Diode information

Discussion in 'General Electronics Chat' started by bundick, Oct 22, 2009.

  1. bundick

    Thread Starter Active Member

    Dec 19, 2007
    97
    1
    Looking at power diodes I see 4001-4007's.
    What do the different 400X numbers mean?

    I intend to make a Rectifier for a B&S lawn mower engine to replace a shorted Rectifier.
    Looking at sellers who only put up the 400X number.

    I think I need PIV of 50 or more and at least 10 watts.
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    X changes with progressively higher PIV ratings. 1 is 50PIV (marginal for you) to 7 is 1000PIV
     
  3. bundick

    Thread Starter Active Member

    Dec 19, 2007
    97
    1
    Good, thank you. I could use 1004's easily then.
    Dick
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,647
    2,346
    Hello,

    The 1N400X series is for 1A in the range from 50 - 1000 Volts.
    The 1N540X series is for 3A in the same range.

    See th datasheets.

    Greetings,
    Bertus
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    It would help to know just a bit more about your application.

    Are you attempting to repair an alternator on the lawnmower engine? eg: riding lawnmower?

    The 1N540x series is much more robust, as Bertus indicated. Your local Radio Shack stocks both 1N400x and 1N540x series rectifier diodes. You are better off to use a rectifier diode with a higher current rating than you need, than to use too low of a current rating.
     
  6. bundick

    Thread Starter Active Member

    Dec 19, 2007
    97
    1
    Thanks Sarge n' Bertus.
    I am trying to repair a B&S 14.5 Hp engine. It's not charging and runs the battery down in a few minutes.
    Almost certain it's the Rectifier.
    I thought I would make one of my own.
    I'll see what RS wants for their 1N540X series Diodes. Local buying is best.
     
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