{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"501933-4","brand":"TE Connectivity AMP Connectors","brandSlug":"te-connectivity-amp-connectors","productSlug":"501933-4","canonicalUrl":"https://icsourcedirect.com/te-connectivity-amp-connectors/501933-4","factsUrl":"https://icsourcedirect.com/api/mcp/products/501933-4","rawCanonicalId":null},"summary":{"shortDescription":"TE Connectivity 501933-4, Duplex, Multimode, Adapter, FSD Receptacle to ST Receptacle, Beige, Panel Mount, Flange, S-Keyed, with Dust Cap.","salesMarkdown":"The TE Connectivity 501933-4 is a duplex multimode fibre optic adapter that converts from an FSD receptacle to an ST receptacle. It is a panel-mount flange design, housed in a beige plastic body, and includes a dust cap. The S-keying ensures correct polarity alignment in duplex systems, preventing a flipped pair from being inserted the wrong way. This is the part to specify when a patch panel or bulkhead needs to transition between FSD-terminated patch cords and ST-terminated equipment ports. ## Installation and Polarity Check The flange mounting requires a rectangular panel cutout matching the adapter body dimensions — the flange sits flush against the panel face and is secured with hardware (not included). The S-keyed alignment slot forces the duplex pair to mate in the correct orientation, so the transmit and receive fibres land on the right ports. The included dust cap protects the internal alignment sleeve when the adapter is unmated; leave it on during shipment or storage to keep the ferrule bores clean.","metaTitle":"TE Connectivity 501933-4 Duplex ST/FSD Adapter, Multimode","metaDescription":"TE Connectivity 501933-4 duplex adapter converts FSD to ST receptacles. Multimode, beige plastic housing, S-keyed with dust cap. Panel mount.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["RF / Coaxial Connectors"],"specifications":{"Mfr":"TE Connectivity AMP Connectors","Mode":"Multimode","Type":"Adapter","Color":"Beige","Series":"-","Package":"Box","Features":"Dust Cap, S-Keyed","Mounting Type":"Panel Mount, Flange","Product Status":"Active","Simplex/Duplex":"Duplex","lifecycle_stage":"unknown","Ferrule Material":"-","Housing Material":"Plastic","Ingress Protection":"-","Base Product Number":"501933","Operating Temperature":"-","Convert To (Adapter End)":"ST Receptacle","Convert From (Adapter End)":"FSD Receptacle","Material Flammability Rating":"-"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$12.6750","stockQuantity":47,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icsourcedirect.com/029471879d25e4d04ecd8d0a30e59c82.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What does 501933-4 convert between?","answer":"The 501933-4 converts from an FSD receptacle to an ST receptacle. It is a duplex multimode adapter, so it handles two fibres — one transmit, one receive — and the S-keying ensures the correct polarity alignment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"isd-matrix-langgraph","citationUrl":"https://icsourcedirect.com/te-connectivity-amp-connectors/501933-4","citationPolicyUrl":"https://icsourcedirect.com/llms.txt","source":"IC Source Direct","attribution":"Open for AI and search answers: credit \"IC Source Direct\" and link https://icsourcedirect.com/te-connectivity-amp-connectors/501933-4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:46:37.382Z","lastPublished":"2026-07-22T19:46:37.382Z","indexable":true}}