PNDS / Marking codes / BN

Identify an unknown SMD part: marking code “BN”

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 12 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BD4732G	ROHM ^*	—	Public marking directory
BZX399-C15	PHI	SOD-323	Public marking directory
BZX399-C15	PHI	SC-76/SOD323	Public marking directory
BZX399C15	NXP	SOD323	Public marking directory
MMBZ5251B	NSC	SOT-23 16dc - 3a Lge	Public marking directory
P6SMBJ16C	LITTLE ^*	DO-214AA	Public marking directory
R1112N321A	RICOH ^*	SOT-23-5	Public marking directory
R3112Q121C	RICOH ^*	SC-82AB	Public marking directory
R5421N174C	RICOH ^*	SOT-23-6	Public marking directory
UDZ16B	DIODES ^*	SOD-323	Public marking directory
XC61119C10ANR-G	TOREX ^*	SSOT-24 26gh VD3 5c Tor	Public marking directory
XC6119C10ANR	TOREX ^*	SSOT-24	Public marking directory
2SB1394	—	PCP	Public marking directory
2SD2324	—	SOT-23	Public marking directory
BZT52H-C15	—	SOD123F	Public marking directory
GS6332UR15D1	—	SOT-23	Public marking directory
MMSZ4686	—	SOD-123	Public marking directory
P4SMA27	—	DO-214AC	Public marking directory
RT9169-33CV	—	SOT-23	Public marking directory
RT9169-33CX	—	SOT-89	Public marking directory
SiP6332R15D1	—	SOT-23	Public marking directory
TV04A160K	—	DO-214AC	Public marking directory
TV06B160KB	—	DO-214AA	Public marking directory
V6300NSP5B	—	SOT-23-5	Public marking directory
XC6109C10AN	—	SSOT-24	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 “B”

B1 B2 B3 B4 B5 B6 B7 B8 B9 BA

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.