DDC / North Hills DB80091 Box Type, Multi-Stub Data Bus Coupler

The DDC / North Hills DB80091 is a box-type, multi-stub data bus coupler that connects up to 8 transformer-coupled stub ports to MIL-STD-1553B networks. Engineered for aerospace and defense systems, this coupler delivers reliable signal distribution with minimal signal degradation while maintaining high common mode rejection and environmental protection.

## Technical Specifications

• **Stub Ports:** Up to 8 transformer-coupled ports
• **Common Mode Rejection:** >45 dB at 1 MHz; specified at 55 dB
• **Turns Ratio:** 1:1.41
• **Stub Voltage Range:** 1.0 VPP to 14.0 VPP
• **Nominal Bus Impedance:** 78Ω
• **Fault Protection Resistors:** 59Ω ± 1%, 1 Watt per MIL-R-39007
• **Droop:** 20% Maximum at 250 kHz
• **Overshoot/Ringing:** +1.0V Peak (250 kHz square wave, 100 ns rise/fall time)
• **Operating Temperature:** −55°C to +125°C
• **Storage Temperature:** −55°C to +150°C
• **Case Material:** 0.031″ cold rolled steel with hot tin dip finish and MIL-E-15090 light blue enamel
• **Base Plate:** 0.043″ cold rolled steel
• **Compliance:** MIL-STD-1553B and Notice 2

## Key Features

• Solder-sealed construction for superior environmental, EMI, and corrosion protection
• Transformer coupling isolates and balances stub signals
• High common mode rejection minimizes noise and interference
• Fault-tolerant design with per-port current-limiting resistors
• Standard connectors (Trompeter PL-75-47 types commonly used)
• Compact box enclosure simplifies installation in constrained airborne environments

## Typical Applications

• Airborne avionics systems
• Defense platform communications networks
• Test and development benches for MIL-STD-1553 validation
• Multi-stub data bus distribution in distributed architecture designs

## Compatibility & Integration

Designed for MIL-STD-1553 networks. The 1:1.41 turns ratio provides impedance matching for 78Ω bus lines. Full mechanical drawings and environmental qualification reports, including gunfire vibration analysis, are available upon request. NSN: 7025-01-548-1896.