Floating Gate FET

Discussion in 'General Electronics Chat' started by DC_Kid, Feb 28, 2008.

  1. DC_Kid

    Thread Starter Distinguished Member

    Feb 25, 2008
    638
    9
    quik question. do MOSFET's have any floating pin issues commonly found in logic IC's? as example, if i have p-channel MOSFET and i switch the gate to ground to get FET to go "on", if i lift the gate from ground to floating is this a issue? is it best just to tie the gate to +V via a 10k or 20k resistor so it never floats??

    thanks
     
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The gate of a Mosfet has an extremely high resistance. A very small amount of static electricity will destroy it if it is floating. A resistor to +V for a P-channel Mosfet stops the buildup of static electricity.

    A Mosfet with a floating gate stays on for a long time if it was already turned on and it stays off for a long time if it was already off.
     
  3. DC_Kid

    Thread Starter Distinguished Member

    Feb 25, 2008
    638
    9
    i thought i had to.
    thank you.
     
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