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DCC Electrical Interface Connectors

Last Updated 210327
 

Streamlined Backshop offers a wide variety of DCC decoders and installation components for sale.


These products are differentiated by many features.  One of the most critical features and criterion for decoder selection is the electrical interface.


The NMRA has developed a Recommend Practice document that is used by manufacturers to insure consistent application of the many decoder electrical interface connector types in use today.


There is no right or wrong connector, only the one that matches the locomotive installation or best meets the needs of your project.  




CLICK HERE to shop for DCC Decoders by Interface

NMRA Recommended Practice 9.1.1

DCC Electrical Interface & Wire Color Code
Document

 

DCC Electrical Interface Connectors

Here are examples of the most common types of connectors in use today.  
 
Hardwire

7, 9, 11 (depending on decoder type) single wires with free ends.

NEM651 - 6-pin

 
NEM652 - NMRA 8-pin
 
NEM652 - NMRA 8-pin
 
6-pin plug to NEM651 standard (i.e. "small interface").

NEM651 - 6-pin Direct

 
NEM652 - NMRA 8-pin
 
NEM652 - NMRA 8-pin
 
NEM651 - 6-pin

 
NEM652 - NMRA 8-pin
 
NEM652 - NMRA 8-pin
 

NEM651 - 6-pin

 
NEM652 - NMRA 8-pin
 
NEM652 - NMRA 8-pin
 
6-pin plug to NEM651 standard (i.e. "small interface") directly on decoder.
 
NEM652 - NMRA 8-pin
 
8 pin plug to NEM652 standard (i.e. "medium interface").
 
JST - 9-Pin
 
9-pin interface to JST standard based on 9-pin plug and socket connections directly on decoder.
 
NEM662 - Next18
 
18-pin interface to NEM 662 standard based on 18-pin plug and socket connections (one anti rotation pin as index) directly on decoder.
 
NEM660 - 21MTC
 
21-pin interface to MTC standard based on 22-pin plug and socket connections (one anti rotation pin as index) directly on decoder.
 
Please refer to the 21MTC Connector page for additional details about the application and use of this connector.
 
 
NEM658 - PluX - 8 / 12 / 16 / 22 Pin
 
"PluX" (16-pin pictured) interface to MTC standard based on 22-pin plug and socket connections directly on decoder.
 
 

ESU E24

ESU has introduced a new interface in 2021 with the release of the ESU 58923 LokSound 5 Nano NMRA DCC Sound Decoder - Hardwire.

Per Matt Herman of ESU, LLC, "It is a new connection called E24. It is lower profile and more narrow. The only decoder on the market with this plug anywhere is the LokSound Nano. We needed to go this direction to keep the height down, and the width down. PLUS... It allows more outputs through the plug. This was a limitation with the Next18." 

I will publish any interface and standards information here when it becomes available.

  
Additional Information
 

Additional information on many DCC connectors can be found on the European Union of Model Railroad and Railroad Fans MOROP website.

 

You can purchase a set today from my online store

 

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