SMB, Mini-SMB and SMZ Connector Series
SMB (50 Ohm)
The SMB name derives from SubMiniature B (the second subminiature design). Developed in the 1960's, the SMB is a smaller version of the SMA with snap-on coupling. Amphenol's SMB connectors conform to the requirements of MIL-C-39012, and the interface is in compliance with MIL-STD-348. Available in 50 Ω and 75 Ω impedance, the SMB provides broadband capability through 4 GHz with a snap-on connector design and utilizes die cast components on non-critical areas to provide a low-cost solution.
Mini-SMB (75 ohm)
Amphenol Connex' Mini 75 Ω SMB connector family. Mini 75 Ω SMB provides broadband capability through 2 GHz. Its snap-on design utilizes die cast components on non-critical areas to provide a low cost solution
The Mini 75 Ω SMB offers snapfit mating for quick connect/disconnect. The reduced housing allows circuit miniaturization and efficient"real estate" utilization. Built in accordance with requirements of Mil-C-39012, the interface is in compliance with Mil-STD 348 and is interchangeable with Industry Standard for Miniature 75 Ω SMB
SMZ (75 Ohm)
The SMZ connector features the 75 ohm impedance of the Mini-SMB connector brought up to the size of the standard 50 ohm SMB.
Product Links
- SMB Catalog Section (PDF)
- Connector Products: SMB | Mini-SMB | SMZ
- Cable Assemblies: SMB | Mini-SMB
- View SMB Adapters: SMB | Mini-SMB
Applications
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SMB 50 Ω Specifications
Electrical |
|
| Impedance | 50 Ω |
| Frequency Range | 0-4 GHz with low reflection; usable to 10.0 GHz |
| Voltage Rating for RG-188/U Cable | 335 volts at sea level and 85 volts at 70,000 feet |
| Dielectric Withstanding Voltage | RG-196: 750 VRMS; RG-188: 1,000 VRMS |
| VSWR | Straight connector, RG-196/U: 1.30 + .04 f (GHz) Right angle connector, RG-196/U: 1.45 + .06 f (GHz) Straight connector, RG-188/U: 1.25 + .04 f (GHz) Right angle connector, RG-188/U: 1.35 + .04 f (GHz) |
| Contact Resistance | Center contact: 6.0 mΩ initial, 8.0 after environmental; Outer contact: 1.0 mΩ initial, 1.5 after environmental Braid to body: 1.0 mΩ initial, after environmental N/A |
| Insulation Resistance | 1,000 MΩ minimum |
| Insertion Loss | Straight connector: 0.30 dB @ 1.5 GHz Right angle connector: 0.60 dB @ 1.5 GHz |
| RF Leakage | -55 dB minimum @ 2-3 GHz |
Mechanical |
|
| Mating | Snap-on coupling per MIL-STD-348 |
| Braid/Jacket Cable Affixment | Hex crimp |
| Center Conductor Cable Affixment | Solder |
| Contact Captivation | All types unless noted otherwise |
| Cable Retention | Equal to breaking strength of cable employed |
| Engagement Forces | Engagement: 14 lbs maximum Disengagement: 2 lbs minimum After 500 matings, 14 lbs maximum engagement and disengagement |
| Connector Durability | 500 mating cycles minimum |
Material |
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| Center Contact | Female: beryllium copper, gold-plated Male: brass or beryllium copper, gold-plated |
| Outer Contact Plating | Nickel or gold plating as indicated |
| Body | Brass per QQB-626, or zinc per ASTM B86-71 |
| Body Plating | Nickel or gold plating as indicated |
| Insulator | TFE |
| Crimp Ferrule | Annealed copper alloy |
Environmental |
|
| Temperature Range | - 65°C to +165°C |
| Thermal Shock | MIL-STD-202 method 107, test condition B (except high temperatures @ 200°C |
| Shock | MIL-STD-202 method 202, method 13, snap-on, test condition B; 75 G's @ 6 milliseconds ½ sine |
| Vibration | MIL-STD-202 method 204, snap-on, test condition B; (15 G's) |
| Corrosion | MIL-STD-202 method 101, test condition B. 5% salt solution |
Note: These characteristics are typical but may not apply to all connectors.
