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N-channel logic level (3.3V) MOSFETs?

Discussion in 'Electronic Design' started by JeffC, Mar 11, 2007.

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  1. JeffC

    JeffC Guest

    I need a logic level N-channel FET. It only need to handle 100mA so
    something modest in, for example a T092 package would do, but it does
    need to be fully 'on' by 3.3V at the gate. Does anyone have any
    suggestions or 'go to' parts?
  2. Noway2

    Noway2 Guest

    Try searching digikey.

    Personally I have used the FDV301N and FDV303N on several 3.3V boards
    now with great success. Both parts have a maximum Vth of 1.5V with a
    Vgs maximum well above 3.3V.
  3. Ken Smith

    Ken Smith Guest

    I suggest the Supertex TN0702.

    You may be able to get away with the TN0604 if you need higher voltage.
  4. John B

    John B Guest

    The data sheet for the 2N7002 shows a Gate Threshold Voltage of 2.1V
    typical and 2.5V maximum. That should work and you should be able to
    get them just about anywhere.
  5. Jamie

    Jamie Guest

    Look for Hex fets.
  6. MassiveProng

    MassiveProng Guest

    Set your time and date correctly, DIPSHIT!
  7. Ken Smith

    Ken Smith Guest

    Thats 2.5V at 250uA. The worst 2N7002 won't pass enough current at the
    user's conditions.
  8. A mosfet based to threshold voltage is not "fully on".

    The 2N7000 biased with 3.3 volts may not pass 100 mA with
    the whole 3.3 volts across drain to source.

    See Figures 1 and 2 on page 4 of the data sheet:
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