Mosfet Tester - Good Design?

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  • MDOC
    EngineeringTech
    • Mar 2010
    • 146
    • USA

    #21
    Re: Mosfet Tester - Good Design?

    Originally posted by budm
    Most MOSFET had D-S reverse breakdown voltage of 30V or more, so 9V is not going to do any damage.
    I don't have a MOSFET databook, but based on an online GlobalSpec MOSFET datasheet parameter search, the least breakdown voltage is 12V, so you're probably right. I found one with 9V breakdown voltage elsewhere, but it's an SMD.

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    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #22
      Re: Mosfet Tester - Good Design?

      I have seen an 8Vds P-FET, with a gate-source voltage limit of +/-8V as well... it was SMD.
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #23
        Re: Mosfet Tester - Good Design?

        The diode is part of the MOSFET. I understand it's possible to make a MOSFET without it -- but it tends to latch up far too much, so it isn't used in practice.
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • Tube_Dude
          Senior Member
          • Feb 2011
          • 51

          #24
          Re: Mosfet Tester - Good Design?

          Originally posted by tom66
          I understand it's possible to make a MOSFET without it -- but it tends to latch up far too much, so it isn't used in practice.
          The word "intrinsic" say it all. It's just not possible to build a Mosfet without the intrinsic parasitic Drain Source Diode.

          See some references:

          http://irf.custhelp.com/app/answers/...ng-psu-outputs.


          https://cdn.badcaps-static.com/pdfs/...3b1facbbe8.pdf

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