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CA 3082 alternatives

Discussion in 'Electronic Basics' started by Roger Dewhurst, Mar 23, 2007.

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  1. Are there any alternatives for the transistor array chip CA 3082 which is
    now obsolete.

    R
     
  2. Rich Grise

    Rich Grise Guest

    According to the data sheet, it looks like something like the ULN2003
    could be pressed into service - I haven't bothered to check the pinouts,
    but if all you need is the functionality, that's the one I'd go for.

    Cheers!
    Rich
     
  3. Thanks. Pin outs do not matter. I will grab the data sheet.

    R
     
  4. Rich Grise

    Rich Grise Guest

    But be careful! An ohnosecond after I posted this, I looked at the data
    sheet again, and the 3081 has the emitters in common, but the 3082 has
    the collectors in common - the ULN2003 has the emitters in common, so
    I might have given you a bum steer. Sorry if I've misled you.

    Good Luck!
    Rich
     
  5. They are only to interface between 4026 chips and 7 element LEDs. I thought
    that perhaps the ULN2003 is a little over the top for that job. I have
    found other ones but they are all Darlingtons. I could use single
    transitors but that mean much more wiring and soldering.

    R
     
  6. Gerhard

    Gerhard Guest

    Try digital transistors, also known as biased transistors provided your
    max. continous current is less than 100mA. They save you mounting the
    resistors
    and come in TO92, SOT323 and SC75.

    see On Semiconductor MUN5211T1 as example of bias resistor transistors.
    On www.onsemiconductor.com Go to 'Bipolar Transistors > Bias Resistor
    Transistors'
    on the main page.

    See Fairchild FJN3114R as example of biased transistors.
    On www.fairchildsemi.com go to 'small signal transistor' tab on main page
    and then select 'digital' tab in the left hand column under the 'Function'
    section.

    They come in NPN and PNP nominal 50V 100mA with different bias resistors.
    Some Fairchild and OnSemi devices are available from www.mouser.com in
    small quanteties.

    You can also try low threshold small signal FETs but they tend to be more
    expensive.


    Gerhard van den Berg
    CSIR
     
  7. Gerhard

    Gerhard Guest

    Try digital transistors, also known as biased transistors provided your
    max. current is less than 100mA. They save you mounting the resistors.
    They come in TO92, SOT323 and SC75.

    See On Semiconductor MUN5211T1 as example of bais resistor transistors.
    On www.onsemiconductor.com Go to Bipolar Transistors > Bias Resistor
    Transistors
    on the main page.

    also see Fairchild FJN3114R as exampel of biased transistors.
    On www.fairchildsemi.com go to 'small signal transistor' tab on main page
    and then select 'digital' tab in the left hand column under the 'Function'
    section.

    They come in NPN and PNP nominal 50V 100mA with different bias resistors
    Some of the range are available from www.mouser.com in small quanteties.

    You can also try low threshold small signal FETs, but they tend to be more
    expensive.


    Gerhard van den Berg
    CSIR
     
  8.  
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