Jetson nano barrel jack 2.5mm center?

Hi all,

When setting up the Nano dev kit yesterday I was surprised to find not one of the various 5v power supplies I have with 5.5mm x 2.1mm plug would fit the center pin on the nano. It appears to have a 5.5mm x 2.5mm barrel jack. All literature from NVDA and elsewhere claims it should be 5.5mm x 2.1. The dev kit has a S/N with mfg date of 23-2019. Perhaps the BOM changed? Curious if anyone else ran into this.


Hi, per dev kit user guide, [J25] Power jack for 5V⎓4A power supply. Accepts a 2.1×5.5×9.5 mm plug with positive polarity.

@Trumany your answer doesn’t actually address the question from @st360 at all.

I’ve fit what I believe is a 5.5x2.1mm plug in my barrel jack.
Do you have a pair of calipers? Can you measure the diameter of the center contact?

There is no any BOM change on barrel jack on board, it is 2.0mm type. @st360, could you pls share a photo on this?

Hi all,

I appreciate the input and embarrassed to say the problem was between chair and keyboard. I measured with calipers the Nano and two power supplies from another project. Both supplies turned out to be slightly smaller than 2.1mm which was the reason they didn’t fit. I have a correct 5v 4A version ordered and in the meantime using a lab power supply. I hadn’t paid attention to the variations other than 2.5mm and 2.1mm and didn’t realize there are quite a few others.

Many thanks for the responses!