Alternative MOSFET for TN0201L

Discussion in 'The Projects Forum' started by sprigo, Nov 21, 2013.

  1. sprigo

    Thread Starter New Member

    Nov 17, 2013
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    Hi
    I would like to build an isolated 4-20mA receiver and have found an example of a circuit that fits my needs perfectly on page 9 of the IL300 application note .

    The problem I have is that it uses a TN0201L N Channel MOSFET which now obsolete. Can anyone recommend a replacement that I could use in this circuit? I've tried matching the specification but with little luck so far.
     
  2. wayneh

    Expert

    Sep 9, 2010
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    The first AN I pulled up was from Vishay, and there's no MOSFET on page 9. Please post the relevant schematic.

    Oh wait, maybe I found it ?:
    [​IMG]
     
  3. sprigo

    Thread Starter New Member

    Nov 17, 2013
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    Yep that's the one.
     
  4. wayneh

    Expert

    Sep 9, 2010
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    I think any logic-level N-type MOSFET with a similar or higher current rating should work fine.
     
  5. sprigo

    Thread Starter New Member

    Nov 17, 2013
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    Many thanks for your help Wayneh.
     
  6. wayneh

    Expert

    Sep 9, 2010
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    Go ahead and pick something and let the pros here offer comments. They might see something we've missed.
     
  7. sprigo

    Thread Starter New Member

    Nov 17, 2013
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    OK, so I'm now looking at using an IRFD210PBF as a replacement.
     
  8. t06afre

    AAC Fanatic!

    May 11, 2009
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  9. wayneh

    Expert

    Sep 9, 2010
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    That's not a logic level MOSFET. It's a "regular" one and needs too high a voltage on its gate to turn fully on, with the mediocre voltage of that schematic.

    Maybe VN10LP or VN2222? Or RFP30N06LE or FQP30N06L.

    I'm sure folks here have other favorites.
     
    Last edited: Nov 22, 2013
  10. alexfreed

    Member

    Oct 8, 2012
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    10
    Just as 2N2222 is an "any" NPN transistor, I usually use 2N7000 MOSFETs. Cheap, available in both SOT23 (2N7002) and TO92 cases. Typical switch voltage 2.1 V
     
  11. wayneh

    Expert

    Sep 9, 2010
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    I was going to mention the popular 2N7000, but isn't it a regular (not logic) MOSFET?
     
  12. sprigo

    Thread Starter New Member

    Nov 17, 2013
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    I see where I went wrong with the first alternative I thought about using (embarrassing really).

    When initially faced with the datasheet my eyes glazed over but, in this application, there aren't very many 'important' parameters that I need consider.

    Thanks guys for the help.
     
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