Developed in the late 1940’s 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. BNC’s 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 useable 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 avail-
able 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 our 50 Ω BNC connectors are recognized under the Component program of Underwriter’s 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 telecommunications
applications as well as for plenum and other cables, these connectors feature crimp-crimp cable afﬁxment for quick and
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. Amphenol’s commercial grade
connector offering carries the part number designation “RFX” for easy recognition. These low-cost connectors typically
utilize die cast and molded components.
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.
50 Ω BNC Speciﬁcations
Impedance 50 Ω nominal
Frequency range DC - 4 GHz (usable to 11 GHz)
VSWR 1.3 max. @ DC - 4 GHz (straight)
1.35 max. @ DC - 4 GHz (right-angle)
RF-leakage 55 dB minimum @ 3 GHz
Voltage rating (at sea level) ≥ 500 V peak (depending on cable)
Contact resistance center contact: ≤ 1.5 mΩ
outer contact: ≤ 0.2 mΩ
braid to body: ≤ 0.1 mΩ
Insulation resistance 5,000 MΩ minimum
Insertion loss maximum 0.2 dB max. @ 3 GHz
Dielectric withstanding voltage 1,500 Vrms (at sea level)
Mating 2-stud bayonet lock coupling (MIL-STD-348)
Attachment method (inner / outer) Crimp, clamp
Coupling torque, min./max. 0.6 / 2.5 in-lbs (7 / 28 N-cm)
Coupling nut retention force 101 lbs (450N) min.
Center contact retention force ≥ 6.1 lbs (27N)
Braid/Jacket cable afﬁxment Hex crimp or screw-threaded clamps
Center conductor cable afﬁxment Crimp or solder
Engagement force ≤ 5 lbs (22N)
Disengagement force ≥ 1.5 lbs (7N)
Durability (matings) 500 cycles minimum
Temperature range -65°C to +165°C
- copolymer of styrene: -55°C to +85°C
Hermetic seals Helium leak test, 2 x 10^8 cc/sec.
Thermal shock MIL-STD-202, method 102, cond. D
Moisture resistance MIL-STD-202, method 106
Corrosion MIL-STD-202, method 101, cond. B
Vibration MIL-STD-202, method 204, cond. D
Mechanical shock MIL-STD-202, method 202
Altitude MIL-STD-202, method 105, cond. C
Note: These characteristics are typical but may not apply to all connectors.