PNDS / Marking codes / WT

Identify an unknown SMD part: marking code “WT”

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 14 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BCR166	INFINEON	SOT23	Public marking directory
BCR166L3	INFINEON	—	Public marking directory
BCR166W	INFINEON	SOT323	Public marking directory
BCR48PN	INFINEON	SOT363	Public marking directory
BD46231G	ROHM ^*	SSOP-5	Public marking directory
BZT52C39LP	DIODES	—	Public marking directory
BZT52C39S	MCC	SOD-323	Public marking directory
BZT52C39T	MCC	SOD-523	Public marking directory
BZT52C3V0	DIODES	—	Public marking directory
BZX284-B3V9	PHI	SOD-110	Public marking directory
BZX284-B3V9	PHI	SOD110	Public marking directory
BZX384-C30	NXP	SOD-323	Public marking directory
BZX84-C30	PHI	SOT-23	Public marking directory
R5325N027B	RICOH ^*	SOT-23-6	Public marking directory
2SA1020PT-Y	—	SOT-23 16ta - 3a Chm	Public marking directory
2SC4694	—	—	Public marking directory
2SC4695	—	SOT-23	Public marking directory
2SK322-T	—	SOT-23 16fa - 3a Ren	Public marking directory
BZT52-C30	—	SOD-123	Public marking directory
BZT52-C30S	—	SOD-323	Public marking directory
BZT52-C39	—	SOD-123	Public marking directory
BZT52-C39S	—	SOD-323	Public marking directory
BZX84-C30W	—	SOT-323	Public marking directory
CD214A-T78CA	—	DO-214AC	Public marking directory
MM3Z39V	—	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 “W”

WG WI W1 W2 W3 W4 W5 W6 W7 W8

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.