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RJ45 8P8C Breakout/Buss Board. 4 RJ45/8P8C Jacks.

BRK8P8C4B - RJ45 4-Way Buss Breakout Board, Feet
Part No. Description Price Stock
BRK8P8C4B-S-FT RJ45 4-Way Buss Breakout Board, Feet $18 2
BRK8P8C4B-S-DIN RJ45 4-Way Buss Breakout Board, DIN Rail Mount $20 5

General Description

This RJ45 breakout board brings all 8 pins of an 8P8C / RJ45 modular jack out to screw terminal blocks, providing simple and convenient connection to each connector pin. Each pin is also brought to solder pads (3 per line) at 0.1" spacing, allowing the easy addition of standard pin headers. Please note that the breakout boards are manufactured with a connection between each connector pin and the corresponding screw terminal; no soldering of any type is necessary. The solder pads simply provide an area for making optional connections to headers or other components.

In addition, this board functions as a buss board, featuring four 8P8C jacks wired in parallel and connected to the solder pads and the screw terminals.This allows the user to easily break out a connection to screw terminals while at the same time connecting other cables to the same signals via the extra jacks. This is very convenient when "daisy-chaining" severaldevices together or when wiring multiple devices in parallel. Please see the photo below which depicts the bus connections. Note that all connections are wired 1-to-1 (ie Pin 1 to Pin 1, Pin 2 to Pin 2, etc.).

BRK8P8C4B Connection Diagram
(click image to enlarge)

This break out board is perfect for production wiring, for experimentation and prototype work,and for use in the educational laboratory. It is well-suited for work with RS-232 serial ports, sensors, data acquisition equipment, and any other device that uses an RJ45/8P8C connector. A breakout board is sometimes referred to as a "transition module", "terminal board", or "interface module".

For mounting on a panel, we suggest the rubber feet version (-FT), 1/4" nylon standoffs under the mounting holes, and #6 screws.

Connector Style

These breakout boards are available with a Straight ("Vertical") connector. This term refers to the connector itself, denoting that it rises straight out of the circuit board rather than at a right angle.The cable mating to a Straight connector is perpendicular to the PCB, as one can infer from the product photos.

DIN Rail Mount Version

These products are also available with pre-installed DIN rail mounting clips for quick and convenient mounting where DIN rail is used. Product numbers ending with -DIN come with DIN clips already installed and ready to mount. The clips allow mounting on standard 35mm rail as well as 32mm rail.
BRK8P8C4B-S-DIN pictured (rail not included)


  • Breakout board & buss board in a single package
  • Contains Qty 4 RJ45/8P8C Jacks wired in parallel
  • Screw terminal for each of the 8 signals
  • Useful for "daisy-chaining" connections
  • Screw terminals accomodate wire sizes from 16AWG to 26AWG
  • Solder connection holes, three (3) per line
  • Supports addition of .1" pin headers
  • Approximate dimensions: 2.50" x 2.40"
  • Rubber feet or DIN rail mount