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Q&A What is the popular 12 V DC jack connector?

There is no "standard" 12 V DC jack. Asking end users to buy a separate power supply is asking for trouble. Don't expect users to know about center-positive versus center-negative, and inner and ...

posted 3y ago by Olin Lathrop‭

Answer
#1: Initial revision by user avatar Olin Lathrop‭ · 2021-05-31T13:34:53Z (over 3 years ago) 
There is no "standard" 12 V DC jack.  Asking end users to buy a separate power supply is asking for trouble.  Don't expect users to know about center-positive versus center-negative, and inner and outer barrel diameter.

If this is an OEM product, then you can provide binding posts or even just labeled solder pads for +12 V and the return.  Otherwise, your product should come with whatever power supply is needed.