[2583] Power Jack Ratings

Date: June 21st, 2019 | Comments : [4] | Categories: DIY.

Did you know that DC power jacks have a voltage and current rating, and they may not be as high as you would think?

I often buy the Kobiconn 163-1060-EX because it is simple to install since it just snaps into a hole drilled in the enclosure. But as can be seen from the chart below (from the Mouser catalog), it is limited to 12v DC and 500ma.

Only a few of the jacks in the chart are designed to handle 18v and higher inputs. The jack in the photo at the top of this post is the Kobiconn 163-4302-EX, which is one of the most commonly used power jacks for pedals, and it has a voltage rating up to 12v. I suspect that the 24v rating shown in the chart is for the 2.5mm center pin version that is listed on the same datasheet, though there seems to be no data or specs to confirm this. The Lumberg clone/equivalent to the 2.1mm Kobiconn is also rated at 12v so that’s probably a good indication of the rating.

If you know that you may use a pedal at higher than the standard 9v, it would be wise to review the voltage specification on the datasheet for the jack you are using to confirm that it is suitable. For example, the Lumberg 1614-09 jack is rated at 24v and 2A, which should be plenty for most pedals, and there are others that can also meet the requirements for higher voltages.


4 Responses to “Power Jack Ratings”

[786555] chris h. Says: 2:49 pm, July 7th, 2019

Do you have any clarification regarding why a dc power connector could have such a low rating? I did try to find some answers on the web and in available literature and meta-literature/white papers, but not a whole lot of open documentation exists on the voltage rating of such connectors. Regarding e.g. the Kobiconn 163-1060-EX example, the datasheet lists 12 V as the “rating,” but also has figures for insulation resistance (100 MOhm at 500 VDC) and withstand voltage (500 VAC for 1 min), but no information on what the procedures are for those tests.

Personally, I have a hard time believing that any dc supply below several hundred volts would ever cause arcing within the dc power connectors we use, and even considering surges, transients, and the like, as well as the conservative derating system used for determining these ratings based on tested breakdown voltages, I suspect the low “rating” must be based on some other factors.

[786582] admin Says: 2:24 pm, July 9th, 2019

I’m sure they have reasons for providing the ratings but I do not have any insight into how the limits were established.

[786591] Greg Says: 6:45 am, July 14th, 2019

Hi, interesting post.

I mainly use Lumberg 161409 which I chose because of its smaller footprint/drill hole than the one in your picture.

I just noticed though that specs say “Pin diameter 2mm” vs. the commonly used “boss type” power supplies that are 2.1mm? Never had a problem, just asking if you think that could be an issue?


[786602] admin Says: 12:36 pm, July 17th, 2019

2mm is a common size for the pin in many of these jacks that are labeled as 2.1mm. It won’t be a problem, in my experience.


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