The TNC connector is a threaded weatherproof version of the BNC connector with a 50 Ω impedance and operates best in the range of DC to 11 GHz frequency spectrum. Most TNC connectors are 50-ohm type even when operated with coaxial cable of other impedances. However, a 75-ohm series is also available, providing a good SWR to about 1 GHz. The TNC series shares its interface design with the BNC series, utilizing a threaded coupling nut to ensure mating and higher frequency performance than the BNC.
Because of the versatility and durability, TNC connectors are excellent for a variety of applications.


  • Threaded coupling interface ensures connector with not de-couple in vibration-intense applications
  • Durable construction
  • Expansive product line includes designs for many common cable types


  • Antennas
  • Industrial
  • Wireless
  • Military
  • Broadband


TNC Connectors Specifications – 50Ohm
Frequency RangeDC – 11 GHz (DC – 18 GHz on Extended Range Designs)
Voltage Rating500 Volts Peak
Dielectric Withstanding Voltage1500 VRMS Max
VSWR (Return Loss)
     DC – 11 GHz1.3 (-18 dB) Max
Insulation Resistance5000 MΩ Min
Center Contact Resistance1.5 mΩ Max
Outer Contact Resistance0.2 mΩ Max
RF Leakage-60 dB Max @ 3 GHz
Insertion Loss


TNC Connectors Specifications – 75Ohm
Frequency rangeDC to 4 GHz (max.)
DC to 1.5 GHz (opt.)
Return loss (cable connector straight)≥ 20 dB (typ.)
Insertion loss≤ 0.1 x √ f [GHz] dB
Insulation resistance≥ 5 GΩ
Center contact resistance≤ 1.5 mΩ
Outer contact resistance≤ 1 mΩ
Test voltage1500 V rms
Working voltage500 V rms
Power handling80 W @ 2 GHz

Note: These characteristics are typical and may not apply to all connectors.