PNDS / Marking codes / 12A

Identify an unknown SMD part: marking code “12A”

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.

19 candidates 13 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
1.5SMC12A	ON	DO-214AB	Public marking directory
12C	MCC	SMAJP4KE13A	Public marking directory
MAZ3120WA	PANASONIC ^*	SC-59 16df - 3a Pan	Public marking directory
MMBD1502A	NSC	SOT23	Public marking directory
MMQA12V	ON ^*	SC-74	Public marking directory
P6SMBJ12A	LITTLE	DO-214AA	Public marking directory
PZM12NB2A	PHI	SOT-346 16df - 3a Phi	Public marking directory
PZM12NB2A	PHI	SC-59/SOT346	Public marking directory
STD123ASF	ST ^*	SOT-23F	Public marking directory
TLZ12A	VISHAY ^*	SOD-80	Public marking directory
XC6372A211P	TOREX ^*	SOT-89	Public marking directory
XC6503P22AJR-G	TOREX ^*	TO-252	Public marking directory
XC6503P22APR-G	TOREX ^*	SOT-89	Public marking directory
APR3012-15A	—	SOT-23 16vdc VD7 3b Anp	Public marking directory
APR3012-15B	—	SOT-23-5	Public marking directory
APR3012-15D	—	SOT-89	Public marking directory
GLZ12A	—	SOD-80	Public marking directory
P4SMA12A	—	DO-214AC	Public marking directory
XC6102A341MR	—	SOT-23-5	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 “1”

10 11 12 13 14 15 16 18 1A 1B

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.