SMB Series



Table of contents

  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



Brass, gold or nickel plated

Center contact

Brass (male)/BeCu (female), gold plated



Crimp ferrule

Annealed copper, gold or nickel plated



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


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


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


Corrosion (Sail spray)

MIL-SID-202F, Method 101D, Condition B

Thermal shock

MIL-STD-202F, Method 1017G, Condition A


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

2020 Alpha Products, Inc. All rights reserved.