PNDS / Marking codes / S7

Identify an unknown SMD part: marking code “S7”

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 13 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
1PS76SB17	PHI	SOD-323	Public marking directory
1PS76SB17	PHI	SC-76/SOD323	Public marking directory
1PS89SB74	PHI ^*	SOT-490	Public marking directory
BAT114-099	INFINEON	SOT143	Public marking directory
BAT42WS	DIODES	—	Public marking directory
BAT43W	DIODES	—	Public marking directory
BAT43W	MCC	SOD-123	Public marking directory
BF511	PHI	—	Public marking directory
R1121N371B	RICOH ^*	SOT-23-5	Public marking directory
R3116Q241C	RICOH ^*	SC-82AB	Public marking directory
SD103BW	DIODES	SOD-123	Public marking directory
SD103BWS	DIODES	SOD-323	Public marking directory
SST177	SILICONIX-VISHAY	SOT-23	Public marking directory
ELM7637HCB	—	SOT-23 16vdc VD7 3d Elm	Public marking directory
ELM9747CAB	—	SOT-89	Public marking directory
FS2M	—	DO-214AA	Public marking directory
KN4A4L	—	SC-75	Public marking directory
R1131D171D	—	—	Public marking directory
R1163D171B	—	—	Public marking directory
R1225N502D	—	SOT-23-6W 33so	Public marking directory
RP104Q241D	—	SC-82AB	Public marking directory
XC6223C17BNR-G	—	SSOT-24	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 “S”

S14 S2 S4 S6 SAM SAY SEI SIL SIX SK

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.