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MOSFET to replace a relay

Discussion in 'General Electronics Discussion' started by Rajinder, Sep 12, 2016.

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  1. Rajinder

    Rajinder

    531
    9
    Jan 30, 2016
    Hi,
    I need to replace a relay with a MOSFET. The relays have very low contact rating is 30milli ohm. I need to switch low value resistors typically 0.2R.

    I am measuring currents in the 2uA range, so can't afford that to be affected.
    The relays are controlled from a PIC micro. Is there any MOSFET I could use?
    Best regards,
    Raj
     
  2. Minder

    Minder

    3,076
    657
    Apr 24, 2015
    Look in the IR IRL series, the IRLZ44S for e.g. is 28milli ohm.
    logic gate.
    Max
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,490
    2,831
    Jan 21, 2010
    If the voltage is low, there are many options. Some as low as single digit milliohms.

    For such low currents I cant see the resistance being a huge issue. Are you really concerned with nanovolt differences in voltage?
     
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