PNDS / Marking codes / B5

Identify an unknown SMD part: marking code “B5”

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 11 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BZX399-C2V7	PHI	SOD-323	Public marking directory
BZX399-C2V7	PHI	SC-76/SOD323	Public marking directory
BZX399C2V7	PHI	SOD323	Public marking directory
FSS26	SANYO ^*	DO-214AA	Public marking directory
HSMS-2815	AGILENT	SOT-143	Public marking directory
MMSZ5242B	FSC	SOD-123	Public marking directory
R3111N152A	RICOH ^*	SOT-23	Public marking directory
R3113D251A	RICOH ^*	—	Public marking directory
R3114Q221A	RICOH ^*	SC-82AB	Public marking directory
R5421N114C	RICOH ^*	SOT-23-6	Public marking directory
TC1015-3.3VRX	MIC ^*	SOT-23-5	Public marking directory
2SC4987-5	—	SMCP	Public marking directory
AP432R	—	SOT-23-3L	Public marking directory
BZT52H-C3V0	—	SOD123F	Public marking directory
BZX884-C3V6	—	SOD-882	Public marking directory
ELM9715NAB	—	SOT-89	Public marking directory
ELM9835AB	—	SOT-89	Public marking directory
HVC372B	—	UFP	Public marking directory
R1111N351A	—	SOT-23-5	Public marking directory
R1140Q251B	—	SOT-143R	Public marking directory
R1160D151A	—	—	Public marking directory
R1180Q251B	—	SC-82AB	Public marking directory
R3130N25EC	—	SOT-23	Public marking directory
RN5VD15AA	—	SOT-23-5	Public marking directory
RT9169-16CV	—	SOT-23	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 B6 B7 B8 B9 BA BB

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.