Mini-SMB (75 Ω) Specifications
Electrical |
|
| Impedance | 75 Ω |
| Frequency Range | 0-2 GHz with low reflection |
| Voltage rating for RG-188/U cables | Sea level: 335 volts 70,000 ft: 85 volts |
| Dielectric Withstanding voltage | 750 VRMS for RG-179 type |
| VSWR RG-179/U Series cables |
Straight connectors 1.33 max. Rt. angle connectors 1.43 max. |
| Contact Resistance Center contact Outer contact |
Initial 6.0 mΩ After environmental, 8.0 After environmental, 1.5 initial, 1.0 mΩ |
| Braid to body | After environmental N/A |
| Insulation Resistance | 1000 MΩ minimum |
| RF leakage | -55 dB minimum @ 2GHz |
| Insertion Loss | Straight connectors 0.30 dB @ 1.5 GHz Rt. angle connectors 0.60 dB @ 1.5 GHz |
Mechanical |
|
| Mating | Mini 75 ohm snap on coupling |
| Engagement forces | Initial 14 lbs. max. engagement. After 500 mating, 14 lbs. max engagement and disengagement. 2 lbs. min. disengagement. |
| Connector affixment to cable | Braid and jacket; hex crimp. |
| Cable affixment to center contact | Solder |
| Cable retention | Equal to breaking strength of cable employed |
| Connector durability | 500 mating and unmating cycles min. |
Material |
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| Bodies | Brass per QQB-626 or zinc per ASTM B86-71 as specified, nickel (or gold) plated as listed |
| Center Contact | Male: Brass, nickel plate |
| Insulators | TFE |
| Crimp ferrules | Annealed copper alloy |
Environmental |
|
| Temperature range | -65° C to +165° C |
| Thermal Shock | MIL-STD 202, Method 107 (test cond. B) except high temperature test @ +200°C |
| Vibration | MIL-STD 202, Method 204, snap-on (test cond. B)(15 G's) |
| Shock | MIL-STD 202, Method 213, snap-on (test cond. B) 75 G's @ 6 milliseconds 1/2 sine |
| Corrosion | MIL-STD 202, Method 101, (test cond. B 5% salt solution. |
Note: These characteristics are typical but may not apply to all connectors.
SMZ 75 Ω Specifications
Electrical |
|
| Impedance | 75 Ω |
| Frequency Range | 0-4 GHz with low reflection; usable to 10.0 GHz |
| Voltage Rating for RG-188/U Cable | 335 volts at sea level and 85 volts at 70,000 feet |
| Dielectric Withstanding Voltage | 1,000 VRMS |
| RF High Potential Withstanding Voltage | RF-195/U series: 500 VRMS |
| Corona Level | RG-195/U series: 400 volts minimum @ 70,000 ft |
| VSWR | Straight connector, RG-196/U: 1.30 + .04 f (GHz) Right angle connector, RG-196/U: 1.45 + .06 f (GHz) Straight connector, RG-188/U: 1.25 + .04 f (GHz) Right angle connector, RG-188/U: 1.35 + .04 f (GHz) |
| Contact Resistance | Center contact: 6.0 mΩ initial, 8.0 after environmental; Outer contact: 1.0 mΩ initial, 1.5 after environmental Braid to body: 1.0 mΩ initial, after environmental N/A |
| Insulation Resistance | 1,000 MΩ minimum |
| Insertion Loss |
Straight connector: 0.30 dB @ 1.5 GHz Right angle connector: 0.60 dB @ 1.5 GHz |
| RF Leakage | -55 dB minimum @ 2-3 GHz |
Mechanical |
|
| Mating | Snap-on coupling per MIL-STD-348 |
| Braid/Jacket Cable Affixment | Hex crimp |
| Center Conductor Cable Affixment | Solder |
| Contact Captivation | All types unless noted otherwise |
| Cable Retention | Equal to breaking strength of cable employed |
| Engagement Forces | Engagement: 14 lbs maximum Disengagement: 2 lbs minimum After 500 matings, 14 lbs maximum engagement and disengagement |
| Connector Durability | 500 mating cycles minimum |
Material |
|
| Center Contact | Female: beryllium copper, gold-plated Male: brass or beryllium copper, gold-plated |
| Outer Contact Plating | Nickel or gold plating as indicated |
| Body | Brass per QQB-626 |
| Body Plating | Nickel or gold plating as indicated |
| Insulator | TFE |
| Crimp Ferrule | Annealed copper alloy |
Environmental |
|
| Temperature Range | - 65°C to +165°C |
| Thermal Shock | MIL-STD-202 method 107, test condition B (except high temperatures @ 200°C |
| Shock | MIL-STD-202 method 213, snap-on, test condition B; 75 G's @ 6 milliseconds ½ sine |
| Vibration | MIL-STD-202 method 202, snap-on, test condition B; (15 G's) |
| Corrosion | MIL-STD-202 method 101, test condition B. 5% salt solution |
Note: These characteristics are typical but may not apply to all connectors.
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