SMA Series



Table of contents

  SMA connectors are based on MIL-C-39012 specifications and provide a constant 50 Ohm characteristic  impedance up to 12.4 GHz.
  The SMA product designs include a wide range of configurations and will consider each customer's special requirements.
  The major application of SMA series connectors are test & measurement, mobile communication & other devices.

Plug interface

Jack interface

Click for dimensions

Click for dimensions


Body, coupling nut

Brass, gold or nickel plated

Center contact

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



Crimp ferrule

Annealed copper, gold or nickel plated


Silicone rubber



50 Ohm

Frequency range

0 ~ 12.4 GHz

Working voltage

RG178 = 170V rms, RG58 = 335V rms, RG174,  188, 316 = 250V rms max @sea level

Insulator resistance

5000 MOhm min

Dielectric withstanding voltage

RG178 = 500V rms, RG58 = 1000V rms, RG174, 188, 316 = 750V rms min

Contact resistance

Center contact: 3.0 mOhm max
Outer contact: 2.0 mOhm max


Straight connector:
RG178 = 1.20 + 0.025F (F in GHz)
RG174, 188, 316 = 1.15 + 0.02F (F in GHz)
RG58 = 1.15 + 0.01F (F in GHz)

Right angled connector:
RG178 = 1.20 + 0.03F (F in GHz)
RG174, 188, 316 = 1.15 + 0.03F (F in GHz)
RG58 = 1.15 + 0.02F (F in GHz)

Insertion loss

Straight connector = 0.06 x (f) GHz. Test  frequency @6 GHz
Right angled connector = 0.15 x (f) GHz. Test frequency @6 GHz


Force to engage

The torque required to engage and disengage  shall not to exceed 2 in/lbs

Coupling nut retention force

60 lbs min (for plugs only)

Coupling proof torque

15 in/lbs min

Connector durability

500 matings

Cable retention force

RG178 = 7.3 lbs min, RG316 = 12.1 lbs min, RG  58 = 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.