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
  2. crutschow


    Mar 14, 2008
    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.
    fiatuno likes this.