PNDS / Marking codes / 1F

Identify an unknown SMD part: marking code “1F”

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 22 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
2SC4543	MATSUSHITA	SOT-89	Public marking directory
BC847B	PHI	SOT-23	Public marking directory
BC847BDW	ON	SOT-363	Public marking directory
BC847BF	INFINEON	SOT-490	Public marking directory
BC847BLP	DIODES	DFN1006-3 22ta - 2a Di	Public marking directory
BC847BS	DIODES	—	Public marking directory
BC847BT	PHI	SOT-416	Public marking directory
BC847BT	PHI	SC-75/ SOT416	Public marking directory
BC847BV	DIODES	SOT-666	Public marking directory
BC847BV	DIODES	—	Public marking directory
BC847BV	MCC	SOT-563	Public marking directory
BC847BW	PHI	SOT-323	Public marking directory
BC847C	MCC	SOT-23	Public marking directory
BU4346F	ROHM ^*	SOP-4	Public marking directory
BU4346FWE	ROHM ^*	VSOF-5	Public marking directory
BU4346G	ROHM ^*	SSOP-5	Public marking directory
KST5550	FSC	SOT-23	Public marking directory
MAZD024	PANASONIC ^*	—	Public marking directory
MM5Z68V	FSC	SOD-523	Public marking directory
MMBT5550	FSC	SOT23	Public marking directory
R3111N511A	RICOH ^*	SOT-23-5	Public marking directory
RQ5RW15BA	RICOH ^*	SOT-143R	Public marking directory
2SC5838	—	ML3-N2 22ta - 2b Pan	Public marking directory
CH847BPT-R	—	SOT-23 16ta - 3a Chm	Public marking directory
MM3Z3V3	—	SOD-323	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 “1”

10 11 12 13 14 15 16 18 1A 1B

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.