PNDS / Marking codes / 45

Identify an unknown SMD part: marking code “45”

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 18 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
1PS75SB45	NEXPERIA	SOT-416	Public marking directory
1PS75SB45	PHI	SC-75/SOT416	Public marking directory
1PS89SB16	PHI	SOT-490	Public marking directory
1PS89SB16	PHI	SC-89/SOT490	Public marking directory
BAS40-05	PHI	SOT-23	Public marking directory
BAS40-05T	MCC	SOT-523	Public marking directory
BAS40-05W	INFINEON	SOT-323	Public marking directory
BAS40-06	DIODES	—	Public marking directory
BAS40-06	MCC	SOT-23	Public marking directory
BAT14-055R	INFINEON	SOT173	Public marking directory
BAT14-055S	INFINEON	SOT173	Public marking directory
DTC124XE	ROHM	SOT-416	Public marking directory
DTC124XKA	ROHM	SOT-346	Public marking directory
DTC124XUA	ROHM	—	Public marking directory
R3111Q451B	RICOH ^*	SC-82AB	Public marking directory
RN5RF45AA	RICOH ^*	SOT-23-5	Public marking directory
RN5RZ45AA	RICOH ^*	SOT-23-5	Public marking directory
UDZS15B	ROHM ^*	—	Public marking directory
BAS40T-05	—	SOT-523 16dg - 3b Di	Public marking directory
CHDTC143TMPT	—	SOT-723 18ta - 3a Chm	Public marking directory
DTC124XM	—	—	Public marking directory
EDZ15B	—	SOD-523	Public marking directory
ELM9845BB	—	SOT-23 16cg VR1 3d Elm	Public marking directory
HMSZ5245B	—	SOD-323	Public marking directory
R1223N302H	—	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 “4”

482I 43 44 4C 47 4B 4D 46 4E 40

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.