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Well, I'm stuck in choosing DC barrel jack which will supply power for my circuit board from 12V 1.5A AC/DC adapter. Its spec says voltage rating is 18V and current rating is 1.5A. Well.. I know that for IC devices I should supply voltage near the voltage rating to guarantee their proper operations. How about these type of parts like connector, socket, etc... ? Can I just go on with this barrel jack with 12V 1.5A supply?

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    \$\begingroup\$ The voltage rating on a connector is a maximum. Using it at any lower voltage is fine. \$\endgroup\$
    – The Photon
    Jul 26, 2017 at 1:19
  • \$\begingroup\$ @ThePhoton Then I'll go with my DC barrel jack. Thank you. \$\endgroup\$
    – 김현일
    Jul 26, 2017 at 23:40

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As long as you do not exceed the rated voltage or current, your application will be fine.

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