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Need help identifying diode Track and electrical/DCC
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Super User 7,338 posts Deemiorgos Super User 7,338 posts
Deemiorgos

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I have this 1n5408 rectifier diode on my throttle system. It has what appears to be a M below the number on it.

I'm trying to figure out what this means. I think it is a 3A , but don't know what Volt it is. When I look it up on the net, a 1n5408 shows (3A 1000V).

 
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ACR_Forever Prolific poster 1,365 posts
ACR_Forever

Likely just a

Manufacturer's mark.  Some had a stylized first letter of their name, others had more of an icon.  Yours might be Murata, don't know for sure.  Doesn't matter.
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Bernd MRH Author 5,621 posts
Bernd

M?

The diode can handle 3A and up to 1000 inverse voltage. The M might be code for the manufacturers name, such as Mouser.

Bernd

New York, Vermont & Northern Rwy. - Route of the Black Diamonds - NCSWIC
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Michael Rozeboom Regular poster 432 posts
Michael Rozeboom

Generic Diode

That is the manufacturer branding. The 1N5408 is the important number. Sometimes there may be a letter suffix to indicate something specfic to the device. It is a generic diode in the 3A family with many suppliers.

As long as you replace it with something equal to or better than, there is no problem.

As mentioned, 3A forward current, 1000 PIV (reverse voltage), and a voltage drop of 1.2V max.

 
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Deemiorgos Super User 7,338 posts
Deemiorgos

Thank you all. I can now

Thank you all.

I can now order some to have as spares knowing I am getting the right ones.

 
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