PNDS / Marking codes / R8

Identify an unknown SMD part: marking code “R8”

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.

21 candidates 12 with manufacturer source-traceable

Candidate part numbers

Part number	Manufacturer	Package	Mapping source
BFG93A	INFINEON	SOT-143	Public marking directory
BZX84C6V2	FSC	SOT-23 16dc - 3a Lge	Public marking directory
BZX84C9V1TS	DIODES	—	Public marking directory
MM5Z13V	FSC	SOD-523	Public marking directory
PDZ4.7B	NXP	SOD-323	Public marking directory
R1121N281B	RICOH ^*	SOT-23-5	Public marking directory
R3111Q581A	RICOH ^*	SC-82AB	Public marking directory
R3116Q151C	RICOH ^*	SC-82AB	Public marking directory
TC54VN5802ECB	MIC ^*	SOT-23	Public marking directory
TC54VN5802MB	MIC ^*	SOT-89	Public marking directory
TK11480CM	TOKO ^*	SOT-23L-6	Public marking directory
TK11487CM	TOKO ^*	SOT-23L-6	Public marking directory
BZX84-C9V1T	—	SOT-523	Public marking directory
ELM7638LCB	—	SOT-23 16vdc VD7 3d Elm	Public marking directory
ELM9738CAB	—	SOT-89	Public marking directory
R1131D081D	—	—	Public marking directory
RP104Q261D	—	SC-82AB	Public marking directory
XC61CN5802M	—	SOT-23	Public marking directory
XC61CN5802N	—	SOT-143R	Public marking directory
XC61CN5802P	—	SOT-89	Public marking directory
XC6218P39N	—	SSOT-24	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 “R”

R1 R2 R3 R4 R5 R6 R7 RHM RE RB

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.