PNDS / Marking codes / F5

Identify an unknown SMD part: marking code “F5”

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
1SS250	TOS	SOT-23	Public marking directory
1SS370	TOS	SOT-323	Public marking directory
2SC2814-5	TOS ^*	SOT-23	Public marking directory
2SC4399-5	TOS ^*	SOT-323	Public marking directory
BFS19R	PHI	SOT-23	Public marking directory
CMOZ3V6	CSC CENTRAL SEMIC.CORP. ^*	SOD-523	Public marking directory
KST1009-F5	FSC ^*	SOT-23	Public marking directory
MC78PC25N	ON ^*	SOT-23-5	Public marking directory
MMBC1009F5	MOT ^*	SOT-23	Public marking directory
MMBZ5240B	FSC	SOT-23	Public marking directory
MMBZ5240BW	DIODES	SOT-323	Public marking directory
MMSZ5240B	MCC	SOD-123	Public marking directory
MMSZ5240BS	DIODES	SOD-323	Public marking directory
MMSZ5240BS	DIODES	—	Public marking directory
MMSZ5241B	DIODES	—	Public marking directory
MMSZ5248B	FSC	SOD-123	Public marking directory
MMXZ5241B	MCC	SOD-323	Public marking directory
R3111N552A	RICOH ^*	SOT-23	Public marking directory
R3113D251C	RICOH ^*	—	Public marking directory
R3114Q121C	RICOH ^*	SC-82AB	Public marking directory
RN1906FS	TOS	—	Public marking directory
TC1073-3.3VCH	MIC ^*	SOT-23-6	Public marking directory
TC54VC5502ECB	MIC ^*	SOT-23	Public marking directory
TC54VC5502MB	MIC ^*	SOT-89	Public marking directory
UDZS36B	ROHM ^*	—	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 “F”

F F0 F1 F2 F3 F4 F6 F7 F8 F9

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.