BNC Connector Series
Developed in the late 1940s as a miniature version of the Type C connector, BNC stands for Bayonet Neill Concelman and is named after Amphenol engineer Carl Concelman. The BNC product line is a miniature quick connect/disconnect RF connector. It features two bayonet lugs on the female connector; mating is achieved with only a quarter turn of the coupling nut. BNCs are ideally suited for cable termination for miniature to subminiature coaxial cable (RG-58, 59, to RG-179, RG-316, etc.)
Amphenol 50 Ω BNC connectors are miniature, lightweight units designed to operate up to 11 GHz and typically yield low reflection through 4 GHz. Designed to accommodate a large variety of RG and industry standard cables, BNC connectors are available in crimp/crimp, clamp/solder, SURETWIST, and field serviceable termination styles. A full line of printed circuit board receptacles, bulkhead receptacles, resistor terminations, and other accessories complement the product offering.
A variety of Amphenol 50 Ω BNC connectors are recognized under the Component program of Underwriters Laboratories, Inc. These connectors are ideal for use with medical equipment and test instrumentation where safety cannot be compromised.
Amphenol also offers a full line of 75 Ω BNC connectors to meet the needs for higher performance impedance-matched cable interconnections. These connectors can be used in a variety of applications where true 75 Ω performance is needed to insure low signal distortion. Designed for the most popular 75 Ω cables used in broadcast and CATV applications as well as for plenum and other cables, these connectors feature crimp-crimp cable affixment for quick and reliable installation.
Two distinct types of 75 Ω BNC's are available, and both mate with each other and with 50 ΩBNC's. Type 1 is designated 75 ΩBNC-T1 and provides constant 75 Ωperformance with low VSWR DC 4 GHz. Type 2 is designated 75 ΩBNC-T2 and is usable with low reflection DC - 1 GHz. For applications above 1 GHz, Type 1 is recommended.
Part numbers that are listed with the appropriate M39012 number are military grade connectors produced in accordance with and actively qualified to the military specification MIL-C-39012. Connectors not listed with the M39012 number constitute the industrial grade product offering. These connectors provide comparable performance and generally feature nickel-plated brass bodies, Teflon insulators, and either gold or silver-plated center contacts. Amphenols commercial grade connector offering carries the part number designation RFX for easy recognition. These low-cost connectors typically utilize die cast and molded components. While performance will not be equal to the industrial or military grade products, these connectors are ideal for use on a variety of commercial applications.
Reverse Polarity BNC's are also available. Reverse polarity is a keying system accomplished with a reverse interface, and ensures that reverse polarity interface connectors do not mate with standard interface connectors. Amphenol accomplishes this by inserting female contacts into plugs and male contacts into jacks. Other manufacturers may use reverse threading to accomplish reverse polarity keying.
Features & Benefits
• Bayonet coupling mechanism provides quick mating and unmating
• 50 Ωand 75 Ω impedance designs allow customers to match impedance to system requirements
• 50 Ωand 75 Ω connectors are intermateable to ensure non-destructive mating
• Three grades of connectors are available for military, industrial and commercial applications
• Antennas • Cable Modems • Medical Equipment
• Automotive • Components • Mil-Aero
• Base Stations • Computers/LANs • Radios
• Broadcast (75 Ω) • Instrumentation • Satcom
• Cable Assemblies • Oscilloscopes • Telecom
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50 Ω BNC Specifications
50 Ω nominal
0-4 GHz with low reflection
500 volts peak
Dielectric Withstanding Voltage
1,500 volts rms
M39012 straight connectors: 1.3 max 0-4 GHz
M39012 right angle connectors: 1.35 max 0-4 GHz
MIL-C-39012 Contact Resistance
Center contact: 1.5 mΩ; Outer contact: 0.2 mΩ
MIL-C-39012 Insulation Resistance
MIL-C 39012 Braid to Body
MIL-C-39012 RF Leakage
-55 dB min at 3 GHz
MIL-C-39012 Insertion Loss
0.2 dB min at 3 GHz
2-stud bayonet coupling per M39012
Braid/Jacket Cable Affixment
All crimps are hex braid; clamps are screw-thread net and braid clamp
Center Conductor Cable Affixment
Crimps are crimp or solder; all other are solder only
All crimps unless specified otherwise
Crimps: 20-100 lbs; All others: 30-70 lbs
Beryllium copper or phosphorous bronze, silver or gold-plated
Other Metal Parts
Brass, nickel finish; M39012 is silver finish
TFE, copolymer of styrene, glass-TFE (hermetically sealed)
TFE insulators: - 65°C to + 165 °C
Copolymer of Styrene: - 55°C to + 85°C
Clamps with clamp gaskets; crimps with heat-shrink tubing
Pass helium leak test of 2x10 -8 cc/second
MIL-STD-202 method 202
MIL-STD-202 method 202, test condition D
MIL-STD-202 method 106
MIL-STD-202 method 101, test condition B
MIL-STD-202 method 102, test condition D
MIL-STD-202 method 105, test condition C
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