{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"903-370P-51S","brand":"Amphenol","brandSlug":"amphenol","productSlug":"903-370P-51S","canonicalUrl":"https://icsourcedirect.com/amphenol/903-370P-51S","factsUrl":"https://icsourcedirect.com/api/mcp/products/903-370P-51S","rawCanonicalId":null},"summary":{"shortDescription":"Amphenol SMB snap-on plug, 903-370P-51S, female socket, 50 Ohm, 4 GHz, 0.3 dB insertion loss, crimp shield, solder contact, RG-174 cable group, nickel body, 500 mating cycles, bulk.","salesMarkdown":"## SMB Snap-On Plug for RG-174 Family — 4 GHz, 50 Ohm It is a field-terminable kit — the bulk package includes all five pieces needed for one complete assembly: the connector body, the center contact, the ferrule, the insulator, and the rear body. The 4 GHz frequency ceiling and 0.3 dB insertion loss define this connector's usable bandwidth for clean signal transfer. At 4 GHz, a 0.3 dB loss per mated pair is low enough that a single interconnect in a cable run will not dominate the link budget — it is the kind of performance you expect from a well-made SMB interface with a PTFE dielectric. ## Cable Compatibility and Field Assembly — What's in the Kit The 903-370P-51S is built for the RG-174 family — RG-174, 179, 187, 188, and 316 — all of which share a similar outer diameter and dielectric size. The shield termination is crimp, the center contact is solder. The kit approach (connector body, contact, ferrule, insulator, rear body) means you have everything except the cable and tools to make one cable assembly. ## How This Compares to the Gold-Body 142194 Both are 50 Ohm, single-port SMB plugs for RG-174-family cables, with 500 mating cycles and crimp shield / solder contact termination. The meaningful difference is in the body finish and insertion loss: the 142194 uses a gold body finish (vs nickel on the 903-370P-51S) and has a higher insertion loss of 0.6 dB (vs 0.3 dB). Gold body finish gives better corrosion resistance in humid or outdoor-adjacent environments, but the 0.3 dB loss advantage of the 903-370P-51S makes it the cleaner choice for signal-path-sensitive applications where every tenth of a dB matters. The 142194 also ships as a 4-piece kit (no insulator listed separately) and includes a heat shrink instead of a rear body — a different assembly workflow.","metaTitle":"Amphenol 903-370P-51S SMB Plug, 4 GHz, 50 Ohm, RG-174","metaDescription":"Amphenol 903-370P-51S SMB snap-on plug, female socket, 50 Ohm, 4 GHz max, 0.3 dB insertion loss. Kit includes connector, contact, ferrule, insulator, rear body.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["RF / Coaxial Connectors","RF Cable Assemblies"],"specifications":{"Mfr":"Amphenol RF","Series":"-","Package":"Bulk","Features":"-","Includes":"5 pcs - 1 Connector, 1 Contact, 1 Ferrule, 1 Insulator, 1 Rear Body","Impedance":"50Ohm","Body Finish":"Nickel","Cable Group":"RG-174, 179, 187, 188, 316","Body Material":"Brass","Housing Color":"Silver","Mating Cycles":"500","Mounting Type":"Free Hanging (In-Line)","Connector Type":"Plug, Female Socket","Fastening Type":"Snap-On","Insertion Loss":"0.3dB","Product Status":"Active","Connector Style":"SMB","Frequency - Max":"4 GHz","Number of Ports":"1","lifecycle_stage":"unknown","Mounting Feature":"-","Ingress Protection":"-","Shield Termination":"Crimp","Base Product Number":"903-370P","Contact Termination":"Solder","Dielectric Material":"Polytetrafluoroethylene (PTFE)","Operating Temperature":"-65°C~165°C","Center Contact Plating":"Gold","Center Contact Material":"Beryllium Copper"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$14.0400","stockQuantity":27,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy 903-370P-51S available via RFQ confirmation?","answer":"The 903-370P-51S is available to order through independent distribution. Submit an RFQ for your required quantity to get a firm price and lead time."},{"question":"What cables are compatible with 903-370P-51S?","answer":"The 903-370P-51S is designed for RG-174, RG-179, RG-187, RG-188, and RG-316 coaxial cables."},{"question":"Does 903-370P-51S include all 5 pieces (connector, contact, ferrule, insulator, rear body)?","answer":"Yes, the bulk package includes all five pieces needed for one complete assembly: 1 connector body, 1 center contact, 1 ferrule, 1 insulator, and 1 rear body."},{"question":"Is 903-370P-51S a male or female connector?","answer":"The 903-370P-51S is a plug with a female socket contact — it accepts the male pin of a mating SMB jack."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"isd-matrix-langgraph","citationUrl":"https://icsourcedirect.com/amphenol/903-370P-51S","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/amphenol/903-370P-51S when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-23T20:41:44.623Z","lastPublished":"2026-07-23T20:41:44.623Z","indexable":true}}