DDC / North Hills DB40010 Box Type, Multi-Stub Data Bus Coupler

The DDC / North Hills DB40010 is a box-type, multi-stub data bus coupler engineered for MIL-STD-1553B networks. This transformer-coupled device provides four stub ports with a 1:1.41 turn ratio, delivering stub voltages from 1.0 VPP to 14.0 VPP across the 75.0 kHz to 1.0 MHz frequency range. The coupler achieves greater than 45 dB common mode rejection at 1 MHz and maintains nominal bus line impedance of 78Ω.

## Technical Specifications

• **Compliance:** MIL-STD-1553B and Notice 2
• **Common Mode Rejection:** >45 dB at 1 MHz
• **Stub Configuration:** 4 transformer-coupled stub ports
• **Turn Ratio:** 1:1.41
• **Stub Voltage Range:** 1.0 VPP to 14.0 VPP
• **Frequency Range:** 75.0 kHz to 1.0 MHz
• **Nominal Bus Impedance (Z₀):** 78Ω
• **Droop:** 20% maximum at 250 kHz
• **Overshoot/Ringing:** +1.0 V peak at 250 kHz square wave (100 ns max rise/fall time)
• **Operating Temperature:** -55°C to +125°C
• **Storage Temperature:** -55°C to +150°C

## Key Features

• Hot-tinned cold rolled steel construction with solder-sealed enclosure for superior environmental, EMI, and corrosion protection
• External termination uses 59Ω ±1%, 1 Watt resistors per MIL-R-39007
• Compact box-type form factor: 4.875 in. length × 1.100 in. height × 1.500 in. width
• MIL-E-15090 light blue enamel finish on 0.031 in. CRS case and 0.043 in. CRS base plate

## Typical Applications

• Airborne MIL-STD-1553 network installations
• Test and development environments requiring multi-stub bus coupling

## Compatibility & Integration

Designed for MIL-STD-1553 distributed networks with standard industrial connectors.