difference between two mosfets

Discussion in 'The Projects Forum' started by mah, Dec 24, 2013.

  1. mah

    Thread Starter Active Member

    Mar 15, 2010
    276
    2
  2. Griz

    New Member

    Jun 19, 2013
    5
    0
    Part of the confusion here may be that the IRF250 is an N-Channel device while the IRFP250 is a P-Channel device. As far as a semi-conductor of any type being *IDENTICAL* specifications from different manufacturers, they are close but there could be some slight variations. But, that is why we use data sheets, isn't it?

    As I understand it, MOSFET linearity is usually only viable in a narrow range of gate inputs and that's only due to a slight flattening of the performance curve within those parameters, not to true linearity of the device.
     
  3. mah

    Thread Starter Active Member

    Mar 15, 2010
    276
    2
    both of them are N-channel mosfet
     
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    There is no practical difference when using either of these FETS as a voltage variable resistor for MPPT tracing.

    The differences, if any, do not matter when the FET is used in a closed loop opamp circuit where the opamp does whatever is required to set the gate voltage to get the commanded drain current. That is the whole premise of the voltage-driven constant-current sink circuit that we have been discussing here.

    How many threads are you going to start on this topic?
     
  5. mah

    Thread Starter Active Member

    Mar 15, 2010
    276
    2
    till i get answer for my problem , i hope any body help for this random values on gate and drain of the mosfet . i think there is a modification on the circuit.
     
  6. shortbus

    AAC Fanatic!

    Sep 30, 2009
    4,000
    1,512
    Maybe completely off base with this, but wouldn't a Jfet be a better component for this application? Never used one but, aren't they are more for linear use than a Mosfet.
    http://en.wikipedia.org/wiki/JFET
     
Loading...