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Question about transistor substitutions.

Discussion in 'Electronic Basics' started by [email protected], Aug 21, 2005.

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  1. Guest

    In most circuits could a 2n3904 be used in place of a 2n4401, and a
    2n3906 in place of 2n4403? 906 is the pnp and 904 is npn, right?
  2. The 3906 is a PNP and the 3904 is an NPN. So yes. Also, the 4401 is
    an NPN and the 4403 is a PNP. I'd imagine that for most common
    purposes, the NPNs and PNPs could be exchanged for each other. Their
    forward betas are similar, junction capacitances aren't too far apart,

  3. Just to be clear about it, I meant "the two NPNs could be exchanged
    for each other and the two PNPs could be exchanged for each other."

  4. Guest

    I figured, thanks your help! you just saved a penny pincher from
    spending an extra dollar or two.
  5. Ralph Mowery

    Ralph Mowery Guest

    In most common circuits operating below a megacycle or so you can subistute
    just about any transistor that is any where close to the origional
    transisitor. The operating conditions are mostly set by the external
    components. You only get into trouble if it is special such as low noise
    or high gain. Just watch the voltage and power ratings of the transistor.
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