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.

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Applications

  • Automotive
  • Cable Assemblies
  • PC/Lan
  • Surge Protection
  • Video Systems
  • Switching Equipment
  • GPS
  • Components
  • Process Controls
  • Telecom
  • Networking
  • Base Stations
  • Instrumentation
  • Radio Boards
  • Test and Measurement

 

 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
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
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.