SMC Connectors

SMC Connector Specifications

SMC RF connectors are semi-precision, subminiature devices that provide repeatable electrical performance from DC to 10 GHz. The SMC family of connectors fill subminiature requirements, while providing a semi-permanent connection with their screw on mating mechanism. They are best suited for use with cables in the range of .070" to .120" diameters, such as RG-178, RG-174, and RG-316. The series is similar in size to SMB connectors. LTI SMC type connectors are designed to conform to MIL-C-39012 specifications. Typical applications for SMC connectors are telecommunications, test equipment, instrumentation and GPS.

SMC Plug

SMC Jack

SMC connector specifications SMC connector specifications
Letter Minimum Maximum
A 2.79 -
B - 2.06
C 3.37 3.81
D 0.00 -
E 2.79 -
F - 3.10
G - 3.40
H - 3.40
I - 5.92
- - -
- - -
Letter Minimum Maximum
A 5.94 -
B 3.12 3.38
C - 2.13
D - 0.25
E 0.48 0.53
F 2.08 -
G - 3.71
H 0.00 0.30
I 0.61 -
J 3.40 3.66
K 3.40 -

SMC Electrical Ratings

Impedance 50 ohm  
Frequency Range DC to 4 GHz  
  RG-174,188,316 RG-178,196
Dielectric Withstanding Voltage (at sea level, in V rms, 50 Hz) 1000 750
Working Voltage (at sea level, in V rms, 50 Hz) 335 max 250 max
Insulation Resistance 1000 M min  
RF Leakage -55dB max @ 2.5 GHz  
Insertion Loss Straight Right Angle
  .3dB max @ 1.5 GHz .6dB max @ 1.5 GHz
Contact Resistance Center Contact Outer Contact
5 m max 1 m max

SMC 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

SMC 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 1003, Condition A  

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

SMC VSWR

Cable Type Frequency Range
1 GHz 3 GHz 4 GHz
RG 55,142,223,400 1.15 1.35 1.35 Typical VSWR for SMC straight connectors
RG 58 1.15 1.35 1.35
RG 174,188,316 1.15 1.35 1.35
RG 178,196 1.15 1.35 1.35
Semi Rigid .086" 1.15 1.15 1.35
RG 55,142,223,400 1.15 1.3 1.3 Typical VSWR for SMC right angle connectors
RG 58 1.15 1.3 1.3
RG 174,188,316 1.15 1.3 1.3
RG 178,196 1.15 1.3 1.3
Semi Rigid .086" 1.15 1.3 1.3
Semi Rigid .141" 1.15 1.3 1.3