PNDS / Marking codes / X3

Identify an unknown SMD part: marking code “X3”

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.

23 candidates 14 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
2SK852-X3	TOS ^*	SOT-323 16fa - 3a Nec	Public marking directory
BD46392G	ROHM ^*	SSOP-5	Public marking directory
BZV49-C33	PHI	SOT-89	Public marking directory
BZX384-C62	NXP	SOD-323	Public marking directory
BZX84-C33	PHI	SOT-23	Public marking directory
BZX99-C15	PHI	SOT-23	Public marking directory
BZX99-C15	PHI	SOT23	Public marking directory
CMDZ5223B	CSC CENTRAL SEMIC.CORP. ^*	SOD-323	Public marking directory
MBRX140	MCC	SOD-123	Public marking directory
MMSZ20	ON ^*	SOD-123	Public marking directory
R3111Q431C	RICOH ^*	SC-82AB	Public marking directory
RN1131F	TOS	SOT-490	Public marking directory
RN1131FV	TOS	SOT-723	Public marking directory
TC1272-5ENB	MIC ^*	SOT-23	Public marking directory
2SK94-3	—	SOT-23 16fa - 3a Nec	Public marking directory
BZT52-C62	—	SOD-123	Public marking directory
BZX88-C33	—	SOT-323	Public marking directory
IMX3	—	SOT-363	Public marking directory
R1163D231D	—	—	Public marking directory
R1210N232C	—	SOT-23-5	Public marking directory
RP103Q171D	—	SC-82AB	Public marking directory
XC6223G13BNR-G	—	SSOT-24	Public marking directory
ZD5228BSG	—	SOD-323-S	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 “X”

XA XB XC XD XE XF XH XK XM XP

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.