Modular (RJ) to DB9 Adapter

Modular (RJ) to DB9 Adapters

Modular (RJ) to DB9 Adapter - Modular Adapter, DB9 Female to RJ11/RJ12 6P6C
Part No. Description Price Stock
MJD9F6P6C Modular Adapter, DB9 Female to RJ11/RJ12 6P6C $1
MJD9F8P8C Modular Adapter, DB9 Female to RJ45 8P8C $1
MJD9M6P6C Modular Adapter, DB9 Male to RJ11/RJ12 6P6C $1
MJD9M8P8C Modular Adapter, DB9 Male to RJ45 8P8C $1
∗ Standard lead time is 1 week

General Description

Use these handy adapters to easily customize interconnections between DB9 and module connectors. This is often useful in serial communicationsequipment when transitioning between connector styles.

Each adapter kit comes with the RJ connector preinstalled and wired with DB9 pins crimped onto the ends of the pigtails (as pictured above). Simplysnap the pins into the DB9 housing to achieve the desired wiring connections between the DB and RJ connectors. Then snap the DB9 connector into the plastic adapter housing, and the adpater is ready to install and use. No soldering required!

These adpaters are available with DB9 Male, DB9 Female, 6P6C (RJ11/RJ12/RJ14), and 8P8C (RJ45) connectors and are available in the following combinations:

Model # DB Connector RJ Connector
MJD9F6P6C DB9 Female 6P6C (RJ11/RJ12/RJ14)
MJD9M6P6C DB9 Male 6P6C (RJ11/RJ12/RJ14)
MJD9F8P8C DB9 Female 8P8C (RJ45)
MJD9M8P8C DB9 Male 8P8C (RJ45)

Color Codes

The pigtail wires that come attached to the modular jack are color coded according to the modular jack pin number to which they are connected. This allows you to easily build the pin mapping that you want by inserting particular color wires into whatever DB9 pin slots you need, based on your application. The color codes for the two different modular jack styles are shown below.

6P6C (RJ11/RJ12/RJ14)

6P6C Jack Pin# Wire Color
1 Blue
2 Yellow
3 Green
4 Red
5 Black
6 White

8P8C (RJ45)

8P8C Jack Pin# Wire Color
1 Blue
2 Orange
3 Black
4 Red
5 Green
6 Yellow
7 Brown
8 White
(click image to enlarge)
MJD9M8P8C, Assembled
(click image to enlarge)


  • Available with DB9 Male or Female connector
  • Available with RJ11/RJ12 or RJ45 connector
  • Easily customize DB9 / RJ interconnections
  • Just snap the wires into the DB9 shell - no soldering!
  • Small footprint