50 Ohm ultra-compact PTFE RF coaxial cable for confined spaces

RG178B/U QAXIAL – Ultra-compact 50 Ohm PTFE RF coaxial cable for confined spaces

The RG178B/U QAXIAL coaxial cable is a 50 Ohm RF cable with PTFE dielectric, designed for applications where extremely small dimensions and high temperature resistance are primary requirements. With an outer diameter of just 1.80 mm, it is suitable for RF cabling in very limited spaces and high-density systems, with construction compliant with the MIL-C-17F standard.

Main technical characteristics

• Characteristic impedance: 50 Ohm (±2).
• Operating frequency: DC up to 3 GHz.
• Dielectric: PTFE for high electrical and thermal stability.
• Shielding: silver-plated copper (SPC) braid with 95% coverage.
• Capacitance: 96.5 pF/m; velocity of propagation: 69.5%.
• Minimum bending radius: 10 mm (single bend), 27 mm (multiple bends).
• Operating temperature: -55 / +200 °C.
• Working voltage: up to 900 VRMS (max).

Construction

• Center conductor: SCCS (silver-plated copper-clad steel), stranded 7 x 0.10 mm (Ø 0.31 mm).
• Dielectric: PTFE Ø 0.84 mm.
• Outer conductor: SPC braid Ø 1.30 mm (95% coverage).
• Outer jacket: FEP Ø 1.80 mm, light brown color.

Typical applications

• RF cabling in compact devices and miniaturized instruments.
• Equipment operating in high-temperature environments or with strict thermal requirements.
• High-density electronic systems where available space is a critical constraint.

Why choose RG178B/U

• Ultra-compact for installations in extremely confined spaces.
• PTFE for superior electrical stability and thermal resistance compared to PE cables.
• 50 Ohm standard for compatibility with RF systems.
• MIL-C-17F compliance for technical and industrial applications.

FAQ – Frequently asked questions

Is RG178B/U suitable for long distances?
RG178B/U is primarily designed for minimal size and thermal resistance. For longer runs or lower attenuation requirements, cables with a larger diameter should be considered.

What is the outer diameter?
The outer jacket diameter is 1.80 mm.

Is it available from stock and sold by the meter?
The cable is sold by the meter and availability is shown on the product page. For large quantities, a dedicated quotation can be requested.