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  1. E

    FET irf640 transistor not working

    at the law current the transistor works as expected. the problem become obvious on 11-12 ohm resistor that laeds to 1A the voltage on Vds is 2V. what makes the system loose voltage and gets hotter.
  2. E

    FET irf640 transistor not working

    We used the same scheme including the flywheel diode. starting to think that the transistor is old and broken :)
  3. E

    FET irf640 transistor not working

    yes, checked twice
  4. E

    FET irf640 transistor not working

    I'm trying to work with IRF640 FET transistor (picture attached). FET transistor picture The problem is when I put 11V on the G-S voltage. The D-S voltage is 4-6 volts or more. Why the transistor doesn't open fully? What am I missing? In the simulator, the voltage falls to 120.18mV.(as...

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