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LED Vf 1.9v is normal?

Discussion in 'Electronic Design' started by Boki, Apr 24, 2006.

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  1. Boki

    Boki Guest

    Hi All,

    If LED's Vf is 1.9v, is that normal?

    I remember it was about 0.7v, am I right?

    Best regards,
    Boki.
     
  2. Fred Bloggs

    Fred Bloggs Guest

    Yes- even ordinary LEDs hit 2.2V and the high intensity jobs 3.5V-
    nothing unusual about 1.9V.
    No- that is not right, 0.7V is for an ordinary rectifying diode.
     
  3. Boki

    Boki Guest

    Fred Bloggs 寫�:
    Got it, thank you very much!

    Best regards,
    Boki.
     
  4. Pooh Bear

    Pooh Bear Guest

    No. That would be a silicon diode at lowish current.

    It depends on forward current. I run most of my leds @ around 3-10 mA
    and use a typical figure of 1.3V.

    I suggest you look at a data sheet for simple info like this. It's all
    there.

    Graham
     
  5. John Larkin

    John Larkin Guest

    That's reasonable, but it depends on the color. Red is lowest, blue is
    highest. Bandgaps and all that.

    John
     
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