PNDS / Marking codes / 8M

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

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.

22 candidates 11 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
DTC123JE	ROHM	SC-75	Public marking directory
MMBZ5237B	FSC	SOT-23	Public marking directory
NJM78L18A	NJR NEW-JAPAN-RADIO	SOT89	Public marking directory
NJM78L18UA	NJR	SOT-89	Public marking directory
R3111N481C	RICOH ^*	SOT-23-5	Public marking directory
RH5RE58AA	RICOH ^*	SOT-89	Public marking directory
TMPZ5237	TOS ^*	SOT-23	Public marking directory
TMPZ5237R	TOS ^*	SOT-23R	Public marking directory
UNR221D	PANASONIC ^*	SC-59	Public marking directory
UNR521D	PANASONIC ^*	SOT-523	Public marking directory
UNR921DJ	PANASONIC ^*	SC-89	Public marking directory
CMBZ5237B	—	SOT-23	Public marking directory
HMBZ5237B	—	SOT-23	Public marking directory
R3133Q41EC	—	SOT-143	Public marking directory
SMBZ5237B	—	SOT-23 16dc - 3a Sur	Public marking directory
UN221D	—	SC-59	Public marking directory
UN521D	—	SOT-523	Public marking directory
UN921DJ	—	SC-89	Public marking directory
XC6127C33DNR	—	SSOT-24	Public marking directory
XC6127N33JNR	—	SSOT-24	Public marking directory
XC6223A29BNR-G	—	SSOT-24	Public marking directory
ZD5237BN3	—	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 “8”

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

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.