PNDS / Marking codes / H4

Identify an unknown SMD part: marking code “H4”

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 12 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
2SC3134-4	TOS ^*	SOT-23	Public marking directory
BCW69R	PHI	SOT-23R	Public marking directory
BZX585-C8V2	NXP	SOD-523	Public marking directory
CMOZ8V2	CSC CENTRAL SEMIC.CORP. ^*	SOD-523	Public marking directory
MMSZ5229B	FSC	SOD-123	Public marking directory
MMSZ5244B	FSC	SOD-123	Public marking directory
R3113D441C	RICOH ^*	—	Public marking directory
R3114Q311C	RICOH ^*	SC-82AB	Public marking directory
RN2905FS	TOS	—	Public marking directory
SST5484	SILICONIX-VISHAY	SOT-23	Public marking directory
TC7SH32F	TOS	SC-59	Public marking directory
TC7SH32FU	TOS	SOT-353	Public marking directory
2SA956-4	—	SOT-23	Public marking directory
AP130-31R	—	SOT-23	Public marking directory
AP130-31YR	—	SOT-89	Public marking directory
ELM7624HAB	—	SOT-23 16vdc VD7 3d Elm	Public marking directory
HVM121WK	—	SOT-23	Public marking directory
KA4A4P	—	SC-75	Public marking directory
MC74HC1G32DF	—	SOT-353	Public marking directory
MC74HC1G32DT	—	SOT-23-5	Public marking directory
MMSZ52344	—	SOD-123	Public marking directory
R1111N441B	—	SOT-23-5	Public marking directory
R1131D241A	—	—	Public marking directory
R3130N34EA	—	SOT-23	Public marking directory
RP103Q311B	—	SC-82AB	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 “H”

H0 H1 H2 H3 H5 HA HC HD HE HF

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.