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JFET and MOSFET comparison

JFET vs MOSFET
JFET vs MOSFET

JFETs and MOSFETs are quite similar in their operating principles and in their electrical characteristics. However, they differ in some aspects, as detailed below :

MOSFET vs JFET
MOSFET vs JFET
  1. JFETs can only be operated in the depletion mode whereas MOSFETs can be operated in either depletion or in enhancement mode. In a JFET, if the gate is forward biased, excess- carrier injunction occurs and the gate current is substantial. Thus channel conductance is enhanced to some degree due to excess carriers but the device is never operated with gate forward biased because gate current is undesirable.
  2. MOSFETs have input impedance much higher than that of JFETs. This is due to negligibly small leakage current.
  3. JFETs have characteristic curves more flat than those of MOSFETs indicating a higher drain resistance.
  4. When JFET is operated with a reverse bias on the junction, the gate current IG is larger than it would be in a comparable MOSFET. The current caused by minority carrier extraction across a reverse-biased junction is greater, per unit area, than the leakage current that is supported by the oxide layer in a MOSFET. Thus MOSFET devices are more useful in electrometer applications than are the JFETs.

For the above reasons, and also because MOSFETs are somewhat easier to manufacture, they are more widely used than are the JFETs.

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17 Comments

  1. jayanarayan sahoo

    thanks for clear my doubt..plz send me the details about MOSFET and difference between the DMOSFET and EMOSFET

  2. Asish GB

    Very useful description. Nice website. Thanks..

  3. shijin

    pls send me some difference betweens of jfet and mosfet

  5. Sreedilal

    Plz send some details about PCB Designing…..Free Software Or Related sites…..
    Thanks…

  6. Abdul Rashid

    All the Description about JFET, & MOSFET is perfect specially performing my Electronic Circuits Experiments.
    I am thoroughly studying .

    Thanks
    Engineer Rashid

  12. M.AJAY KUMAR

    thanks for sending e-mail.i am really very happy with your services.that is very useful for me because it is totally related to my study.ones again thanks.