{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"903-499J-51P2","brand":"Amphenol","brandSlug":"amphenol","productSlug":"903-499J-51P2","canonicalUrl":"https://icsourcedirect.com/amphenol/903-499J-51P2","factsUrl":"https://icsourcedirect.com/api/mcp/products/903-499J-51P2","rawCanonicalId":null},"summary":{"shortDescription":"SMB jack, male pin, 50 Ohm, 4 GHz, 0.3 dB insertion loss, gold body, through hole, snap-on, 1 port, bulk.","salesMarkdown":"## 50 Ohm SMB Jack for 4 GHz Signal Paths The 903-499J-51P2: The gold-plated zinc die cast body and gold-plated brass center contact handle 500 mating cycles with consistent contact resistance — the gold finish prevents corrosion in repeated mate/unmate field service. Insertion loss holds at 0.3 dB across the band, which keeps the link budget clean for a single mated pair in test equipment, telecom infrastructure, or instrumentation. ## What Crosses When It's Dry? The 903-415J-51P is the closest functional peer — same SMB style, 50 Ohm impedance, 4 GHz frequency cap, 0.3 dB insertion loss, gold body finish, and 500 mating cycles. The difference is body material: the 903-499J-51P2 uses zinc die cast, while the 903-415J-51P uses brass. For most RF signal paths the electrical performance is identical; the brass body on the 903-415J-51P is slightly harder, which can matter in high-vibration environments where the snap-on retention sees repeated shock. If the BOM calls for non-magnetic materials, the 903-NM415J-51P with beryllium copper contacts is the path — same 4 GHz and 50 Ohm spec.","metaTitle":"903-499J-51P2 SMB Jack, 50 Ohm, 4 GHz, Gold, Through Hole","metaDescription":"903-499J-51P2 SMB jack, male pin, 50 Ohm impedance, 4 GHz max frequency, 0.3 dB insertion loss, gold-plated zinc die cast body, 500 mating cycles.","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":"-","Impedance":"50Ohm","Body Finish":"Gold","Cable Group":"-","Body Material":"Zinc Die Cast","Housing Color":"Gold","Mating Cycles":"500","Mounting Type":"Through Hole","Connector Type":"Jack, Male Pin","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":"Solder","Base Product Number":"903-499J","Contact Termination":"Solder","Dielectric Material":"Polytetrafluoroethylene (PTFE)","Operating Temperature":"-65°C~165°C","Center Contact Plating":"Gold","Center Contact Material":"Brass"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$8.0700","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://icsourcedirect.com/api/mcp/products/903-499J-51P2/alternatives.json"},"ai":{"faq":[{"question":"What is the impedance of the 903-499J-51P2?","answer":"The 903-499J-51P2 is a 50 Ohm nominal impedance SMB jack, matched for standard 50 Ohm RF systems."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/amphenol/903-499J-51P2","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/903-499J-51P2 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}}