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SMA RF Connectors

SMA connectors, short for SubMiniature Version A, are semi-precision, subminiature devices that provide repeatable electrical performance from DC to 12.4 GHz with flexible cable. SMA Connectors find applications in Aerospace & Defense, Communications, Industrial and Telecommunications fields.

SMA Connector Specifications

SMA connectors feature screw-type coupling. Semi-Rigid cabling extends the frequency range of the device to 18GHz. SMA connectors offer broadband performance with low reflections and constant 50 ohm impedance. These properties, along with minimum attenuation and low VSWR have made the SMA connector extremely popular in the microwave community. LTI SMA connectors are designed to conform to MIL-C-39012 specifications.

SMA Plug Connector

SMA Jack Connector

SMA connector specifications SMA connector specifications
Letter Minimum Maximum
A 6.35 6.73
B 4.53 4.59
C 0.90 0.94
D 0.00 0.38
E 2.54 3.43
F 0.00 0.25
G 0.00 0.25
H 1.91 2.54
I 1.24 1.30
- - -
Letter Minimum Maximum
A 5.28 5.49
B 4.60 4.67
C 5.54 -
D 4.32 -
E 0.38 1.14
F 0.00 0.25
G 0.00 0.25
H 2.92 -
I 1.88 1.98
J 1.24 1.30

SMA Electrical Ratings

Impedance 50 ohm  
RF Leakage -90 dB @ 2-3 GHz  
Insulation Resistance 5000 Mmin  
Contact Resistance Center Contact Outer Contact
  3.0 m max 2.0 m max
  Straight Connectors Right Angle Connectors
Insertion Loss .04 dB max x w f GHz .06 dB max x w f GHz
Cable Type Semi-Rigid Flexible Semi-Rigid Flexible
Frequency DC to 18 GHz DC to 12.4 GHz DC to 18 GHz DC to 12.4 GHz
Cable Dielectric Diameter (mm) 0.94 1.68 3 0.86 1.5 2.95 0.94 1.68 3 0.86 1.5 2.95
Dielectric Withstanding Voltage (at sea level, in V rms,50Hz) 1000 1000 1500 500 750 1000 1000 1000 1500 500 750 1000
Working Voltage (at sea level, in V rms,50Hz) 250 335 500 250 250 335 250 335 500 250 250 335
Corona Extinction Voltage (at 21000m, in V rms,50Hz) 250 250 375 190 190 250 250 250 375 190 190 250

SMA Mechanical Ratings

Mating 1/4"-36 threaded coupling  
  Brass Stainless Steel
Durability 100 matings max 500 matings max
Coupling Proof Torque 5.3 in-lbs 15 in-lbs
Coupling Nut Retention Force 60.7 lbs min 60.7 lbs min
Contact Captivation - Axial 6.1 lbs min 6.1 lbs min
Cable Retention RG 174, 188, 316 RG 178, 196
12.1 lbs min 7.3 lbs min

SMA Environmental Ratings

Temperature Range -65C to +165C  
Thermal Shock MIL-STD-202, Method 1017, Condition A  
Vibration MIL-STD-202, Method 204, Condition D  
Corrosion MIL-STD-202, Method 101, Condition B  
Temperature Cycling MIL-STD-202, Method 102, Condition C  

Materials

    Material Plating
Connector Body   Brass per QQ-B-626 Gold/Nickel
Center Contact Male Brass per QQ-B-626 Gold
  Female Beryllium Copper per QQ-C-530 Gold
Insulator   Teflon None
Gasket   Silicone Rubber None
Crimp Ferrule   Annealed Copper per WW-T-799 Same as body