PNDS / Marking codes / 8K

Identify an unknown SMD part: marking code “8K”

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 14 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
DTC143ZE	ROHM	SC-75	Public marking directory
MMBZ5235B	FSC	SOT-23	Public marking directory
MUN2233	MOT	SC-59	Public marking directory
MUN5233	MOT	SOT-323	Public marking directory
NJM78L12A	NJR NEW-JAPAN-RADIO	SOT89	Public marking directory
NJM78L12UA	NJR	SOT-89	Public marking directory
R3111N281C	RICOH ^*	SOT-23-5	Public marking directory
RH5RE38AA	RICOH ^*	SOT-89	Public marking directory
RQ5RW39BA	RICOH ^*	SOT-143R	Public marking directory
TMPZ5235	TOS ^*	SOT-23	Public marking directory
TMPZ5235R	TOS ^*	SOT-23R	Public marking directory
UNR2219	PANASONIC ^*	SC-59	Public marking directory
UNR5219	PANASONIC ^*	SOT-523	Public marking directory
UNR9219J	PANASONIC ^*	SC-89	Public marking directory
CMBZ5235B	—	SOT-23	Public marking directory
CMBZ5236B	—	SOT-23	Public marking directory
HMBZ5235B	—	SOT-23	Public marking directory
KIA78L20F	—	SOT-89	Public marking directory
R1161D181D	—	—	Public marking directory
R3132Q49EC	—	SOT-143	Public marking directory
SMBZ5235B	—	SOT-23 16dc - 3a Sur	Public marking directory
UN2219	—	SC-59	Public marking directory
UN5219	—	SOT-523	Public marking directory
UN9219J	—	SC-89	Public marking directory
XC6127C29DNR	—	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 “8”

8A 8B 8C 8D 8E 8F 8H 8L 8N 8P

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.