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diode

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robshicla

04-15-2007 17:21:51

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Does any one know if a 1N5404 diode will work in the place of the 1N5408 diode?

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Cliff (VA)

04-16-2007 06:21:29

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Re: diode in reply to robshicla, 04-15-2007 17:21:51

I too will chime in.

It will work just fine. Automotive type noise that might damage the the diode is rarely over 100V. The diodes PIV rating is 200V. You are quite safe. On the other had if you are going buy a diode there is just pennies of difference between the two.

The technical term for the problem that produces these voltages is "Load Dump". If you want a long winded explaination, email me and I will be happy to fill you in with way more than you care to know about load dump. Unfortuantly at one time I had to be an expert on this problem.

Cliff (VA)
Former Automotive Electronics Engineer

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Bob

04-16-2007 20:15:23

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Re: diode in reply to Cliff (VA), 04-16-2007 06:21:29

Cliff,

You didn't happen to be on the design team that came up with the wimpy cruise control relays, and certain other parts that have led to fires and massive recalls of a certain brand of light trucks and SUV's, did you?

(Just "josh'in 'ya, but for the few cents difference in cost, I'll stick with the 1N5408's, which have proven to be VERY reliable "in the field", over 25 years I've worked with these conversions, and are still CHEAP... and we don't have to deal with "bean counters" around here over a few cents!)

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Bob

04-16-2007 05:32:58

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Re: diode in reply to robshicla, 04-15-2007 17:21:51

The recommendation to use the 1N5408 diode was first posted here by me. (AFAIK)

It is shown in the 12-Volt conversion diagrams on my server space.

Third Party Image

I strongly recommend the 1N5408 diode.

It's ratings are WAY overkill for this application, yet it is CHEAP.

Using a lesser-rated diode will PROBABLY work just fine, but in MANY years of doing these alternator conversions, I settled upon the use of that particular diode, since I saw occasional failures with lesser-rated units.

The isolation diode is subjected to voltage spikes from the primary ignition circuit and the alternator rotating field circuit.

At shutdown, when the key is turned to "OFF", the energy stored in the ignition coil may be instantaneously dissipated though the diode.

Bottom line, lesser-rated diodes WILL work, but with the increased chance of an occasional failure.

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old

04-15-2007 18:24:14

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Re: diode in reply to robshicla, 04-15-2007 17:21:51

I always use Radio shack part number 276-1661, I keep a pack on hand all the time because I do a lot of 12 volt conversions

Hobby farm

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Dell (WA)

04-15-2007 18:19:07

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Re: diode in reply to robshicla, 04-15-2007 17:21:51

Rob..... ...quick answer, YES.

The boys done give you the specs so I ain't gonna interpret them..... ...Dell, 40yr Electronics Engr

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Tom N MS

04-15-2007 17:46:39

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Re: diode in reply to robshicla, 04-15-2007 17:21:51

Here is some more info from a previous discussion months ago..... 276-1141 diode ( 3A Barrel diode ) from Radio Shack for in line @ alternator on 12V Conversion..Find an epoxy rectifier... should be 3a, and 200piv or better.. they even have some 6a jobs that are 100 piv or better... just about any silicon diode of 1a/50piv will work.. and for durability.. go for more A and more PIV

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Dunk

04-15-2007 17:40:03

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Re: diode in reply to robshicla, 04-15-2007 17:21:51

1N5404 Diode - 3A / 400V Rectifier - DO-201AD package size.

1N5408 Diode - 3A / 1000V Rectifier - DO-201AD package size.

Maybe that helps...

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