Identify an unknown SMD part: marking code “GD”

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.

18 candidates 7 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BAW78D	INFINEON	SOT-89	Public marking directory
BD4943FVE	ROHM *	VSOF-5	Public marking directory
BD4943G	ROHM *	SSOP-5	Public marking directory
GF1D	FSC	DO-214	Public marking directory
LM4878IBP	NSC	BGA-9	Public marking directory
LM4878IBPX	NSC	BGA-9	Public marking directory
MAX6315US44D1-T	MAX	SOT-143	Public marking directory
3T072A	—	DO-214AA	Public marking directory
ELM7633LDB	—	SOT-23 16vdc VD7 3d Elm	Public marking directory
FP6801-22NC8P	—	SC-82	Public marking directory
KDZ36B	—	—	Public marking directory
KRA154F	—	TFSM 19ta - 3k Kec	Public marking directory
P4SMAJ220	—	DO-214AC	Public marking directory
R1141Q331D	—	SOT-143R	Public marking directory
RP130Q241B	—	SC-82AB	Public marking directory
RT9161A-28CX	—	SOT-89	Public marking directory
SiP810CLEUDT	—	SOT-23	Public marking directory
Z2SMB-7V5	—	DO-214AA	Public marking directory

How we narrow this down

1. Package first — SOT-23 vs SOD-123 vs SC-59 eliminates most candidates immediately.
2. Pin count and body size — a 3-pin SOT-23 LDO cannot be a 6-pin dual transistor.
3. Marking style — laser-marked parts are usually newer production; ink marking often indicates older or second-source vendors.
4. Circuits around it — a part sitting on a rail with an inductor is a regulator, not a diode.
5. 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”

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.