PNDS / Marking codes / 9B

Identify an unknown SMD part: marking code “9B”

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 10 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BZB784-C6V2	PHI	SOT-323	Public marking directory
BZT52C6V2S	DIODES	—	Public marking directory
HA179L05U	HIT ^*	SOT-89	Public marking directory
NJM79L03UA	NJR	SOT-89	Public marking directory
PLVA653A	NXP	SOT23	Public marking directory
R3111N191A	RICOH ^*	SOT-23-5	Public marking directory
RH5RL29AA	RICOH ^*	SOT-89	Public marking directory
RN5RL29AA	RICOH ^*	SOT-23-5	Public marking directory
RQ5RW41BA	RICOH ^*	SOT-143R	Public marking directory
UNR2222	PANASONIC ^*	SC-59	Public marking directory
2SC5938A-B	—	SC-59	Public marking directory
2SC5996A-B	—	SC-70	Public marking directory
BZT52-C6V2LP	—	DFN1006-2	Public marking directory
KIA79L06F	—	SOT-89	Public marking directory
MM1Z2V2B	—	SOD-123	Public marking directory
R1161D191A	—	—	Public marking directory
R3131N29EC	—	SOT-23	Public marking directory
RN5VD19CA	—	SOT-23-5	Public marking directory
UN2222	—	SC-59	Public marking directory
VR1	—	—	Public marking directory
VR10	—	—	Public marking directory
VR4	—	—	Public marking directory
VR4a	—	—	Public marking directory
XC6127C17ENR	—	SSOT-24	Public marking directory
XC6127N17KNR	—	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 “9”

9A 9C 9D 9E 9F 94 9K 9L 91 95

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.