PNDS / Marking codes / DB

Identify an unknown SMD part: marking code “DB”

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 9 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BCW67B	INFINEON	SOT-23	Public marking directory
BF623	INFINEON	SOT-89	Public marking directory
BF623	PHI	SC-62/SOT89	Public marking directory
BF723	PHI	SOT-223	Public marking directory
BZX884-C43	PHI	SOD-882	Public marking directory
MAX6314US37D2-T	MAX ^*	SOT-143	Public marking directory
R3112Q311A	RICOH ^*	SC-82AB	Public marking directory
RN5RT51AA	RICOH ^*	SOT-23-5	Public marking directory
ZMV830	ZETEX ^*	SOD-323	Public marking directory
2SA1669	—	SOT-23	Public marking directory
2SD1418-B	—	SOT-89	Public marking directory
2SD1418-DB	—	SOT-89	Public marking directory
3T350AB	—	DO-214AA	Public marking directory
AP131-16TW	—	—	Public marking directory
AP131-16W	—	SOT-23-5L	Public marking directory
AP131-16Y	—	SOT-89-5L	Public marking directory
Anode1	—	—	Public marking directory
BZX384-C12	—	SOD-323	Public marking directory
ELM99511B	—	SOT-89	Public marking directory
MMSZ4709	—	SOD-123	Public marking directory
R5220D111B	—	—	Public marking directory
RP130Q411A	—	SC-82AB	Public marking directory
RT9809-26CV	—	SOT-23 16vdc VD7 3a Rct	Public marking directory
TCUDZS10VB	—	SOD-323F	Public marking directory
V6310BSP5B	—	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 “D”

D0 D1 D2 D3 D4 D5 D6 D7 D8 D9

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.