News | April 22, 2003

Amphenol Introduces Mini 75 Ohm 45 Degree SMB Connector for 735A Cable

Source: Amphenol Corporation

Amphenol introduces the new Mini 75 OHM 45 degree connector for Belden 735A. The Mini 75 OHM SMB provides broadband capability through 2 GHz. Its snap-on design utilizes the 45 degree design to help the packaging of high density printed circuit boards.

The Mini 75 OHM SMB offers snap-fit mating for quick connect/disconnect. The reduced housing allows circuit miniaturization and optimal real estate utilization. Built in accordance with requirements of MIL-C-39012, the interface is in compliance with MIL-STD-348 and is inter-matable with industry standard for Mini 75 OHM SMB.

Key Features & Benefits:

  • 75 ohm snap-on coupling for quick installation
  • Same size as 50 ohm design, allowing higher density as the cable is directed away from the PCB
  • Selectively plated to offer cost-reductive solution

Applications:

  • Telecommunications
  • Switching equipment
  • Networking

Specifications:

1. Electrical Requirements

    1.1. Impedance: 75 ohms
    1.2. Frequency Range: 0-2 GHz with low reflection
    1.3. Voltage Rating: 335 volts at sea level, 85 volts at 70,000 feet
    1.4. Dielectric Withstanding Voltage: 750 VRMS for RG 735A cable
    1.5. VSWR RG 735A Series Cable: 45 degree connector 1.43 maximum
    1.6. Insulation Resistance: 1,000 milli-ohm minimum
    1.7. RF Leakage: Minus 55 db minimum @ 2 GHz
    1.8. Insertion Loss: 45 degree 0.60 db @ 1.5 GHz
    1.9. Center Contact Resistance: Initial 6.0 milli-ohms, after environmental 8.0 milli-ohms

2. Mechanical Requirements

    2.1. Mating: Mini 75 ohm snap-on coupling
    2.2. Engagement Force: Initial engagement 14 lbs maximum. Engagement and disengagement after 500 matings is 14 lbs maximum. 2 lb minimum disengagement.
    2.3. Connector Affixment to Cable: Braid and jacket: Hex crimp
    2.4. Cable Affixment to Center Contact: Solder
    2.5. Contact Captivation: Yes
    2.6. Cable Retention to Body: Equal to breaking strength of cable
    2.7. Connector Durability: 500 mating cycles

3. Material Requirements

    3.1. Body: Brass per QQB-626, nickel plated
    3.2. Center Contact: Female, beryllium copper gold plated
    3.3. Outer Contact: Brass gold plated with BECU ring
    3.4. Crimp Ferrule: Annealed copper alloy
    3.5. Insulator: TFE

Amphenol RF is the world's largest manufacturer of coaxial connectors for use in radio frequency, microwave, and data transmission system applications.