RF Coaxial Connectors | SMA (GJB681A / MIL-C-39012)

SMA Series RF Coaxial Connector

The SMA series is a 50 Ω threaded RF coaxial connector for high-frequency signal transmission. Depending on the cable, it operates from DC to 12.4 GHz with flexible cable and up to 18 GHz with semi-rigid or semi-flexible cable, with VSWR of 1.15 + 0.02f or better. Centre contacts are phosphor-bronze (pin) and beryllium-copper (socket) with gold plating, in brass or stainless-steel bodies. Built to GJB681A (MIL-C-39012) with 500 mating cycles.

Key Specifications

Impedance 50 Ohm

Frequency DC - 18 GHz

Standard GJB681A

Executive Standard	GJB681A (MIL-C-39012)
Impedance	50 Ω
Frequency Range	DC–12.4 GHz (flexible cable); DC–18 GHz (semi-rigid / semi-flexible)
Inner Contact	Pin: phosphor bronze, gold plated / Socket: beryllium copper, gold plated
Body Material	Brass, gold or nickel plated; stainless steel, passivated or gold plated
Insulator	PTFE
Gasket	Silicone rubber
Contact Resistance	Inner ≤ 3.0 mΩ; outer ≤ 2.0 mΩ
Insulation Resistance	≥ 5000 MΩ
Dielectric Withstanding Voltage	1000 V
VSWR	≤ 1.15 + 0.02f (flexible); ≤ 1.10 + 0.01f (semi-rigid / semi-flexible)
Mechanical Endurance	500 mating cycles