To confirm if HFE of a bc549 I found is good

Discussion in 'Homework Help' started by fiatuno, Feb 24, 2012.

  1. fiatuno

    Thread Starter Member

    Jan 28, 2011
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  2. crutschow

    Expert

    Mar 14, 2008
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    The hFE values are not vague, there is just a manufacturing variation from a minimum of 110 to a maximum of 800 and the value you get depends upon the particular transistor you happen to buy. This variation is typical of any transistor although some have a smaller variation.

    So the circuit you use it in needs to be designed to operate properly with an hFE variation over that range. You never design a circuit that requires a particular value of beta to operate correctly.
     
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