ST Simplex Multimode Coupler — 501381-1
The TE Connectivity 501381-1 is a simplex multimode fiber optic coupler with ST receptacle on both ends — a straight-through adapter for joining two ST-terminated cables. The zinc housing with silver finish mounts to a panel or bulkhead, and a dust cap is included to protect the ferrule when the port is unused. The ferrule alignment sleeve is glass-filled polyphenylene sulfide (PPS), rated UL94 V-0. Operating temperature spans -20°C to 75°C.
Sourcing Reality — Obsolete Status
The 501381-1 is marked Obsolete by the manufacturer. No official replacement order code is listed. If you are designing a new panel, consider a current-production ST simplex coupler from the same interface family to avoid an orphan port on the shelf.
Both adapter ends are ST receptacles — this coupler mates with any standard ST connector. The simplex configuration handles one fiber channel per coupler.