Dual, 3 Stubs MIL-STD-1553 Coupler

Bus Coupler

Sital’s MIL-STD-1553 coupler is a dual, three-stub coupler. Each three-stub coupler includes an optional internal bus termination. The coupler is designed to provide 3 stubs with termination for bus A and another 3 stubs for B. Alternatively, the two 3-stub couplers may be combined to provide a single 6-stub coupler for one data bus. The coupler can be provided with optional mounting accessories to fit in a 3U or 6U PCI or cPCI/PXI chasses allowing for dense and optimized organization of rack-mounted and portable test systems. This option enables denser and optimized organization of rack mounted testers. All connections and termination are enabled via a standard D-Type 25 connector. When the termination is connected, an LED lights up during live messaging, reflecting bus activity and utilization.




Part Number Mounting Description RFQ RFI Tech Support
CPLR1553STL-06 Panel The base dual 3-stub coupler, ready for panel mount. Connect either the 4 screws or the D-Type connector screws RFQ RFI Tech Support
CPLR1553STL-06-PCI PC Back-Panel The base dual 3-stub coupler mounted to a standard PC back-panel for easy integration inside PC housing RFQ RFI Tech Support
CPLR1553STL-06-PXI cPCI Back-Panel The base dual 3-stub coupler mounted to a standard cPCI back-panel for easy integration inside 3U cPCI or PXI housing RFQ RFI Tech Support
CPLR1553STL-12-PNL-6U 6U Back-Panel 2X base dual 3-stub couplers mounted to a standard 6U back-panel for easy integration inside a 6U VME or VPX housing RFQ RFI Tech Support



  • Compact size: ideal for test equipment racks
  • Single D-type 25-pin plug connector
  • Lower system cost – saves wires & triax plugs
  • MIL-PRF 21038/27 Internal Transformers
  • Includes six transformer-coupled 1553 stub connections
  • Internal coupling transformers provide compliance to MIL-STD-1553
  • Can be configured as either two 3-stub couplers or one 6-stub coupler
  • Includes two internal 78-ohm termination resistors enabling multiple configurations
  • Optional unique PCI or cPCI/PXI rack assemblies fittings
  • Flexible mechanical support for other rack assembly fittings
  • Low profile & lightweight
  • Termination enabled by shortening two connector terminals
  • LED activity indication per terminated coupler to indicate bus activity
  • Epoxy casting and finish for lifetime support


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