SMA Connector Series
SMA is an acronym for SubMiniature version A and was developed in the 1960's. It uses a threaded interface. 50 Ω SMA connectors are semi-precision, subminiature units that provide excellent electrical performance from DC to 18 GHz. These high-performance connectors are compact in size and mechanically have outstanding durability.
For phase array radar, test equipment, ILS landing systems and other instrumentation using phase matching techniques, these SMA connectors for semi-rigid coaxial cables (0.085, 0.141 and 0.250 options are available). Many SMA connectors are available for standard RG and Low Loss style cables. SMA connectors are commonly crimped to RG-316, RG-316 double braided cable and Loss-Loss cables (such as LMR-100, 195, 240 and LMR-400). Other cables can be used. See our coaxial cable guide for help. Built in accordance with MIL-C-39012 and CECC 22110/111, SMA connectors can be mated with all connectors that meet these spec mating diameters regardless of manufacturer. Stainless steel and low-cost brass SMA connectors are available. End launch SMA connectors are also available and offer excellent performance.
SMA is available both in Standard and Reverse Polarity. Reverse polarity is a keying system accomplished with a reverse interface, and ensures that reverse polarity interface connectors do not mate with standard interface connectors. Amphenol accomplishes this by inserting female contacts into plugs and male contacts into jacks. Other manufacturers may use reverse threading to accomplish reverse polarity keying. Reverse threaded SMA connectors are also available.
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Features & Benefits
- Broadband performance DC to 18 GHz with low reflection stainless steel construction and ¼-36 threaded coupling offers high performance in a compact design.
- Low cost Commercial Grade (Brass SMA) available in nickel or gold plating which provides approximately 30% cost reduction with 250 mating cycles.
- Available for .085" and .141" diameter semi-rigid cables and all the standard flexible cables including double shielded RG-316.
- Phase Adjustable SMA connectors provide ease of mechanical screw adjustments, compared to the delays and expense of laborious cable-trimming.
Applications
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Stainless Steel SMA Specifications
Electrical
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| Impedance | 50 Ω |
| Frequency Range | .141" & .085" semi-rigid cable: 0-18 GHz Flexible cables: 0-12.4 GHz |
| Voltage Rating | RG-55, 58, 141, 142, 223, 303: 500 volts peak RG-122, 174, 188, 316: 375 volts peak |
| Dielectric Withstanding Voltage | .141" & RG-58 Cables: 1,000 VRMS .085" & RG-316 Cables: 750 VRMS |
| VSWR | Straight connector, .141": 1.05 + .005 f (GHz) Straight connector, .RG-55: 1.15 + .011 f (GHz) Straight connector, RG-122: 1.15 + .02 f (GHz) Straight connector, RG-178: 1.20 + .025 f (GHz) Right angle connector, .141": 1.10 + .01 f (GHz) Right angle connector, .RG-55: 1.15 + .02 f (GHz) Right angle connector, RG-122: 1.15 + .03 f (GHz) Right angle connector, RG-178: 1.20 + .03 f (GHz) |
| Contact Resistance | Center contact: 2.0 mΩ Body: 2.0 mΩ Braid to body: 0.5 mΩ |
| Insulation Resistance | 5,000 MΩ minimum |
| Insertion Loss | dB maximum = .03v[f(GHz)] |
| RF Leakage | -60 dB minimum |
Mechanical
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| Mating | .250-36 threaded coupling |
| Mating Torque | Minimum: 2 inch pounds (22 N.cm) Recommended: 7-10 inch pounds (80-110 N.cm) Maximum: 15 inch pounds (170 N.cm) |
| Coupling Nut Retention | Axial force: 100 inch pounds min. (300 N.cm) Torque: 15 inch pounds. min. (76 N.cm) Jacks: N/A |
| Connector Affixment to Cable | Crimp and solder types |
| Cable Affixment to Center Contact | Solder, except as noted |
| Contact Captivation | All types unless noted otherwise |
| Cable Retention (Crimp) | RG-58, 303 and .141": 60 lbs. minimum RG-55, 142, & 223: 80 lbs. minimum |
| Connector Durability | 500 mating and unmating cycles @ 12 cycles per minute |
Material
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| Bodies, Coupling Nuts, Other Metal Parts (except as noted) | Non-magnetic stainless steel style per QQ-S-764, Type 303 |
