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Homework Help: How is this transistor been killed?

  1. Nov 17, 2009 #1
    This is a homemade failure and i need to find out how is the transistor damaged after summited to these 3 tests:

    test 1. base: pump in correct Vbb
    emitter: grounded
    collector: open

    test 2. base: open
    emitter: open
    collector: pump in correct Vcc

    test 3. base: pump in correct Vbb
    emitter: grounded
    collector: pump in correct Vcc

    Can any1 explain to me how is the transistor damage by these tests.
  2. jcsd
  3. Nov 17, 2009 #2


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    Science Advisor

    Either of tests 1 and 3 could kill it if you just applied voltages without any respect to current levels. Test 3 is the most likely (almost garanteed to) kill it if nothing is provided to limit the current.

    BTW. What was the value of Vbb that you used anyway?
  4. Nov 17, 2009 #3


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    Homework Helper

    How could test 2 possibly kill it?

    I don't understand what is meant by "pump in correct [voltage]". So, I just assume that means connect to some supply voltage (with low output impedance as alluded to by uart).
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