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Re: Low Threshold MOSFET

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On 2017-03-20 19:29, rickman wrote:
> On 3/20/2017 6:59 PM, Joerg wrote:
>> On 2017-03-19 21:34, rickman wrote:
>>> I was looking to order some low current MOSFETs and realized all the
>>> popular items had thresholds of 3 volts and higher.  I would like to use
>>> something that turns on pretty well at 3 volts so it won't need a 5 volt
>>> PSU.  Any suggestions?  I'm looking for a TO-92 case preferably but
>>> surface mount will be ok too.
>>>
>>> I could have sworn some years ago I tracked down a number of low
>>> threshold voltage FETs.  But maybe those devices operated under 5 volts
>>> rather than under 3.3 volts.
>>>
>>
>> Assuming you want to switch power to some circuit and thus need
>> P-channel:
>>
>> http://www.diodes.com/assets/Datasheets/DMP2100U.pdf
>>
>> Key is that Rdson is guaranteed at your min drive voltage, not just in
>> the graphs but in the tables.
>>
>> N-channel example:
>>
>> http://www.diodes.com/assets/Datasheets/DMP2100U.pdf
>>
>> A beefier one:
>>
>> http://www.diodes.com/assets/Datasheets/ds31837.pdf
>
> The DMP2100U is a P channel and I am looking for an N channel device.
> However, the DMN2075U is N channel and looks like a very good device for
> very low voltage controls.  Actually, I might need the P channel device
> for something else later.  Thanks.
>

You are welcome. They also make duals in small SMT 6-pin packages if you 
are ever fighting real estate on a board.

When it has to be rock-bottom in cost a BJT can be the better choice and 
those also come "pre-biased" where there is a series bases resistor 
inside its package and sometimes also a B-E resistor. Some folks call 
them "digital transistors".

-- 
Regards, Joerg

http://www.analogconsultants.com/

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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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