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Help With OptoIsolator Specifications

Discussion in 'Electronic Basics' started by Mike, Oct 23, 2003.

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  1. Mike

    Mike Guest

    Hi,

    I'm trying to understand the specification of an NTE 3044
    (http://www.nteinc.com/specs/3000to3099/pdf/nte3044.pdf). I'm think
    I'm OK on the diode side in that it requires 1.15V to switch on and
    the maximum forward voltage is 2V however I'm not at all clear on the
    transistor side.

    How can I figure out from the specs if I can hook the transistor up to
    a 5V 4mA circuit? What I think I'm reading is that the breakdown
    voltage is 80V.

    Can someone help clarify this for me and may explain some of the terms
    (dark current, V(BR)CEO etc.)

    Thanks in advance.

    Mike
     
  2. Lord Garth

    Lord Garth Guest

    Dark current is the current that will leak through the transistor when the
    LED is dark. Hey, nothings perfect in the real world!

    Vbr is the break down voltage...this potential, when applied to the
    transistor
    will (likely) destructively pass regardless of the base.

    Vceo is the voltage with the collector and emitter open circuited.
     
  3. CFoley1064

    CFoley1064 Guest

    Hi,
    The NTE3044 is a cross for the H11G2, now manufactured by Fairchild and a
    couple of other outfits. You might want to look at the datasheet to get more
    complete specifications:

    http://www.fairchildsemi.com/ds/H1/H11G2.pdf

    If you're new to optocouplers, you might want to find an older Motorola
    optocouplers databook. The General Applications section at the beginning is a
    very good intro to the subject.

    Good luck.
    Chris
     
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