| Contacts | Beryllium copper per QQ-C-530, heat treated per MIL-H-7199 |
| Center Contact Plating | .00005" minimum gold per MIL-G-45204, type 1, grade C. Gold over nickel unless otherwise requested. |
| Plating (Other Metal Parts) | Gold plated or passivated to meet the finish and corrosion requirements of MIL-C-39012 |
| Insulator | TFE fluorocarbon per ASTM D1457 |
| Gaskets | Silicone rubber, per MIL-R-5847 and ZZ-R-765 class IIB, grade 65-75. |
| Lock washers | Stainless steel, internal tooth supplied with all bulkhead mounted connectors |
| Crimp Ferrule | Seamless copper tubing alloy #122 (DHP), hard drawn to Rockwell 58-77 on 30-T scale per ASTM B75 |
Environmental
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| Temperature Range | - 65°C to +165°C |
| Thermal Shock | MIL-STD-202 method 107 (test condition B) except high temperatures @ + 200°C |
| Vibration | MIL-STD-202 method 204 (test condition D) |
| Shock | MIL-STD-202 method 213 (test condition I). No discontinuity permitted. |
| Corrosion | MIL-STD-202 method 101 (test condition B) 5% salt solution |
| Moisture Resistance | MIL-STD-202 method 106, except step 7b (vibration) omitted, and high humidity measurements do not apply |
| Weatherproofing | Crimp type: heat shrink tubing Solder type: silicone rubber gaskets |
| Altitude | MIL-STD-202 method 105 (test condition C), no corona at 70,000 feet. .141" & RG-55: 250 VRMS .085" & RG-122: 190 VRMS |
Military Specifications
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| MIL-C-39012 & MIL-C-83517 SMA Specification Sheets | As applicable |
Note: These characteristics are typical but may not apply to all connectors.
Brass SMA Specifications
Electrical
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| Impedance | 50 Ω |
| Frequency Range | .141" & .085" semi-rigid cable: 0-18 GHz Flexible cables: 0-12.4 GHz |
| Voltage Rating | RG-58, 141, 142: 500 volts peak RG-174, 188, 316: 375 volts peak |
| Dielectric Withstanding Voltage | .141" & RG-58 Cables: 1,000 VRMS .085" & RG-316 Cables: 750 VRMS |
| VSWR | Straight connector, .141": 1.05 + .005 f (GHz) Straight connector, .RG-174: 1.15 + .02 f (GHz) Straight connector, RG-58: 1.15 + .01 f (GHz) Straight connector, RG-178: 1.20 + .025 f (GHz) |
| Contact Resistance | Center contact: 2.0 mΩ Body: 2.0 mΩ Braid to body: 0.5 mΩ |
| Insulation Resistance | 5,000 MΩ |
| Insertion Loss | dB maximum = .06v[f(GHz)] Test frequency @ 6.0 GHZ |
| RF Leakage | -90 dB minimum @ 2.3 GHz |
Mechanical
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| Mating | .250-36 threaded coupling |
| Mating Torque | Minimum: 2 inch pounds (12 N.cm) Recommended: 7-10 inch pounds (80-110 N.cm) Maximum: 15 inch pounds (170 N.cm) |
| Connector Durability | 100 matings |
Material
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| Bodies, Coupling Nuts, Other Metal Parts (except as noted) | Brass per QQ-B-626 |
| Contacts | Male: Brass Female: Beryllium copper, heat treated |
| Center Contact Plating | .000030" minimum gold |
| Plating (Other Metal Parts) | Standard .000010" gold or nickel plated |
| Insulator | TFE fluorocarbon |
| Gaskets | Silicone rubber |
| Crimp Ferrule | Seamless copper tubing alloy |
Environmental
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| Temperature Range | - 65°C to +165°C |
| Thermal Shock | MIL-STD-202 method 107 (test condition B) except high temperatures @ + 200°C |
| Vibration | MIL-STD-202 method 204 (test condition D) |
| Shock | MIL-STD-202 method 213 (test condition I). No discontinuity permitted. |
| Corrosion | MIL-STD-202 method 101 (test condition B) 5% salt solution |
| Moisture Resistance | MIL-STD-202 method 106, except step 7b (vibration) omitted, and high humidity measurements do not apply |
| Weatherproofing | Crimp type: heat shrink tubing Solder type: silicone rubber gaskets |
| Altitude | MIL-STD-202 method 105 (test condition C), no corona at 70,000 feet. .141" & RG-55: 250 VRMS .085" & RG-122: 190 VRMS |
Military Specifications
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| MIL-C-39012 & MIL-C-83517 SMA Specification Sheets | As applicable |
Note: These characteristics are typical but may not apply to all connectors.
