{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"112740-20","brand":"Amphenol","brandSlug":"amphenol","productSlug":"112740-20","canonicalUrl":"https://icsourcedirect.com/amphenol/112740-20","factsUrl":"https://icsourcedirect.com/api/mcp/products/112740-20","rawCanonicalId":null},"summary":{"shortDescription":"Amphenol RF BNC jack, 75 Ohm, 1 port, bulkhead front-side nut, solder termination, gold body, 4 GHz, 500 V, 500 cycles.","salesMarkdown":"## 75 Ohm BNC for video and broadcast — the 112740-20 75 Ohm variant of the standard BNC — the centre conductor and dielectric are sized to hold the 75 Ohm line impedance across the mated pair. A 50 Ohm BNC on a 75 Ohm cable or vice versa creates a reflection at the junction that degrades return loss — noticeable as ghosting in analog video or bit errors in HD-SDI. This jack is built for the 75 Ohm ecosystem: RG59, RG6, and Belden 1855A cable assemblies. Frequency range runs to 4 GHz. The insertion loss is specified at 0.2 dB. ## Mounting and termination — what arrives in the bag The 112740-20 is a bulkhead-mount jack with front-side nut retention. The package includes three pieces: the connector body with the centre contact pre-installed, a lockwasher to prevent the nut from backing off under vibration, and a hex nut. The user supplies the panel cutout and the cable. Termination is solder-only — the centre contact has a solder cup for the signal wire, and the shield termination is a solder bucket that accepts the braid. No crimp tooling required, but the installer needs a soldering iron rated for the brass body's thermal mass. The board-edge, end-launch mounting option allows the jack to sit flush with the PCB edge for a clean RF launch. The bayonet lock (BNC standard) gives a quarter-turn mate with positive engagement. The locking studs on the jack body engage the slots in the mating plug; the spring-loaded sleeve snaps the pair together. No tools needed for mating or unmating. The 112740-20 is listed as Active on the manufacturer's lifecycle record.","metaTitle":"Amphenol RF 112740-20 BNC Jack, 75 Ohm, 4 GHz, Bulkhead","metaDescription":"Amphenol RF 112740-20 BNC jack, 75 Ohm impedance, 4 GHz max frequency, 500 mating cycles. Includes connector, lockwasher, nut. Solder termination, gold body.","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":"3 pcs - 1 Connector, 1 Lockwasher, 1 Nut","Impedance":"75Ohm","Body Finish":"Gold","Cable Group":"-","Body Material":"Brass","Housing Color":"Gold","Mating Cycles":"500","Mounting Type":"Board Edge, End Launch; Panel Mount","Connector Type":"Jack, Female Socket","Fastening Type":"Bayonet Lock","Insertion Loss":"0.2dB","Product Status":"Active","Voltage Rating":"500 V","Connector Style":"BNC","Frequency - Max":"4 GHz","Number of Ports":"1","lifecycle_stage":"unknown","Mounting Feature":"Bulkhead - Front Side Nut","Ingress Protection":"-","Shield Termination":"Solder","Base Product Number":"112740","Contact Termination":"Solder","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":"$4.0400","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icsourcedirect.com/2544f4aa98978582c4b2f73cd5d18d1c.pdf","sourceUrl":null,"alternativesUrl":"https://icsourcedirect.com/api/mcp/products/112740-20/alternatives.json"},"ai":{"faq":[{"question":"What is the impedance of the 112740-20?","answer":"It is designed for 75 Ohm cable systems such as RG59 and RG6."},{"question":"Is the 112740-20 compatible with RG59 cable?","answer":"Yes, the 75 Ohm impedance of the 112740-20 matches RG59 cable. The solder termination accepts the centre conductor and braid of standard RG59 assemblies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icsourcedirect.com/amphenol/112740-20","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/112740-20 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}}