PNDS / Marking codes / BP

Identify an unknown SMD part: marking code “BP”

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 15 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BCW61BR	PHI	SOT23	Public marking directory
BD4734G	ROHM ^*	—	Public marking directory
BZT52H-C16	NXP	SOD123F	Public marking directory
BZX399-C16	PHI	SOD-323	Public marking directory
BZX399-C16	PHI	SC-76/SOD323	Public marking directory
BZX399C16	PHI	SOD323	Public marking directory
CMDZ2L5	CSC CENTRAL SEMIC.CORP.	SOD-323	Public marking directory
MMBZ5252B	FS	SOT-23 16dc - 3a Lge	Public marking directory
P6SMBJ16AC	LITTLE ^*	DO-214AA	Public marking directory
R1112N331A	RICOH ^*	SOT-23-5	Public marking directory
R3112Q131C	RICOH ^*	SC-82AB	Public marking directory
R5421N175C	RICOH ^*	SOT-23-6	Public marking directory
SMF16A	ON	DO-219AB	Public marking directory
XC61119C11ANR-G	TOREX ^*	SSOT-24 26gh VD3 5c Tor	Public marking directory
XC6119C11ANR	TOREX ^*	SSOT-24	Public marking directory
2SB1397	—	PCP	Public marking directory
2SJ574	—	SOT-23	Public marking directory
CD214B-T16CA	—	DO-214AA	Public marking directory
GS6332UR15D3	—	SOT-23	Public marking directory
MMSZ4687	—	SOD-123	Public marking directory
P4SMA27A	—	DO-214AC	Public marking directory
P4SMAJ16A	—	DO-214AC	Public marking directory
RT9169-18CVL	—	SOT-23	Public marking directory
RT9169-34CX	—	SOT-89	Public marking directory
SiP6332R15D3	—	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 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.