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Difference between mosfet with and without logic level.

Discussion in 'Electronic Components' started by [email protected], Aug 22, 2007.

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  1. Guest

    I am looking for a replacement for AOD444, a n-channel mosfet in an
    inverter
    http://www.aosmd.com/web/products/product_display.jsp?displayType=mosfet_part&partnumber=AOD444

    www.aosmd.com/pdfs/datasheet/AOD444.pdf

    AOD 444 , vds :60v, vgs:20v, id: 12A

    I checked digikey.com, but only 2 similar one are available. They are
    IPD640N06L G
    http://www.infineon.com/dgdl/IPD640...90004&fileId=db3a304412b407950112b42ed0ce4a85

    and

    MTD3055VL
    http://www.fairchildsemi.com/ds/MT/MTD3055VL.pdf

    They both look similar to AOD 444, but they are logic level.

    QUUESTION
    Will it work if i substitute a mosfet (without logic level ) with
    another mosfet that has logic level?

    Also, i found another similar one ,std12nf06l
    http://dkc1.digikey.com/Redirect.as...ne/products/literature/ds/8179/std12nf06l.pdf

    The Continuous drain current ID at 25 degree C is the same as aod444.
    BUT it is smaller than AOD444 at 100 C.

    QUUESTION
    When replacing mosfet, do we have to consider the ID at TC=100 degree?
     
  2. Ray King

    Ray King Guest

    Is there a way to see the schematic? There is probably another reason the
    fet failed. More than likely any of the below should work otherwise.
    Ray
     
  3. Steve Wolfe

    Steve Wolfe Guest

    QUUESTION
    Maybe, maybe not. A lot of it depends on just how much Rds you can
    stand. I've seen a number of FETs (particularly on motherboards) which are
    *not* marketed specifically as "logic level", but are designed to operate
    relatively well at 5V, and make an explicit point of it in the datasheet.

    One such part that I have handy is an fr3704. Nowhere does the term
    "logic level" appear in the description or datasheet, but the Rds is 8.4
    milliohms at 10V, and just 11.4 milliohms at 4.5 volts. Unfortunately, it
    doesn't meet the voltage requirement that you need, so it's not a viable
    substitute - but you should be aware that there may very well be parts out
    there that will work for your application yet not specifically labeled
    "logic level".

    steve
     
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