SMA (SubMiniature version A) connectors are semi-precision coaxial RF connectors developed in the 1960s as a minimal connector interface for coaxial cable with a screw type coupling mechanism. The connector has a 50 Ω impedance. It is designed for use from DC to 18 GHz.
RP-SMA or RSMA (Reverse polarity SMA) is a variation of the SMA connector specification which reverses the gender of the interface, as shown in Figures 1 and 2. The term "reverse polarity" here refers only to the gender of the connector's contact pin, not in any way to the signal polarity. The female RP-SMA connector has the same external housing as a standard or conventional female SMA connector, which consists of an outer shell with the threads on the outside; however, the center receptacle is replaced by a male pin. Similarly, the RP-SMA male has threads on the inside like a conventional male, but has a center receptacle instead of the male pin in the middle.[7][8] Normal SMA connectors are incompatible with RP-SMA connectors
Electrical:
| Electrical Data | Detail |
| Impedance | 50 ohms |
| Frequency range | 0 to 12.4GHz |
| Working Voltage | - RG178=170Vrms at sea level max.
- RG58=335 Vrms at sea level max.
- RG174,316=250Vrms at sea level max.
|
| Dielectric withstanding voltage | - RG178=500 Volts rms min.
- RG174,316=750 Volts rms min.
- RG58=1000 Volts rms min.
- RG142, 400: 1000 Volts rms min.
|
| VSWR | - Straight connector :1.3 max @ 6 GHz
- R/A connector:1.5 max @ 6GHz
|
Mechanical:
| Mechanical Data | Detail |
|
| Force to engage | The torque required to engage and disengage shall not exceed 2 inch-lbs |
| Mating | 1/4-36 threaded coupling |
| Coupling nut retention force | 60 pounds min(for plug connectors only) |
| Coupling proof torque | 15 inch-pounds min. |
| Connector durablity | 500 matings |
| Cable retention force | - RG178=7.3 lbs min.
- RG174=9.7 lbs min.
- RG316=12.1 lbs min.
- RG58= 28.7 lbs min.
- RG142, 400: 57.7 lbs min.
|
