Connector Interface Guide: A Detailed Explanation of SMA, SMP, SMPM, and SMPS Interfaces and Their Applicable Applications
A wide variety of connector interfaces are currently available on the market, including SMA, SMP, SMPM, and SMPS. Below, we will delve into the characteristics and application scenarios of SMA, SMP, SMPM, and SMPS connectors.
High School
SMA (Subminiature A) is an RF coaxial connector interface that typically supports operating frequencies up to 18 GHz; high-performance versions can operate up to 26.5 GHz. The SMA connector features a threaded coupling design, offering a compact footprint and outstanding mechanical durability. It complies with MIL-PRF-39012 and CECC 22110/111 standards and is interoperable with any connector of the specified mating diameter, regardless of manufacturer. As a general-purpose product, the SMA’s environmental sealing capabilities make it suitable for a wide range of RF applications.
The overall parameters of SMA are as follows:
Impedance (Ω) 50Ω
Frequency: 18 GHz (up to 26.5 GHz for some models)
Shielding effectiveness ≥ -90 dB
Dielectric withstand voltage: 1000 V RMS
500 insertion/extraction cycles
Plug-and-socket torque: 7–10 inch-pounds
Interchangeability and compatibility: 2.92 mm
Temperature range: -65°C to +165°C
Corrosion resistance complies with MIL-STD-202, Method 101, Condition B.
Vibration resistance: Complies with MIL-STD-202, Method 204, Condition D.
Shock resistance: Complies with MIL-STD-202, Method 213, Condition I.
Thermal shock performance complies with MIL-STD-202, Method 107, Condition B.
Moisture resistance meets MIL-STD-202, Method 106, excluding Step 7B.
Pressure range (altitude): Complies with MIL-STD-202, Method 105, Condition C, at 70,000 feet.
SMP
SMP (Subminiature Push-on) connector interfaces comply with DSCC 94007, 94008, and MIL-STD-348 standards. SMP connectors are designed to meet industry demands for smaller size, high frequency performance, and compact form factors. Offering both ease of use and robust functionality, they are commonly employed in high-frequency, space-constrained equipment. Furthermore, due to the absence of a sealing mechanism at the interface, SMP connectors—including SMPM and SMPS variants—are primarily suited for internal chassis applications.
Impedance (Ω): 50 Ω
Frequency: 40 GHz
Shielding effectiveness ≥ -80 dB
Withstand Voltage: 500 VRMS
Insertion/Removal Cycle Life: 1,000 cycles per side
Insertion/Removal Cycle Life: 500 cycles (both sides)
Insertion/Removal Cycle Life – 100 for Full-Bilateral
Insertion Force – 3 lbs per side
Insertion Force – 5 lbs on Both Sides
Insertion Force – Full Bilateral 7 lbs
Pull-out force – 0.5 pounds on one side
Pull-out force – 7 pounds on both sides
Pull-out force – 9 pounds, full bilateral
Axial offset: maximum 0.010 inches
Radial eccentricity: maximum 3°
Temperature range: -65°C to +165°C
Corrosion resistance complies with MIL-STD-202, Method 101, Condition B.
Vibration resistance: Complies with MIL-STD-202, Method 204, Condition D.
Shock resistance: Complies with MIL-STD-202, Method 213, Condition I.
Thermal shock performance complies with MIL-STD-202, Method 107, Condition B.
Moisture resistance meets MIL-STD-202, Method 106, excluding Step 7B.
Pressure range (altitude): Complies with MIL-STD-202, Method 105, Condition C, at 70,000 feet.
SMPM
The SMPM (Miniature Push-Pull) connector interface series is designed to increase the packing density and operating frequency range of SMP connectors, and is now widely used in high-density, high-performance applications.
Impedance (Ω): 50 Ω
Frequency: 65 GHz
Shielding effectiveness ≥ -80 dB
Withstand Voltage: 325 VRMS
Insertion/Removal Cycles – 500 per side
Number of insertions/extractions – Pin-type: 100
Insertion Force – Pin Type: 2.5 lbs
Insertion Force – Socket Type: 4.5 lbs
Pull-out force – Pin-type: 1.5 lbs
Pull-out force – Socket type: 6.5 lbs
Axial offset: maximum 0.010 inches
Radial eccentricity: maximum 3°
Temperature range: -65°C to +165°C
Corrosion resistance complies with MIL-STD-202, Method 101, Condition B.
Vibration resistance: Complies with MIL-STD-202, Method 204, Condition D.
Shock resistance: Complies with MIL-STD-202, Method 213, Condition I.
Thermal shock performance complies with MIL-STD-202, Method 107, Condition B.
Moisture resistance meets MIL-STD-202, Method 106, excluding Step 7B.
Pressure range (altitude): Complies with MIL-STD-202, Method 105, Condition C, at 70,000 feet.
Switch-mode power supply
The SMPS (Super-Miniature Push-In) connector series inherits the outstanding features of the SMP and SMPM series, while featuring a more compact package design that is particularly well suited for applications with extremely high density requirements.
Impedance (Ω): 50 Ω
Frequency (GHz): 65 GHz
Shielding effectiveness ≥ -80 dB
Withstand Voltage: 250 VRMS
Insertion/Removal Cycle Life – 500 cycles per side
Number of insertions/extractions – Pin-type: 100
Insertion Force – Pin Type: 1.2 lbs
Insertion Force – Socket Type: 2.5 lbs
Pull-out force – Pin-type: 1 pound
Pull-out force – 4.5 lbs for socket-type
Axial offset: maximum 0.010 inches
Radial eccentricity: maximum 3°
Temperature range: -65°C to +165°C
Corrosion resistance complies with MIL-STD-202, Method 101, Condition B.
Vibration resistance: Complies with MIL-STD-202, Method 204, Condition D.
Shock resistance: Complies with MIL-STD-202, Method 213, Condition I.
Thermal shock performance complies with MIL-STD-202, Method 107, Condition B.
Moisture resistance meets MIL-STD-202, Method 106, excluding Step 7B.
Pressure range (altitude): Complies with MIL-STD-202, Method 105, Condition C, at 70,000 feet.
(Source: electropages)
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