hFE ---> whether the transistor is good or bad ?

Discussion in 'General Electronics Chat' started by ranatungawk, Nov 8, 2014.

  1. ranatungawk

    Thread Starter Senior Member

    Oct 30, 2008
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    Measuring the hFE value of a transistor, can it be decided whether the transistor is good or bad ?
     
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    Sure.
     
  3. ranatungawk

    Thread Starter Senior Member

    Oct 30, 2008
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    How ? ....if it's out of the range (Ex: 10 - 200, it's= 8) it's bad ??
     
  4. shteii01

    AAC Fanatic!

    Feb 19, 2010
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    Exactly.
    Exactly. If it is out of range, then it is bad.
     
  5. ScottWang

    Moderator

    Aug 23, 2012
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    We will treated it as a damaged parts, you can using a circuit with a different voltage as 5V, 10V,15V to amplifying the current and to see how is the hfe.
     
  6. crutschow

    Expert

    Mar 14, 2008
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    But note that most transistor failures are a complete failure to work. A low Hfe failure is rare.
     
  7. ScottWang

    Moderator

    Aug 23, 2012
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    Yes, almost I met they were ce open or ce shorted.
     
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