PNDS / Marking codes / G4

Identify an unknown SMD part: marking code “G4”

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 13 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
2SA1257-4	TOS ^*	SOT-23	Public marking directory
BAR63	INFINEON	SOT-23	Public marking directory
BAR63-04	INFINEON	SOT23	Public marking directory
BFS20R	PHI	SOT-23	Public marking directory
HSMP-3894	AGILENT	SOT23	Public marking directory
HSMP-389F	AGILENT	SOT-323	Public marking directory
MMSZ5229B	FSC	SOD-123	Public marking directory
MMSZ5230B	DIODES	—	Public marking directory
R3113D341C	RICOH ^*	—	Public marking directory
R3114Q211C	RICOH ^*	SC-82AB	Public marking directory
RT9166-18CVL	RICHTEK TECHNOLOGY, CORP.	SOT-23	Public marking directory
TC7SET32F	TOS	SC-59	Public marking directory
TC7SET32FU	TOS	SOT-353	Public marking directory
2SC2107-4	—	SOT-23 16ta - 3a Nec	Public marking directory
3T110AA	—	DO-214AA	Public marking directory
ELM7634HBB	—	SOT-23 16vdc VD7 3d Elm	Public marking directory
FP6801-27CC8P	—	SC-82	Public marking directory
FRS2G	—	DO-214AA	Public marking directory
KA4A3Q	—	SC-75	Public marking directory
MBT35200M	—	TSOP-6	Public marking directory
MMSZ5229BS	—	SOD-323	Public marking directory
R1111N341B	—	SOT-23-5	Public marking directory
R1131D141A	—	—	Public marking directory
R1140Q341D	—	SOT-143R	Public marking directory
R1160D241B	—	—	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 “G”

GL GU GFK7 G1 G3 G5 G2 GG GD GY

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.