Cable
RG178
RG178 Coaxial Cable
Custom RG178 cable assemblies. Choose from 95 compatible connectors and any length from 1 to 30 feet.
Specifications
Diameter
1.75MM
Impedance
50 Ohm
Frequency
DC – 3 GHz
Vel. Factor
69%
Max Voltage
500 VRMS
Shield
Silver-plated copper braid
Jacket
FEP
Bend Radius
0.25 in (6mm)
Weight
0.5 lb/100ft
Temp Range
-55°C to +200°C
About RG178
RG-178 is an extremely thin 50-ohm coaxial cable measuring just 1.75mm in diameter, designed for space-constrained RF assemblies. Its PTFE dielectric and silver-plated conductors deliver reliable performance from DC up to several GHz. Commonly used for internal wiring in test equipment, medical devices, and cellular module pigtails.
Attenuation (dB per 100 ft)
100 MHz
7.5 dB
450 MHz
16.5 dB
900 MHz
24.0 dB
1.8 GHz
35.0 dB
2.4 GHz
42.0 dB
5.8 GHz
70.0 dB
Select End A Connector (95 available)
Choose the connector for the first end of your cable.
Select End B Connector
Choose the connector for the second end.
Common Applications
Frequently Asked Questions
What connectors are compatible with RG178?
RG178 is compatible with 95 connector types including SMA MALE, SMA FEMALE, RP-SMA MALE, RP-SMA FEMALE, SMA MALE ANGLE, and more. All connectors can be paired in any combination.
What is the impedance of RG178?
50 Ohm — standard for RF systems, test equipment, and antenna feedlines.
What frequency range does RG178 support?
RG178 supports frequencies from DC to DC – 3 GHz.
How are RG178 cables assembled?
Every RG178 cable assembly is hand-terminated and continuity tested at our US facility before shipping. We do not drop-ship pre-made cables — each one is built to your specifications.
What lengths are available for RG178?
RG178 is available from 1 ft up to 30 ft. Use the cable builder for any custom length.