PNDS / Marking codes / A5

Identify an unknown SMD part: marking code “A5”

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 13 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
1SS384	TOS	SOT-323	Public marking directory
1SS391	TOS	SOT-143	Public marking directory
BAP51-03	NXP	SOD-323	Public marking directory
HSMS-2805	HP	SOT-143	Public marking directory
MC2834	MOT ^*	SC-59	Public marking directory
MMBD1010	MOT	SOT23	Public marking directory
MMBD2837	MOT	SOT-23	Public marking directory
MMSZ15	ON ^*	SOD-123	Public marking directory
MMSZ5241B	FSC	SOD-123	Public marking directory
R3113D151A	RICOH ^*	—	Public marking directory
R3114Q121A	RICOH ^*	SC-82AB	Public marking directory
TC1014-3.3VRX	MIC ^*	SOT-23-5	Public marking directory
UDZS27B	ROHM ^*	—	Public marking directory
1N4151W	—	SOD-323	Public marking directory
1S2837	—	SOT-23	Public marking directory
AP431AY	—	SOT-89-3L	Public marking directory
BZX884-B3V6	—	SOD-882	Public marking directory
EDZ27B	—	SOD-523	Public marking directory
ELM9825AB	—	SOT-89	Public marking directory
FSS16	—	DO-214AC	Public marking directory
HVC317B	—	UFP	Public marking directory
LM4915LQ	—	—	Public marking directory
MC2844	—	SC-70	Public marking directory
MC2854	—	SC-90	Public marking directory
R1111N251A	—	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 “A”

AL AH-16 A1 A2 A3 A4 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.