[SI-LIST] Paralleling Connector Pins

From: "James H. Wise, P.E." <jim.wise.pe@xxxxxxx>
To: <christy_bbb@xxxxxxxxx>
Date: Thu, 12 Dec 2002 11:06:08 -0500
When a connector pin is rated for 1.5 amps, that implies that it is for one
pin only. When you parallel connector pins, i.e., trying to run 1.5 amps
each across six pins, if they are all from the same power supply to the same
load, they will not share the current equally. There will be differences in
the total resistance of the current path from the source to the load.

You must account for two variables. Connector designers like myself and
connector manufacturers will tell you that you must derate the current
carrying capacity of each pin to something less than 1.5 amperes.
Consequently, it will take more than six pins for 9 amps. The amount of
derating is a function of the connector design. Secondly, you must balance
the total path resistance between all the pins in order to make the current
share equally.

Jim Wise
Frog Hollow Design
jim.wise.pe@xxxxxxx


---Original Message---
Msg: #13 in digest
Date: Wed, 11 Dec 2002 18:21:22 -0800 (PST)
From: Christy Benson <christy_bbb@xxxxxxxxx>
Subject: [SI-LIST] Re: (no subject)

Hi, I am using a AMP DIN Connector which has a current carrying capacity of
1.5A at 20 degrees. Basically I am using it as a board to board connector. I
am using the same connnector to deliver power also. What I wanted to ask was
that if I route the same VCC signal to say 6 pins then the VCC signal should
be able to carry 6x1.5A =9A . Say the resistance of the pin is 10mohm then
the max volatge drop would be 1.5 x .01= 15mV. Apart from the extra power
consumption is there any other problem in doing this kind of design. I know
there are higher current carrying connector but I have space issues on the
board hence it would be nice if I could do it this way. Thanks in advance.
Regards,Christy



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[SI-LIST] Paralleling Connector Pins

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