Difference Between N Channel and P Channel MOSFETs

Comparison of N Channel and P Channel MOSFETs

  • The P-channel enhancement MOSFETs were very popular, because it was much easier and cheaper to produce than the N channel device.
    But now a days these difficulties have overcome and mass production of N-channel MOSFETs becomes easier.
    Thus the N-MOSFETS have replaced PMOSs and P-MOSFETs have almost become obsolete.
  • The hole mobility is nearly 2.5 times lower than the electron mobility.
    Thus a P channel MOSFET occupies a larger area than the N channel MOSFET having the same ID rating.

    At normal fields, in silicon,
    the hole mobility is 500 cm2/v.sec

    the electron mobility is 1300 cm2/v.sec.
    Therefore the P-channel ON resistance will be twice that of n-channel MOSFET ON resistance.


  1. ON resistance means the resistance of the device when ID is maximum for a given VDS. Its value depends upon μ of carriers.
  2. P-channel device have holes as majority carriers.
  3. N-channel device have electrons as majority carriers.
  • At the same values of ID and VDS, if the ON resistance of P channel device were to be reduced/make equal to that of N-channel device, then the P-channel device must have more than twice the are of N-channel device. Thus the n -channel devices will be smaller is size.
    In other words the packing density of N-channel devices is more (R = ρ. l/ A)
  • N channel MOSFETs are fast switching devices. The operating speed is limited by RC time constant of the device. The capacitance is proportional to the junction cross sections.
  • The N channel MOSFETs are TTL compatible. As the applied gate voltage and drain supply are positive for an n-channel enhancement MOSFET.
  • The drain resistance of P channel MOSFET is 3 times higher than that for an identical N-channel MOSFET.
  • The N-Channel MOSFET has the higher packing density which makes it faster in switching applications due to the smaller junction areas and lower inherent capacitance.
  • The N-channel MOSFET is smaller for the same complexity than P-channel device.
  • Due to the positively charged contaminants, the N-channel MOSFET may turn ON prematurely, whereas the P-channel device will not be affected.

The summary of Difference Between N Channel and P Channel MOSFETs are listed in the following table.

N-Channel MOSFET P-Channel MOSFET
Have higher packing density, leads to small size Comparatively low packing density.
Smaller in size for same complexity Size will be more.
High switching device. (mobility of electrons is high) Low switching speed.  (mobility of holes is low)
Low ON resistance High ON resistance.

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4 Responses

  1. Sellamany says:

    Good and very useful

  2. Erik says:

    Very straightforward and useful summary. Much appreciated!

  3. Lucas says:


    I searched this information for my Technical Engineering (dutch MBO4) studyassigment that contained a N-MOSFET. Very clear information and dense information. Love the table in the end. Thanks a lot

  4. Tom D says:

    Thanks for the explanation on P and N channel MOSFETs. It' been so many years since I thought about it, I nearly forgot.

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