Features: Series 2

Digitrax Decoder Series Numbers

Over the years as technology advanced, Digitrax has added more and more features to our mobile decoders.  Also, over time, the industry standards and uses of come CVs have changed.  Each of our decoder web pages includes a link to a specification sheet for that particular decoder so that you will know which CVs are used for which features in that particular model.

Digitrax uses series numbers to let customers know which feature set is part of a particular decoder.

The fifth character of each mobile + function decoder part number is the Digitrax series designator.  For sound + motor + function decoders we typically use the sixth character as the series designator.  There are variations in a few part numbers.

Series 6

Compatible with Digitrax PX series Power Xtenders to keep locos and sound running in the presence of dirty/poor track work.
FX3 outputs optimized for both LED and bulb applications.
FX3 outputs have configurable pulse available on all outputs.
Improved Scaleable Speed Stabilization (BEMF).

SoundFX Series 6 Features

Sound decoders available with either 8 bit standard or 16 bit premium sound.
Sound decoders configured for 8 Ohm speakers.
Allows for longer sound fragments.
Available in either standard 3 or premium 4 voice versions.
Auto CV configuration by sound projects
Scaleable Speed Stabilization (BEMF) optimized for sound operation.

Series 5

Sound Bug Compatible:  Series 5 Digitrax Decoders add the ability to add sound to regular mobile decoders with Sound Bug.  Some Series 5 decoders have sockets for simply plugging in the Sound Bug while others require soldering to wire the Sound Bug to the decoder.

Series 4

First generation SoundFX decoders

Most are mobile, sound and function decoders, some are sound and function only decoders.

Series 3

Series 3 decoders with 6 functions have FX3 function outputs

Torque compensation

SuperSonic motor drive for quiet operation (silent operation)

Support for all DCC programming methods as of the time of release

Operations mode read back capability for CV read back on the main line

Scaleable Speed Stabilization (Adjustable Back EMF)

One Step decoder Factory CV reset (CV08=8 or CV8=9 to preserve loadable speed tables)

Motor Isolation Protection


White or Golden Yellow LEDs on decoders that come equipped with LEDs

Series 3 decoders with less than 6 functions have a modified set of features

Series 3 Economy

Digitrax Decoders have all Series 3 features EXCEPT Scaleable Speed Stabilization (BEMF)

Series 2

FX function outputs

Scaleable Speed Stabilization (Back EMF)


Series 1

Digitrax decoders have standard or configurable strobe function outputs.