PNDS / Marking codes / L3

Identify an unknown SMD part: marking code “L3”

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
BAT54CW	DIODES	—	Public marking directory
BAT54CWT	MCC	SOT-323	Public marking directory
BFS37	FERRANTI	SOT-323	Public marking directory
BSS70	FERRANTI	SOT-23	Public marking directory
HD74LV1G02ACME	HIT	—	Public marking directory
HSMP-3863	AGILENT	SOT-23	Public marking directory
HSMP-386E	AGILENT	SOT-323	Public marking directory
KST1623-L3	FSC ^*	SOT-23	Public marking directory
MMBC1623L3	MOT	SOT-23	Public marking directory
NL17SZ02DF	ON ^*	SOT-353	Public marking directory
R1121N231A	RICOH ^*	SOT-23-5	Public marking directory
R3111N332C	RICOH ^*	SOT-23	Public marking directory
R3111Q131A	RICOH ^*	SC-82AB	Public marking directory
R3116Q101A	RICOH ^*	SC-82AB	Public marking directory
RN1104FS	TOS	—	Public marking directory
RN5RG43AA	RICOH ^*	SOT-23-5	Public marking directory
RN5RY331A	RICOH ^*	SOT-23-5	Public marking directory
TC7SL02F	TOS	SOT-23-5	Public marking directory
TC7SL02FU	TOS ^*	SOT-353	Public marking directory
2SC1623-3	—	SOT-23	Public marking directory
BZX384-B6V8	—	SOD-323	Public marking directory
ELM7623LAB	—	SOT-23 16vdc VD7 3d Elm	Public marking directory
HD74LV1G02AVSE	—	VSON–5	Public marking directory
R1211D002D	—	—	Public marking directory
R1211N002D	—	SOT-23-6W 33sl	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 “L”

LT7 LTDPN L1 L2 L4 L5 L6 L7 L8 L9

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.