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Suitable diode replacement

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Bob Barrow

Joined: 11 Jan 2006
Posts: 29

Posted: Wed Jul 15, 2009 5:41 am Post subject: Suitable diode replacement

I have blown all 3 diodes on my S701-2 Cross Feed Contactor (through stupidity!!) on my 12 volt Z14 architecture. They are all of the type 1N5400 (3 amp 50 volt). I am having trouble getting replacements locally (Australia) for these specific diodes and I was wondering if I could replace them with the type 1N5404 (3 amp 400 volt) which is readily available.

  

 One of 1N5400 diodes on the Cross Feed Contactor is obviously specifically for voltage spike suppression across the contactor. I'm not sure whether the voltage rating (breakdown voltage for reverse current) on this diode in particular is actually an important factor for spike suppression or not. 

  

 I'd appreciate feedback from any guru out there.

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bob(at)bob-white.com
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Posted: Wed Jul 15, 2009 6:18 am Post subject: Suitable diode replacement

Hi Bob,



The 1N5404 will work fine.



Bob W.

On Wed, 15 Jul 2009 23:25:52 +1000

Bob Barrow <bobbarrow10(at)hotmail.com> wrote:



 	  Quote: 	
		   

 I have blown all 3 diodes on my S701-2 Cross Feed Contactor (through stupidity!!) on my 12 volt Z14 architecture. They are all of the type 1N5400 (3 amp 50 volt). I am having trouble getting replacements locally (Australia) for these specific diodes and I was wondering if I could replace them with the type 1N5404 (3 amp 400 volt) which is readily available.

 

  

 

 One of 1N5400 diodes on the Cross Feed Contactor is obviously specifically for voltage spike suppression across the contactor. I'm not sure whether the voltage rating (breakdown voltage for reverse current) on this diode in particular is actually an important factor for spike suppression or not. 

 

  

 

 I'd appreciate feedback from any guru out there.

 

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nuckolls.bob(at)aeroelect
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Posted: Wed Jul 15, 2009 8:41 am Post subject: Suitable diode replacement

 	  Quote: 	
		  One of 1N5400 diodes on the Cross Feed Contactor is obviously 

specifically for voltage spike suppression across the contactor.


	


   Actually, only ONE of the three is for coil spike

   suppression. The other two are for power steering.

   The idea is that one should be able to close the

   contactor using power from either side of the system.

   I.e. the powered side gets a contactor closed to

   support the non-powered side.



   As long as the diodes are rated at 50v or more,

   ANY diode will work in these applications for

   contactors. Higher current ratings are called

   for with devices like the normal feed path for

   the e-bus . . . which is not needed on Z-14

   systems.



        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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