SMB RF connectors are semi-precision, subminiature devices that provide repeatable electrical performance from DC to 4 GHz. The SMB family of connectors provides a means of quick connect and disconnect through a snap-on type coupling. This makes them useful in areas that are inaccessible to normal mating action. They are best suited for use with cables in the range of .070" to .120" diameters, such as RG 178, RG 174, RG 316. The series is similar in size to SMC connectors but is generally used at a lower frequency. LTI SMB type connectors are designed to conform to MIL-C-39012 specifications.
Its smaller physical size and snap-on coupling make the SMB an ideal general purpose connector where packaging density, ease of mating/unmating and economy are prerequisites. Typical applications for SMB connectors are telecommunications, test equipment, instrumentation, and GPS.
SMB Plug |
SMB Jack |
 |
 |
|
Letter |
Minimum |
Maximum |
|
A |
2.00 |
2.06 |
|
B |
0.18 |
0.94 |
|
C |
0.18 |
- |
|
D |
- |
1.62 |
|
E |
2.97 |
- |
| F |
3.58 |
- |
| G |
3.58 |
- |
| - |
- |
- |
| - |
- |
- |
| - |
- |
- |
| - |
- |
- |
| - |
- |
- |
|
| Letter |
Minimum |
Maximum |
| A |
3.66 |
3.71 |
| B |
2.08 |
2.16 |
| C |
0.48 |
0.53 |
| D |
- |
0.25 |
| E |
3.33 |
3.58 |
| F |
2.03 |
- |
| G |
0.00 |
- |
| H |
0.69 |
0.94 |
| I |
- |
0.18 |
| J |
- |
0.18 |
| K |
1.32 |
- |
| L |
- |
2.97 |
|
| 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 |
| Mating |
Snap-on Coupling |
|
| Durability |
500 matings max |
|
| Coupling Nut Retention Force |
36 lbs min |
|
| Contact Captivation |
4 lbs min |
|
| Cable Retention |
RG 174,188,316 |
RG 178,196 |
| 20 lbs min |
6 lbs min |
|
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-1344, Method 1003, Condition A
|
|
|
|
|
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
|
