Searching for Logic Level Mosfets using parametric search?

Discussion in 'General Electronics Chat' started by spinnaker, Oct 25, 2012.

  1. spinnaker

    Thread Starter AAC Fanatic!

    Oct 29, 2009
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    How would I use a parametric search like the one from Mouser to do a search for logic level mosfets?


    Note to admins: Perhaps this can be moved to the Embedded forum and made a sticky once there is an answer?

    And fix the spelling in the title (Searching) please? :)
     
    Last edited: Oct 25, 2012
  2. Ron H

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    Apr 14, 2005
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    You might want to test your link. It does not go to Mouser.

    Here's how I would do it: Go to Mouser.com and
    1. Type "logic level" in the search window.
    2. Select "discrete semiconductors"
    3. Select "MOSFET"
    4. All the parts in the parametric table are logic level MOSFETs.
     
    Last edited: Oct 25, 2012
  3. spinnaker

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    Thanks link fixed. Working with too many links. :)


    I understand logic level is just a marketing tool. It would be nice to know what parameters to select without the use of "logic level".
     
  4. Ron H

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    What do you mean, "marketing tool"? The search I specified (should) narrow the search down to devices whose Rds(on) is specified for Vgs<=5V. Unfortunately, Mouser does not specify Vgs for the Rds spec. I don't see that there is any other way to find logic level devices on the Mouser site.
    Maybe someone else does.
     
  5. spinnaker

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    Basically it is really the specs on the mosfet that makes it a logic level like the one you specified.


    OK so the way I understand it is that you want a low RDS(on) for low power dissipation?

    I need to switch <1 amp at 12Volts. Since this the project is powered from a battery I want the circuit to be as efficient as reasonably possible.

    Is this a good choice?

    http://www.mouser.com/ProductDetail...=sGAEpiMZZMvsEea7gdidXoi8LyX0IJAmNhy8rLTLpbc=
     
  6. crutschow

    Expert

    Mar 14, 2008
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    "Logic Level" means that the lowest ON resistance for the MOSFET, when used as a switch, can be achieved with logic level (typically 5V and sometimes 3.3V) Vgs. It does not necessarily mean it has the lowest ON resistance. Standard MOSFETs (which typically require 10V Vgs for minimum ON resistance) can also have a low ON resistance.

    The main reason to buy a Logic Level device is if you don't have 10V to turn it on.
     
  7. takao21203

    Distinguished Member

    Apr 28, 2012
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    You could use a 20V MOSFET specified for 2 Amps. A 12V battery might have considerable internal resistance already, so 0.5 Ohms (at less than 1 Amp) don't really count.

    If you want to buy 100pcs for $50 or 200pcs for $100, yes good choice.
     
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