SMA connectors are a type of coaxial connector that was developed in the 1960s for use in high-frequency microwave and millimeter-wave applications. They are named for their screw-type mating mechanism, which allows for a secure connection between two SMA connectors. SMA connectors are commonly used in a wide range of applications, including telecommunications, networking, military and aerospace, medical equipment, and more.
The interface and standard
If a connector compliant with IEC60169-15 ,MIL-C-39012 ,MIL-STD-348 standards and interface conform to below drawing, we can call it SMA connectors.
Depend on the cable, working frequency, connector appearance
Rating Voltage
335 VAC
Insulation Resistance
5000 MΩ Min
Center Contact Resistance
3.0 mΩ Max
Outer Contact Resistance
2.0 mΩ Max
RF Leakage
-60 dB Max (DC - 3 GHz)
Insertion Loss
.06 √(f(GHz)) dB Max
Power Handling
75 W @ 10 GHz @ 25ºC
Mechanical Performance
Mating Cycles
500 Min
Coupling Mechanism
Threaded
Interface Specification
MIL-STD-348
Mating Torque (Stainless Steel Plug)
0.8-1.1 N-m / (7-10 in-lbs)
Mating Torque (Brass Plug)
0.3-0.6 N-m / (3-5 in-lbs)
Environmental Performance
Typical Temperature Range
-65°C to +165°C
Styrene Insulator/Phosphor Bronze Contact
-40°C to +85°C
Advantage of SMA connectors
SMA connectors have a screw-type coupling mechanism, which allows for a secure connection between two SMA connectors. They are typically mated using a clockwise motion and can be easily tightened or loosened by hand and torque wrench. By screw coupling, the SMA connectors have anti-vibration function and can work in harsh environment.
One of the key features of SMA connectors is their small size with light weight, which makes them well-suited for use in a variety of applications where space is at a premium. They are typically much smaller than other types of RF connectors, such as N-type connectors or BNC connectors.
SMA connectors are designed to operate at frequencies up to 18 GHz, although some versions are rated for use up to 26.5 GHz or even higher. SMA connectors have a low level of return loss, which makes them well-suited for use in high-frequency applications where signal integrity is important.
Additionally, SMA connectors could assembly with most of popular flexible cable, such as RG series cables , LMR series cables, semi-rigid cables and phase stable cables.
Types of SMA
There are several different types of SMA connectors, including male and female connectors, as well as straight ,right-angle, flange mount, bulkhead mount, connectors. SMA connectors are also available in a variety of different lengths and configurations to suit different applications.
SMA connectors are also available in RP- male and RP-female versions. The RP(reverse polarization) connector commonly used for antenna application to secure the connection.
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