5061M25X	FSC ^*	SOT-23	Public marking directory
KST812-M5	FSC ^*	SOT-23	Public marking directory
MMBA812M5	MOT	SOT-23	Public marking directory
MMBD352W	MOT	SOT-323	Public marking directory
MMSZ5254B	FSC	SOD-123	Public marking directory
R1121N351A	RICOH ^*	SOT-23-5	Public marking directory
R3111N452C	RICOH ^*	SOT-23	Public marking directory
R3111Q251A	RICOH ^*	SC-82AB	Public marking directory
R3116Q221A	RICOH ^*	SC-82AB	Public marking directory
RN5RG55AA	RICOH ^*	SOT-23-5	Public marking directory
RN5RY451A	RICOH ^*	SOT-23-5	Public marking directory
TC54VN2502ECB	MIC ^*	SOT-23	Public marking directory
TC54VN2502MB	MIC ^*	SOT-89	Public marking directory
2SA1179-5	—	CPA 16ta - 3a San	Public marking directory
2SA1179-M5	—	—	Public marking directory
2SA1611-5	—	SOT-323	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 M6 M7 M8 M9

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.