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

SMB Series RF Coaxial Connector

The SMB series is a small push-on RF coaxial connector offering compact design, convenient connection and reliable contact. Operating at 50 Ω from DC to 4 GHz, it uses gold-plated phosphor-bronze pins and beryllium-copper sockets in brass or stainless-steel bodies with PTFE insulation. Snap-on coupling makes it well suited to dense panels and test equipment where fast mating matters more than high torque retention.

Key Specifications

Impedance 50 Ohm

Frequency DC - 4 GHz

Coupling Push-On

Executive Standard	GJB681A (MIL-C-39012)
Impedance	50 Ω
Frequency Range	DC–4 GHz
Coupling	Push-on (snap-on)
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
Contact Resistance	Inner ≤ 6.0 mΩ; outer ≤ 1.0 mΩ
Insulation Resistance	≥ 1000 MΩ
Dielectric Withstanding Voltage	750 V
VSWR	≤ 1.3
Mechanical Endurance	500 mating cycles