Groups > sci.electronics.design > #452892

Re: Low Threshold MOSFET

From	Joerg <news@analogconsultants.com>
Newsgroups	sci.electronics.design
Subject	Re: Low Threshold MOSFET
Date	2017-03-21 08:03 -0700
Message-ID	<ejctkuF5friU2@mid.individual.net> (permalink)
References	<oanlv1$af7$1@dont-email.me> <eja0boFi5kdU1@mid.individual.net> <oapa8h$nq0$1@dont-email.me> <oapm6n$j4c$1@reader1.panix.com> <oaq07v$1mh$1@dont-email.me>

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On 2017-03-20 18:42, rickman wrote:
> On 3/20/2017 6:47 PM, Hul Tytus wrote:
>> Fairchild (whoever now) has a nice n channel device speced, if I remember
>> correctly, at 1 volt max turn on. It served as a voltage follower op amp
>> with lots of offset. They came from Mouser.
>
> Any more info than that?   Threshold voltage is not easy to search on
> because everyone specs it at a different current.  Also the threshold
> voltage can be a *lot* lower than the fully on voltage which is the
> important one.  Or is that what you mean?  Still, it takes a lot of data
> sheet searching to find a part that is optimal for low voltage control
> and that is why I asked here.  I am hoping to benefit from other's
> experience.
>

Don't go by any graphs. Those only represent typical values. The 
processes used for MOSFETs have huge tolerances in threshold voltage, 
easily +/-30%. The only values to go by are guaranteed max Rdson values 
for a stated gate drive voltage. Typically two to five different gate 
drive voltages are spec'd. Must be in the tables.

-- 
Regards, Joerg

http://www.analogconsultants.com/

Thread

Low Threshold MOSFET rickman <gnuarm@gmail.com> - 2017-03-20 00:34 -0400
  Re: Low Threshold MOSFET "Lund-Nielsen, Jorgen" <jorgen.lund-nielsen@xyz123desy.de> - 2017-03-20 13:30 +0100
    Re: Low Threshold MOSFET rickman <gnuarm@gmail.com> - 2017-03-20 15:26 -0400
      Re: Low Threshold MOSFET Hul Tytus <ht@panix.com> - 2017-03-20 22:47 +0000
        Re: Low Threshold MOSFET rickman <gnuarm@gmail.com> - 2017-03-20 21:42 -0400
          Re: Low Threshold MOSFET Joerg <news@analogconsultants.com> - 2017-03-21 08:03 -0700
          Re: Low Threshold MOSFET Hul Tytus <ht@panix.com> - 2017-03-21 23:36 +0000
            Re: Low Threshold MOSFET rickman <gnuarm@gmail.com> - 2017-03-21 20:06 -0400
  Re: Low Threshold MOSFET Allan Herriman <allanherriman@hotmail.com> - 2017-03-20 12:56 +0000
    Re: Low Threshold MOSFET Winfield Hill <hill@rowland.harvard.edu> - 2017-03-20 06:34 -0700
  Re: Low Threshold MOSFET Clive Arthur <cliveta@nowaytoday.co.uk> - 2017-03-20 13:08 +0000
  Re: Low Threshold MOSFET Tim Wescott <tim@seemywebsite.com> - 2017-03-20 11:03 -0500
  Re: Low Threshold MOSFET Joerg <news@analogconsultants.com> - 2017-03-20 15:59 -0700
    Re: Low Threshold MOSFET rickman <gnuarm@gmail.com> - 2017-03-20 22:29 -0400
      Re: Low Threshold MOSFET Joerg <news@analogconsultants.com> - 2017-03-21 08:00 -0700
  Re: Low Threshold MOSFET "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-21 01:02 -0500
  Re: Low Threshold MOSFET kevin93 <kevin@whitedigs.com> - 2017-03-22 07:15 -0700
  Re: Low Threshold MOSFET John S <Sophi.2@invalid.org> - 2017-03-22 09:36 -0500
    Re: Low Threshold MOSFET rickman <gnuarm@gmail.com> - 2017-03-22 14:03 -0400
      Re: Low Threshold MOSFET John S <Sophi.2@invalid.org> - 2017-03-22 13:43 -0500
        Re: Low Threshold MOSFET Winfield Hill <hill@rowland.harvard.edu> - 2017-03-22 12:01 -0700
        Re: Low Threshold MOSFET rickman <gnuarm@gmail.com> - 2017-03-22 15:14 -0400
        Re: Low Threshold MOSFET rickman <gnuarm@gmail.com> - 2017-03-22 15:18 -0400
          Re: Low Threshold MOSFET Joerg <news@analogconsultants.com> - 2017-03-23 10:29 -0700
        Re: Low Threshold MOSFET John S <Sophi.2@invalid.org> - 2017-03-22 15:07 -0500
      Re: Low Threshold MOSFET tabbypurr@gmail.com - 2017-03-23 20:45 -0700
        Re: Low Threshold MOSFET rickman <gnuarm@gmail.com> - 2017-03-24 00:43 -0400
          Re: Low Threshold MOSFET Robert Baer <robertbaer@localnet.com> - 2017-03-23 22:24 -0800
          Re: Low Threshold MOSFET tabbypurr@gmail.com - 2017-03-24 03:59 -0700
            Re: Low Threshold MOSFET rickman <gnuarm@gmail.com> - 2017-03-24 12:50 -0400
              Re: Low Threshold MOSFET tabbypurr@gmail.com - 2017-03-25 00:51 -0700
                Re: Low Threshold MOSFET Joerg <news@analogconsultants.com> - 2017-03-25 09:47 -0700
                Re: Low Threshold MOSFET rickman <gnuarm@gmail.com> - 2017-03-25 13:54 -0400
      Re: Low Threshold MOSFET Joerg <news@analogconsultants.com> - 2017-03-24 09:37 -0700
  Re: Low Threshold MOSFET Robert Baer <robertbaer@localnet.com> - 2017-03-22 20:40 -0800

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