PNDS / Marking codes / DQ

Identify an unknown SMD part: marking code “DQ”

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.

24 candidates 12 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
2P710AQ	PHI	SOT346	Public marking directory
2PB1219AQ	PHI	SOT-323 16ta - 3a PhH	Public marking directory
2PB710AQ	PHI	SC-59	Public marking directory
2PB710AQ	PHI	SC-59/SOT346	Public marking directory
2SB1219A-Q	PANASONIC ^*	SC-70	Public marking directory
2SD2176	PANASONIC ^*	PCP	Public marking directory
BD4834FVE	ROHM ^*	VSOF-5	Public marking directory
BD4834G	ROHM ^*	SSOP-5	Public marking directory
MAX6314US26D2-T	MAX	SOT-143	Public marking directory
MAX809BLUR	MAX ^*	SOT-23	Public marking directory
P6SMBJ75C	LITTLE ^*	DO-214AA	Public marking directory
R3112Q341C	RICOH ^*	SC-82AB	Public marking directory
2SB710A-Q	—	SC-59	Public marking directory
2SB789-Q	—	SOT-89	Public marking directory
AAT3527ICX-2.93-200	—	SOT-143	Public marking directory
AP131-31TW	—	—	Public marking directory
AP131-31W	—	SOT-23-5L	Public marking directory
AP131-31Y	—	SOT-89-5L	Public marking directory
HQ1A3M	—	SOT-89	Public marking directory
P4SMA170A	—	DO-214AC	Public marking directory
R5220D241B	—	—	Public marking directory
RT9809-39CV	—	SOT-23 16vdc VD7 3a Rct	Public marking directory
TV06B750KB	—	DO-214AA	Public marking directory
V6310QSP5B	—	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.