Phase Adjustable SMA Specifications
Electrical
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| Impedance | 50 Ω |
| Frequency Range | DC-18 GHz |
| Insertion Loss | dB maximum For adapter 901-508 = .1v[f(GHz)] For plug 901-509 = .08v[f(GHz)] |
| VSWR | See chart below. **** |
| Phase Angle Adjustment Range in Degrees | For adapter 901-508 and plug 901-509 = 0° to [10 x f(GHz)]° maximum |
| Phase Angle Change per Revolution of Adjustment Nut in Degrees | For adapter 901-508 and plug 901-509 = [0.636 x f(GHz)]° |
| Voltage Rating | 500 VRMS peak |
Mechanical
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| Mating | Mating face dimensions compatible with the mating requirements of MIL-C-39012/55 (Type SMA) |
| Connector Durability | 500 cycles of mating and unmating without deterioration |
Material
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| Center Contact | Beryllium copper, Gold plated |
| Connector Body | Brass or Beryllium Copper, Gold plated |
| Adjusting Nuts and Locking Nuts | Brass with ASTRO plate finish |
| Connector Coupling Nut | Stainless steel, passivated |
| Insulation | TFE |
Environmental
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| Shock | MIL-STD-202 method 213 (test condition I) |
| Vibration | MIL-STD-202 method 204 (test condition D) |
| Corrosion | MIL-STD-202 method 101 (test condition B) |
| Temperature Range | - 65°C to +165°C |
Military Specifications
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| MIL-C-39012 & MIL-C-83517 SMA Specification Sheets | As applicable |
Note: These characteristics are typical but may not apply to all connectors.
Reverse Polarity SMA Specifications
Electrical
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| Impedance | 50 Ω |
| Frequency Range | Semi rigid 0 - 18 GHz |
| Voltage Rating | 375 volts peak |
| Dielectric Withstanding Voltage | 1,000 volts rms |
| VSWR | Straight connectors on .141" S/R: 1.05 + .005 f (GHz) Straight connectors on RG-174: 1.20 + .025 f (GHz) |
| Insertion Loss | .03 v[f (GHz)] dB maximum |
| Insulation Resistance | 5,000 MΩ |
| RF Leakage | -60 dB minimum |
Mechanical
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| Mating | .250-36 threaded coupling |
| Cable Affixment | Crimp or solder types |
| Center Conductor | Solder |
| Cable Retention | 60 - 80 lbs depending on cable |
Material
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| Center Contact | Beryllium copper, gold-plated |
| Crimp Ferrule | Copper tubing |
| Other Metal Parts | Non-magnetic passivated stainless steel or brass, gold or silver-plated |
| Insulators | TFE |
| Gaskets | Silicone rubber |
Environmental
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| Temperature Range | -65°C to +165°C |
| Moisture Resistance | MIL-STD-202, method 106, test condition B |
| Corrosion | MIL-STD-202, method 101, test condition B |
| Vibration | MIL-STD-202, method 204, test condition B |
Note: These characteristics are typical but may not apply to all connectors.
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