SMB Series

SMB subminiature coaxial connectors are based on MIL-C-39012. They are designed for 50 Ohm systems with a working frequency up to 4 GHz.
The snap-on mating design can offer not only a low mating force, but also a fast and reliable connection.
The major application of SMB series connectors are microwave, phone and other telecommunication devices.

Plug interface

Jack interface

Click to see dimensions

Click to see dimensions

Material
Body Brass, gold or nickel plated
Center contact Brass (male)/BeCu (female), gold plated
Insulator Teflon
Crimp ferrule Annealed copper, gold or nickel plated
Electrical
Impedance 50 Ohm
Frequency range 0 ~ 4 GHz
Working voltage RG178,196 = 250V rms @sea level max
RG174, 188, 316 = 335V rms @sea level max
Insulation resistance 1000 MOhm min
Dielectric withstanding voltage RG178, 196 = 750V rms min
RG174, 188, 316 = 1000V rms min
Contact resistance Center contact: 6.0 mOhm max
Outer contact: 1.0 mOhm max
VSWR Straight connector:
RG178,196 = 1.30 + 0.04F (F in GHz)
RG174, 188, 316 = 1.25 + 0.04F (F in GHz)

Right angle connector:
RG178, 196 = 1.45 + 0.06F (F in GHz)
RG174, 188, 316 = 1.35 + 0.04F (F in GHz)

Insertion loss Straight connector = 0.30dB max @1.5GHz
Right angle connector = 0.6dB max @1.5GHz
Mechanical
Engagement force 14.0 lbs max
Disengagement force 2.0 ~ 14.0 lbs
Connector durability 500 matings
Cable retention force RG178 = 7.3 lbs min, RG316 = 12.1 lbs min, RG58 = 28.7 lbs min
Environmental
Corrosion (Sail spray) MIL-SID-202F, Method 101D, Condition B
Thermal shock MIL-STD-202F, Method 1017G, Condition A
Vibration MIL-STD-202F, Method 204D, Condition B
Mechanical shock MIL-STD-202F, Method 213B, Condition A

Alpha Center
351 Irving Drive, Oxnard, CA 93030, USA
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