PNDS / Marking codes / A2

Identify an unknown SMD part: marking code “A2”

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 25 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
1N4148W	VISHAY	SOD-123	Public marking directory
1N4148WS	FSC	SOD-323	Public marking directory
1SS309	TOS	SOT-23-5	Public marking directory
BA592	INFINEON	SOD-323	Public marking directory
BAS16T	NXP	SOT-416	Public marking directory
BAS16TW	DIODES	—	Public marking directory
BAS16TW	MCC	SOT-363	Public marking directory
BAS16W	NXP	SOT-323	Public marking directory
BAS16WX	MCC	SOD-323	Public marking directory
BAT18	PHI	SOT-23	Public marking directory
BZX884-B2V7	NXP	SOD-882	Public marking directory
CFY30	INFINEON	SOT-143	Public marking directory
FSS13	SANYO ^*	DO-214AC	Public marking directory
HSMS-2802	AGILENT	SOT-23	Public marking directory
HSMS-280C	HP	SOT-323	Public marking directory
KV1520	TOKO	SOT-23	Public marking directory
MBT3906DW	MOT	SOT-363	Public marking directory
MBT3906DW1	MOT	SOT363	Public marking directory
MC2833	MOT	SC-59	Public marking directory
MMBD2836	MOT	SOT23	Public marking directory
MMBD4148	FSC	SOT-23	Public marking directory
MMBD4148W	DIODES	SOT-323	Public marking directory
MMSZ11	ON ^*	SOD-123	Public marking directory
R3113D121A	RICOH ^*	—	Public marking directory
R3114Q091A	RICOH ^*	SC-82AB	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 “A”

AL AH-16 A1 A3 A4 A5 A6 A7 A8 A9

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.