Alternative to BF487

Discussion in 'General Electronics Chat' started by toughspeaker, Sep 14, 2009.

  1. toughspeaker

    Thread Starter Active Member

    Jan 28, 2009
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    Hi guys,

    I was wondering if someone might know if there is a good substitute to the BF487 transistor out there. Ive looked everywhere and found a site that said that BF487can be replaced by BF485, but the BF485 is just as "rare"...

    Any help would be appriciated
     
  2. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    What voltage do you use?
    The BF487 is rated for a VCE of 400 Volts.
    See the datasheet for more info.

    Greetings,
    Bertus
     
  3. toughspeaker

    Thread Starter Active Member

    Jan 28, 2009
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    I'm using it for an 230V application. A substitute is pretty hard to find, isnt it?
     
  4. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    At what frequency should your application work?
    There are some with higher power rating, but lower frequencies.

    Greetings,
    Bertus
     
  5. toughspeaker

    Thread Starter Active Member

    Jan 28, 2009
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    Hi Bertus, thanks for helping out (as usual). I think around 10-50 kHz. It's supposed to be a feedback system for a boost converter.

    Which transistors do you have in mind?

    Would a MPSA44 be a good equivalent/replacement?

     
    Last edited: Sep 14, 2009
  6. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    I think that will do.
    I have attached a table with transistors (unzip and read it in excel).

    Greetings,
    Bertus
     
  7. toughspeaker

    Thread Starter Active Member

    Jan 28, 2009
    40
    0
    Thank you Bertus, very nice of you to share that list with us!
     
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