PNDS / Marking codes / 1G

Identify an unknown SMD part: marking code “1G”

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
BC847C	NXP	SOT-23	Public marking directory
BC847CT	DIODES	SOT-416	Public marking directory
BC847CT	PHI	SC-75/ SOT416	Public marking directory
BC847CT	DIODES	—	Public marking directory
BC847CW	MCC	SOT-323	Public marking directory
BC847PN	MCC	SOT-363	Public marking directory
BU4347F	ROHM ^*	SOP-4	Public marking directory
BU4347FWE	ROHM ^*	VSOF-5	Public marking directory
BU4347G	ROHM ^*	SSOP-5	Public marking directory
FMMT-A06	FERRANTI	SOT23	Public marking directory
KST06	FSC	SOT-23	Public marking directory
MM5Z75V	FSC	SOD-523	Public marking directory
MMBTA06	FSC	SOT-23	Public marking directory
SMBTA06	INFINEON	SOT-23 16ta - 3a Inf	Public marking directory
BC847CDW	—	SOT-363	Public marking directory
BC847CF	—	SOT-490	Public marking directory
CMBTA06	—	SOT-23	Public marking directory
CMBTA14	—	SOT-23	Public marking directory
FMMTA06	—	SOT-23	Public marking directory
MM3Z75V	—	SOD-323	Public marking directory
R1161D211B	—	—	Public marking directory
R3131N21EA	—	SOT-23	Public marking directory
R3132Q26EA	—	SOT-143	Public marking directory
R5326N007A	—	SOT-23-6	Public marking directory
TMPTA06	—	SOT-23	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 “1”

10 11 12 13 14 15 16 18 1A 1B

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.