Header current rating.

Thread Starter

CircuitsExplorer

Joined Oct 6, 2008
23
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,
CircuitsExplorer
 

SgtWookie

Joined Jul 17, 2007
22,201
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.
 
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