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Diode Dilemma!

Discussion in 'Electronic Components' started by [email protected], Aug 15, 2005.

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  1. Guest

    Here's a question that bears some thought. The common 1N400x family of
    diodes is available in a wide range of breakdown voltages, and, in most
    catalogs, they are all close to, or the same price! Yup, the 200 PIV
    unit and the 1KV part are both about the same price. Now, besides the
    PIV, what's the difference? The factory specs show all the 1N400x
    diodes on the same sheet, all the specs are the same except for the PIV
    rating.

    So the dilemma...Forget about batch testing, and sorting at the
    factory. This is about us! Why would you use the lower PIV diode if
    the higher rated unit, with a wider safety margin, is available at the
    same cost?
    Is there some black magic that after 40+ years in this business I have
    yet to learn?

    Any takers......
     
  2. Don Bruder

    Don Bruder Guest

    Dunno, but I DO know that when I've had 1N400X diodes to replace, the
    replacements that get put in are, more often than not, 1N4007s, unless
    the original was "bigger".

    So I guess that means I tend toward the "same price? Overkill it, baby!"
    end of the spectrum.
     
  3. According to old Motorola data, there appear to be two dies. One for
    1N4001-4005 and another for 1N4006-7. The recovery times are much
    slower (and the junction capacitance less) for the higher voltage die.

    Probably not much difference between the two unless you're doing
    something like a high-audio-frequency C-W voltage multiplier.

    There also is a tiny difference in price, and it continues up into the
    zillion unit price with generic rectifiers. I tend to use the 1N4005
    for everything low voltage (not mains voltage or above).

    Best regards,
    Spehro Pefhany
     
  4. Guest

    Where can I get the specs for the 1N4003. I have 50 of them I'd like
    to sell, but am unsure of the specs.

    Ken WB6QWF
    ohio microwave dottttt commmmm
     
  5. Don Bruder

    Don Bruder Guest

    If you get more than about a buck and a half for *ALL* of them, I'll be
    surprised. Postage to ship them to the buyer is likely to be multiples
    of the sale price. As in "You're wasting your time".

    As for specs for 'em, googling on 1N4003 will give you as many hits for
    them as you care to read through. Betcha one of the first 5 is to a
    datasheet that covers the whole 1N400X series.
     
  6. Google on the part number, first hit gives you a PDF datasheet.

    But they're hardly worth selling. You'll probably do better looking
    for loose change on the sidewalk.


    Best regards,
    Spehro Pefhany
     

  7. http://www.google.com/search?hl=en&ie=ISO-8859-1&q=pdf+datasheet+1N4003&btnG=Google+Search
    has links to datasheets from a number of manufacturers, but they are
    common 2000 PIV 1A rectifiers.


    Now, I have a question for you. I have a tray of 10 NOS Magnum
    Microwave MH22T oscillator modules that were used in the Microdyne
    1100-LPR C-Band Sat TV receivers, and I have been looking for the specs.

    --
    Link to my "Computers for disabled Veterans" project website deleted
    after threats were telephoned to my church.

    Michael A. Terrell
    Central Florida
     

  8. I'm sorry, the MH22T is a 4 GHz mixer in a four lead can a little
    larger than a TO-5. I was in a hurry to leave and didn't realize I had
    posted the wrong description till I was on the highway.

    --
    Link to my "Computers for disabled Veterans" project website deleted
    after threats were telephoned to my church.

    Michael A. Terrell
    Central Florida
     
  9. I'm not sure if this applies to the 1N4001 diodes, but it does to the
    1N5817 thru 19. The higher voltage ones have slightly higher V drop at
    1 amp, so it pays to use the lower V ones if you don't need the higher
    V.

    With things like switching power supplies, the reverse recovery becomes
    important. You really should not use the 1N4001 series with these. But
    the reverse recovery and leakage does make some contribution to the
    power dissipated by the diode, so using a higher V one might be wise.
     
  10. Tom LeMense

    Tom LeMense Guest

    Years ago I was told by a Moto FAE that the higher voltage 1N400x parts have
    a higher dynamic Z figure. I've personally seen higher V drops in "real
    circuits", too, with the higher v parts.

    TJL
     
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