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1n4007 is getting hot

Discussion in 'General Electronics Discussion' started by 8bit_brain, May 7, 2017.

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  1. 8bit_brain

    8bit_brain

    6
    0
    May 7, 2017
    I purchased 100x 1N4007 from Amazon. I observed that they are smaller than the ones I used to use.
    Today I observed that at 0.8A they are getting very warm (almost hot). At 1A I cannot keep my finger on them. Is this normal?

    (No documentation was provided by the seller).
     
  2. Alec_t

    Alec_t

    2,982
    807
    Jul 7, 2015
    At 1A the rated Vf is about 0.9V, so the dissipation is 0.9W. Expect the diode to get uncomfortably hot.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,499
    2,839
    Jan 21, 2010
    Can you post a photo of them with a ruler or something beside them for scale.

    Also, if you can measure the voltage drop across them at some known current, it would help confirm what's been said earlier.
     
  4. Audioguru

    Audioguru

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    733
    Sep 24, 2016
    If the diodes are smaller than normal then they are fakes.
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,499
    2,839
    Jan 21, 2010
    Well, if you're expecting something the size of a 1N5404, then smaller is ok. If it's smaller than a 1N4001, then yeah, that's a strong possibility.
     
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