Connect with us

1n4007 is getting hot

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

Scroll to continue with content
  1. 8bit_brain


    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


    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

    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


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

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    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.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day