{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"APH-FKJ-SMAJ","brand":"Amphenol","brandSlug":"amphenol","productSlug":"APH-FKJ-SMAJ","canonicalUrl":"https://icsourcedirect.com/amphenol/APH-FKJ-SMAJ","factsUrl":"https://icsourcedirect.com/api/mcp/products/APH-FKJ-SMAJ","rawCanonicalId":null},"summary":{"shortDescription":"Amphenol RF between-series adapter, APH-FKJ-SMAJ, SMA jack to SMB Fakra jack, straight, 50 Ohms, 4 GHz, nickel-plated brass body, gold-plated beryllium copper center contacts, bulk.","salesMarkdown":"## Between-Series Adapter: SMA Jack to SMB Fakra Jack The Amphenol APH-FKJ-SMAJ is a between-series coaxial adapter that converts an SMA jack, female socket to an SMB Fakra jack, male pin. It's the part you reach for when a harness has an SMA bulkhead on one end and needs to terminate into an SMB Fakra interface — common in automotive telematics or antenna feed systems where the Fakra latch is preferred over a threaded SMA for quick disconnect. ## 50 Ohm, 4 GHz — What the Bandwidth Means The 4 GHz ceiling covers L-band, S-band, and most of the C-band up to the lower 4 GHz ISM allocation — so it handles GNSS, Wi-Fi, and cellular bands through LTE. Above 4 GHz the adapter's internal geometry starts to introduce mismatch loss; if your signal runs at higher frequencies, you need a different adapter rated for that range. ## Construction and Field Life The body is machined brass with a nickel finish — nickel holds up better against corrosion than bare brass in humid or salt-spray environments, though it's not a marine-grade finish. That wide operating range means it can sit in an engine bay or a rooftop enclosure without the dielectric shifting phase or the plating fretting from thermal cycling. ## SMA Threaded, SMB Fakra Snap-On — Two Locking Styles The SMA end uses a threaded coupling nut. The SMB Fakra end uses a snap-on latch with a colored plastic housing (the Fakra keying code, typically A through Z). The threaded side stays put under vibration; the snap-on side is what you disconnect repeatedly during service without tools. If your application sees constant vibration on both sides, the snap-on Fakra latch can wear over time — the 500-cycle rating on the adapter is a practical limit before the retention force drops.","metaTitle":"Amphenol APH-FKJ-SMAJ SMA to SMB Fakra Adapter, 50 Ohm","metaDescription":"Amphenol APH-FKJ-SMAJ between-series adapter converts SMA jack to SMB Fakra jack. 50 Ohm impedance, 4 GHz max frequency, straight body, nickel-plated brass.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["RF / Coaxial Connectors"],"specifications":{"Mfr":"Amphenol RF","Style":"Straight","Series":"-","Package":"Bulk","Features":"-","Includes":"-","Impedance":"50 Ohms","Body Finish":"Nickel","Adapter Type":"Jack to Jack","Body Material":"Brass","Center Gender":"Female to Male","Mating Cycles":"500","Mounting Type":"Free Hanging (In-Line)","Adapter Series":"SMA to SMB Fakra","Fastening Type":"Snap-On, Threaded","Insertion Loss":"-","Product Status":"Active","Conversion Type":"Between Series","Frequency - Max":"4 GHz","lifecycle_stage":"unknown","Mounting Feature":"-","Ingress Protection":"-","Base Product Number":"APH-FKJ","Dielectric Material":"Polytetrafluoroethylene (PTFE)","Operating Temperature":"-40°C ~ 155°C","Center Contact Plating":"Gold","Center Contact Material":"Beryllium Copper","Convert To (Adapter End)":"SMA Jack, Female Socket","Convert From (Adapter End)":"SMB Fakra Jack, Male Pin"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$36.0600","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icsourcedirect.com/d070412a21755d7d6c114f893e40ba1f.pdf","sourceUrl":null,"alternativesUrl":"https://icsourcedirect.com/api/mcp/products/APH-FKJ-SMAJ/alternatives.json"},"ai":{"faq":[{"question":"What is the impedance of APH-FKJ-SMAJ?","answer":"The APH-FKJ-SMAJ is a 50 Ohm adapter, matching the standard impedance for most RF systems including cellular, GPS, and Wi-Fi."},{"question":"Where can I buy APH-FKJ-SMAJ?","answer":"The APH-FKJ-SMAJ is an active-production part sourced per RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/amphenol/APH-FKJ-SMAJ","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/APH-FKJ-SMAJ 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}}