{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"031-70539-12G","brand":"Amphenol","brandSlug":"amphenol","productSlug":"031-70539-12G","canonicalUrl":"https://icsourcedirect.com/amphenol/031-70539-12G","factsUrl":"https://icsourcedirect.com/api/mcp/products/031-70539-12G","rawCanonicalId":null},"summary":{"shortDescription":"Amphenol RF 031-70539-12G BNC jack, female socket, 75 Ohm, 12 GHz, 500 mating cycles, crimp termination, nickel body, gold center contact, includes 4 pieces.","salesMarkdown":"## 75 Ohm BNC Crimp Jack for Belden 1794A / 4794R The 031-70539-12G: This is the 75 Ohm variant of the standard 50 Ohm BNC — the impedance mismatch between a 50 Ohm plug and 75 Ohm cable will cause a reflection at the interface, so matching the connector impedance to the cable is non-negotiable. Rated to 12 GHz with 500 mating cycles, it covers high-frequency video, broadcast, and data applications where signal integrity matters. ## 75 Ohm vs 50 Ohm — The Impedance Match The physical interface is identical — both use the same bayonet lock and center contact geometry — but the dielectric and center pin dimensions differ to achieve the target impedance. Using a 75 Ohm connector on a 50 Ohm cable (or vice versa) creates a mismatch that degrades return loss and signal amplitude, especially above a few hundred MHz. For Belden 1794A (75 Ohm) or 4794R (75 Ohm), this is the correct impedance. ## Crimp Kit Contents and Installation The kit ships with four pieces: the BNC jack body, one gold-plated center contact, one crimp ferrule, and one PTFE insulator. The center contact is crimped onto the cable center conductor, the ferrule is crimped over the braid and jacket, and the insulator positions the contact inside the body. The PTFE dielectric provides stable impedance and low loss up to 12 GHz. For Belden 1794A, the crimp die selection must match the cable diameter — the ferrule is sized for that cable group.","metaTitle":"Amphenol RF 031-70539-12G BNC Jack, 75 Ohm, 12 GHz","metaDescription":"Amphenol RF 031-70539-12G 75 Ohm BNC jack, female socket, bayonet lock, 12 GHz max, 500 mating cycles. Includes connector, contact, ferrule, insulator.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["RF / Coaxial Connectors"],"specifications":{"Mfr":"Amphenol RF","Series":"-","Package":"Bulk","Features":"-","Includes":"4 pcs - 1 Connector, 1 Contact, 1 Ferrule, 1 Insulator","Impedance":"75Ohm","Body Finish":"Nickel","Cable Group":"Belden 1794A, 4794R","Body Material":"Brass","Housing Color":"Silver","Mating Cycles":"500","Mounting Type":"Free Hanging (In-Line)","Connector Type":"Jack, Female Socket","Fastening Type":"Bayonet Lock","Insertion Loss":"-","Product Status":"Active","Connector Style":"BNC","Frequency - Max":"12 GHz","Number of Ports":"1","lifecycle_stage":"unknown","Mounting Feature":"-","Ingress Protection":"-","Shield Termination":"Crimp","Base Product Number":"031-70","Contact Termination":"Crimp","Dielectric Material":"Polytetrafluoroethylene (PTFE)","Operating Temperature":"-65°C~165°C","Center Contact Plating":"Gold","Center Contact Material":"Phosphor Bronze"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$11.0600","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icsourcedirect.com/28e9b633913a5791d151dba8f9bfea0a.pdf","sourceUrl":null,"alternativesUrl":"https://icsourcedirect.com/api/mcp/products/031-70539-12G/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 031-70539-12G and how do I get a price?","answer":"Submit a request with your quantity, and we will confirm availability and current pricing through our distribution network. No stock-holding claim is made; pricing is confirmed at quote time."},{"question":"Is 031-70539-12G a 75 ohm or 50 ohm BNC connector?","answer":"The 031-70539-12G is a 75 Ohm BNC connector. It is designed for 75 Ohm cable systems such as Belden 1794A and 4794R. The 50 Ohm variant is the 031-70539-12 (without the G suffix)."},{"question":"What cable groups are compatible with 031-70539-12G?","answer":"The 031-70539-12G is compatible with Belden 1794A and 4794R cable groups. The crimp ferrule and center contact are sized for these specific cables."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/amphenol/031-70539-12G","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/031-70539-12G 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}}