Header current rating.

Discussion in 'The Projects Forum' started by CircuitsExplorer, Mar 16, 2009.

  1. CircuitsExplorer

    Thread Starter Member

    Oct 6, 2008
    Dear all,

    Could someone help me out on this.

    I am quite confused when I looked at those connectors catalog with the headers with the following electrical current rating:

    Current (Individual contacts in isolation) : 3.3A
    Current (All contacts simultaneously) : 3.0A

    How do I intepret the above? I thought if each contact can have a current rating of 3.3A, doesn't this mean if I use all the contacts simultaneously, I can have X number of contacts multiply by the individual contacts current rating?

    Any kind soul out there can help me on this.

    Thanks and best regards,
  2. SgtWookie


    Jul 17, 2007
    The current capacity is somewhat reliant on heat dissipation.

    If a single pin is carrying 3.3A and the adjacent pins 0A, then the single pin is the only place where heat is being generated. However, if all the pins are carrying current, then they're all generating heat.