PNDS / Marking codes / MCR

Identify an unknown SMD part: marking code “MCR”

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 14 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
A51	PHI	SOT-23-5	Public marking directory
L625	ST ^*	SOT-23-5	Public marking directory
LA30	ROHM ^*	SOT-143	Public marking directory
LA40	ROHM ^*	SOT-143	Public marking directory
LA50	ROHM ^*	SOT-143	Public marking directory
LD29	ST ^*	SOT-23-5	Public marking directory
LE30	ST ^*	SOT-23-5	Public marking directory
LE33	ST ^*	SOT-23-5	Public marking directory
LE50	ST ^*	SOT-23-5	Public marking directory
LS33	TI	SOT-23-5	Public marking directory
LT30	LT ^*	SOT-23-5	Public marking directory
LT31	LT ^*	SOT-23-5	Public marking directory
N825	INTEL ^*	SOT-23-5	Public marking directory
TB07	DIODES ^*	SOT-23-6	Public marking directory
62J	—	—	Public marking directory
6A050	—	USP-6C	Public marking directory
84H	—	—	Public marking directory
8A016	—	USP-6C	Public marking directory
A11	—	SOT-23-5	Public marking directory
A13	—	SOT-23-5	Public marking directory
A14	—	SOT-23-5	Public marking directory
A15	—	SOT-23-5	Public marking directory
A16	—	SOT-23-5	Public marking directory
A17	—	SOT-23-5	Public marking directory
A24	—	SOT-23-5	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.