SMB
SMB

The SMB connector name derives from SubMiniature B (the second subminiature design). Developed in the 1960's, the SMB connector is a smaller version of the SMA connector with snap-on coupling. SMB connectors conform to the requirements of MIL-PRF-39012, and the interface is in compliance with MIL-STD-348. Available in 50 Ohms impedance, the SMB connector provides broadband capability through 4 GHz with a snap-on connector design.

 

 

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Features & Benefits
  • Broadband performance with low reflection DC to 4 GHz provides low cost connector combined with high quality
  • Quick connect/disconnect snap-on mating reduces installation time
  • Various plating options in nickel, gold, and tin lead. Selective plating provides corrosion resistance finish as well as good solderability characteristics
  • SMB PCB slide-on plug and jack allows board-to-board mounting with a low insertion force. This is ideal for mating a high number of connectors on a pair of PCB's.

 

Applications
  • Cable Assembly
  • Components
  • Computer Networks/LAN
  • Process Controls
  • Automotive
  • Surge Protection
  • Video Systems
  • GPS Navigation System
  • Telecom
  • Base Stations
  • Instrumentation
  • Radio Boards
  • Test and Measurement

 

Technical Specifications

50 Ohms SMB Connector Specifications


Electrical

Frequency Range

0-4 GHz with low reflection; usable to 10.0 GHz

Nominal Impedance

50 Ohms

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

Outer contact

Braid to body

 

6.0 milliohms initial, 8.0 after environmental;
1.0 milliohms initial, 1.5 after environmental
1.0 milliohms initial, after environmental N/A

Insulation Resistance

1,000 Megohms 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 maximm.
Disengagement: 2 lbs maximum
After 500 matings, 14 lbs maximum engagement and disengagement

Connector Durability

500 mating cycles minimum


 

Materials

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