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testing a TPCA8A10-H

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    #1

    testing a TPCA8A10-H

    , it's a FET ,negative probe on source and positive on drain with the meter on diode test mode. i am getting 22 milli volts .022. I think it is a Schottky barrier . is this too low? do they have this info on the datasheet, would this be the forward voltage?
    Last edited by LA1; 10-18-2023, 01:28 PM.
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    #2
    Re: testing a TPCA8A10-H

    In circuit or not? 0.022V is too low, there is a short-circuit.
    Flip the leads, what do you get?

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      #3
      Re: testing a TPCA8A10-H

      reverse body diode maybe?

      Comment

        #4
        Re: testing a TPCA8A10-H

        Originally posted by redwire View Post
        In circuit or not? 0.022V is too low, there is a short-circuit.
        Flip the leads, what do you get?
        I get OL open loop. as it should. it's from an HP AIO that it gets a beep code for the crow bar circuit.

        I noticed you are from Canada, great country. about 40 years, closer to 50 now I went to Canada on a motorcycle from Maryland. had a great time. a lot of the people i talked to referred to the United States as the
        'Lower 48" like we were all one big country. there were a few that sill harbored bad feelings about us burning your parliament building in the 1830's

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          #5
          Re: testing a TPCA8A10-H

          Originally posted by stj View Post
          reverse body diode maybe?

          would that be inside the package? all FETs have a Zener from the drain to the source

          what i don't like about FB is you can't add your own hobby, it has to be one of their predefined hobbies. I do rail fanning ( train spotting ) among others that they do not have.

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            #6
            Re: testing a TPCA8A10-H

            most fets have a reverse schotky diode in them.
            Attached Files

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              #7
              Re: testing a TPCA8A10-H

              I would expect a multimeter reading ~300mV on diode-test across the body diode.
              Something is odd with 22mV? so I would test it (multimter) on known good diodes. Maybe it's a 328 tester or something.
              But getting nothing in the flipped polarity, at least means the mosfet is not shorted.
              I have a multimeter with Low Power Ohms that I will use to look for shorts or leakage as well on semi's.

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                #8
                Re: testing a TPCA8A10-H

                i unsolder the FET from the board and it tested at around 175mV (.175) which i believe is in the realm of being good for a Schottky diode.it's a PNP

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                  #9
                  Re: testing a TPCA8A10-H

                  OK that looks fine 175mV for the body diode Schottky at low test current.
                  Generally, mosfets have 3 terminals so 6 possible readings on them.

                  Comment

                    #10
                    Re: testing a TPCA8A10-H

                    look at STJ's datasheet. has the pinouts

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