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Mosfet Tester - Good Design?

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    #21
    Re: Mosfet Tester - Good Design?

    Originally posted by budm View Post
    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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      #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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        #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.

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          #24
          Re: Mosfet Tester - Good Design?

          Originally posted by tom66 View Post
          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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