PNDS / Marking codes / A6

Identify an unknown SMD part: marking code “A6”

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
1SS399	TOS	SOT-143	Public marking directory
BAS16	FSC	SOT-23	Public marking directory
BAS16-02L	INFINEON	—	Public marking directory
BAS16-02W	INFINEON	—	Public marking directory
BAS16-07L4	INFINEON	—	Public marking directory
BAS16H	NXP	SOD-323	Public marking directory
BAS16T	NXP	SOT-416	Public marking directory
BAS16T	PHI	SC-75/SOT416	Public marking directory
BAS16T	DIODES	—	Public marking directory
BAS16T	MCC	SOT-523	Public marking directory
BAS16W	NXP	SOT-323	Public marking directory
BAS16W	PHI	SC-70/SOT323	Public marking directory
BAS19	MCC	SOT-23	Public marking directory
BAS216	PHI	SOD-110	Public marking directory
BAS216	PHI	SOD110	Public marking directory
BAS316	PHI	SOD-323	Public marking directory
BAV16W	DIODES	SOD-123	Public marking directory
BAV16WS	DIODES	SOD-323	Public marking directory
BZX79-A5V6	PHI	SOD27 (DO35)	Public marking directory
BZX884-B3V9	NXP	SOD-882	Public marking directory
LM4904ITL	NSC ^*	BGA-9	Public marking directory
LM4904ITLX	NSC ^*	BGA-9	Public marking directory
MC2838	MOT ^*	SC-59	Public marking directory
MMBD2836	MOT	SOT23	Public marking directory
MMBD4448HTA	DIODES	SOT-523	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 A5 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.