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Voltage thru 9-Pin Mini D

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ctbecker

Joined: 14 May 2006
Posts: 9

Posted: Thu Aug 20, 2009 6:55 am Post subject: Voltage thru 9-Pin Mini D

What is the maximum amperage to run 12vdc thru a 9pin mini 

D connector?

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Aug 20, 2009 8:06 am Post subject: Voltage thru 9-Pin Mini D

At 09:50 AM 8/20/2009, you wrote:

 	  Quote: 	
		  

<ctbecker(at)atlanticbb.net>



What is the maximum amperage to run 12vdc thru a 9pin mini D connector?


	


   5A any pin but I would de-rate to 3A or so for any appliation

   that is continuous duty. You can increase the current that

   passes through a d-sub by paralleling pins.



http://aeroelectric.com/Pictures/Schematics/Paralleled_DSub_Pins.pdf



   . . . again, for continuous duty, de-rate pins to about

   3A and then parallel enough to cover the requirement.

        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------

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rjquillin

Joined: 13 May 2007
Posts: 123
Location: KSEE

Posted: Thu Aug 20, 2009 9:49 am Post subject: Voltage thru 9-Pin Mini D

I've seen this question a few times and some while ago went to source documents for connectors I've seen in use, the AMP series 109 Amplmite.  The AMP web site publishes data for connector/contact derating based on contact current, wire gauge, temperature and percent loading of the connector.  It starts at 100% of the single contact rating for a single connector and AWG-20 wire and derates to 37% of the single contact rating for a fully populated connector; at 'normal' temperatures.  I believe standard density size 20 contacts are rated for 7.5A, while high-density size 22 contacts are rated 5A.  



 Using the AMP ratings a fully populated standard density connector with AWG-20 wire could sustain 2.775 amps per contact.  With AWG-22 wire that decreases to 2.55A.



 So were one to flow 3A through each contact of a fully populated connector with AWG-22 wire, doing so would not be within manufacturers specifications if using an AMP series 109 connector.



 The derating graph and table are on page 6 of the below linked AMP document.



  http://tinyurl.com/n8eret 

 or here for the source

  http://www.tycoelectronics.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Specification+Or+Standard%7F108-1770%7FA%7Fpdf%7FEnglish%7FENG_SS_108-1770_A.pdf 



 Ron Q.



 At 09:04 8/20/2009, you wrote:

 [quote]--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>



 At 09:50 AM 8/20/2009, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "CHARLES T BECKER" <ctbecker(at)atlanticbb.net>



 What is the maximum amperage to run 12vdc thru a 9pin mini D connector? 	


   5A any pin but I would de-rate to 3A or so for any appliation

   that is continuous duty. You can increase the current that

   passes through a d-sub by paralleling pins.



  http://aeroelectric.com/Pictures/Schematics/Paralleled_DSub_Pins.pdf 



   . . . again, for continuous duty, de-rate pins to about

   3A and then parallel enough to cover the requirement.



 

        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------



 



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