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I need to replace a DC adapter for an old NAS that was lost to a power spike but I'm having a hard time identifying exactly the kind of connector.

This is the connector on the back of the NAS:

enter image description here

I have this universal adapter kit that I use temporarily:

DC adapter kit with multiple plugs

And after testing a few plugs I discovered this is the one I need:

enter image description here

The plug has the following specifications:

  • outer diameter: 5.5 mm
  • inner diameter: 3.0 mm
  • no pin inside the plug (the pin is in the NAS connector)

I don't want to keep using the kit and need to find a definitive replacement. However, I'm having a hard time finding one with these exact specs.

I would like to know:

  • Is this a standard size?
  • Is there an IEC-like code for it?

Any additional information is appreciated.

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    \$\begingroup\$ Are you sure that you have the right ID? 5.5mm OD with 2.5mm ID is a standard barrel plug size. I'd suggest you buy one of those and try it to see if it fits. \$\endgroup\$
    – user324996
    Dec 17, 2022 at 12:48
  • \$\begingroup\$ What's stopping you from looking at the connector on the original power supply, or using it with another power supply? \$\endgroup\$
    – Justme
    Dec 17, 2022 at 14:29
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    \$\begingroup\$ This is a standard barrel plug. They come in several sizes, though an ID of 3 mm is unusual. \$\endgroup\$
    – Hearth
    Dec 17, 2022 at 15:09
  • \$\begingroup\$ what are the dimensions of the original connector? \$\endgroup\$
    – jsotola
    Dec 17, 2022 at 18:59
  • \$\begingroup\$ @Justme the original connector melted due to the power supply failure but I'm sure it had these same specs because the plug from the kit fitted perfectly. \$\endgroup\$
    – Pedro Almeida
    Dec 17, 2022 at 22:50

1 Answer 1

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You can search for DC power connectors at Mouser and Digi-Key and others and do a parametric search (or set a filter) on inner/outer size, gender, etc. to find the right size and type. Note that different lengths are sometimes also available.

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  • \$\begingroup\$ Thanks for the reference, but alas I was not able to find this specific adapter. I'll keep using the plug from the universal adapter but this "investigation" has become a minor obsession of mine, any additional information or insight is greatly appreciated. \$\endgroup\$
    – Pedro Almeida
    Dec 17, 2022 at 23:00
  • \$\begingroup\$ It certainly is an odd one at that size. I did find this one link... elliottelectronicsupply.com/3-0mm-x-5-5mm-dc-coaxial-plug.html \$\endgroup\$
    – user324996
    Dec 17, 2022 at 23:08

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