Digitrax 20022 SDH166D Standard 1 Amp Sound Decoder, HO Scale

DigitraxSKU: DTX00020022


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SDH166D fits many HO locomotives.

Comes with selectable Steam & Diesel sounds so you can use it in any type of

  • 1.0 Amp/ 2.0 Amps Peak Current Rating
  • 6 FX3Functions-200mA
    total current
  • FX3Outputs are
    optimized for both LED & bulbs
  • Configurable FX3pulse
    on all function leads
  • Series 6 features
  • 3 Simultaneous Voices
  • Customizable 8 bit sound projects

  • Use PR3 and SoundLoader 2.0

  • 4 Megabit on board sound memory
  • 8 Ohm 16 x 26 x 9mm box speaker included
  • 1 Watt sound output
  • 330uF Capacitor for sound hold up included
  • Cam input synchronized steam chuff
  • Works with PX112-10 Power Xtender
  • Decoder Body Size 1.28 x 0.67 x 0.25

SDH166D replaces SDH164D.

Digitrax SoundFXSound
Your locomotives will sound in scale like the real thing with SoundFX

  • Customizable 8 Bit Sound
  • Works with SoundFX 8 Bit sound files
  • 3 Simultaneous Voices
  • Downloadable Sound with Digitrax PR3 and SoundLoader 2.0 software
  • 4 Megabit Onboard Sound Memory
  • 1 Watt Sound Output
  • Cam input-synchronized Steam-chuff option for Steam locos
  • Scaleable Speed Stabilization(BEMF) optimized for sound operationSoundFX
    does not require an external rate sensor to vary workload.
  • Factory 8 Ohm 16 x 26 x 9 mm box speaker on 10 Pin Plug design makes
    installation quick and easy.

Easy Programming and Installation

  • Smart Power Management-no more booster or programmer shutdowns!
  • Program CVs using any Digitrax Compatible Control system without having to
    buy any extra equipment.
  • Digitrax Easy Connect 9 Pin Plug for Track, Motor and Function Control.
  • Direct mode programming.
  • Decoder Reset CV with or without speed table reset.

Series 6 Decoder Features

  • Works with PX112-10 Power Extender for improved operation in the presence
    of intermittent track power.
  • Digitrax FX3Functions-Control
    lights and functions for prototypical lighting effects and on/off control.
  • Configurable FX3Pulse
    Function available on all function outputs.
  • Improved Scaleable Speed Stabilization (BEMF)

Lets your trains run like the real thing!

  • 2 Digit and 4 Digit Addressing.
  • Basic, Advanced & UniVersal Consisting.
  • SuperSonic motor drive for silent operation.
  • Transponder Equipped ready for transponding on your Layout.
  • Motor Isolation Protection helps prevent damage to your decoder.
  • DCC Compatible.
  • FCC Part 15, Class B RFI compliant.


Current Rating-Motor

1.0 Amps/2.0 Amps Max


1.28 x 0.67 x 0.25 (32.5mm x 17.02mm x 6.35mm)



Function Outputs


Function Type



Series 6

For Use With

PX112-10 Power Xtender

Current Rating-Functions

200 mA

Original Release Date



8 Ohm 16 x 26 x 9mm box speaker


330uF for sound hold up

Simultaneous Voices


Onboard Sound Memory

4 megabit

Sound Projects Supported

8 bit sound projects



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