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Which leg is which for PNP power MOSFET IRF5305PbF?

Discussion in 'Datasheets, Manuals and Component Identification' started by seanspotatobusiness, Apr 29, 2019.

  1. seanspotatobusiness

    seanspotatobusiness

    193
    4
    Sep 11, 2012
    I have PNP power MOSFETs called IRF5305PbF. The datasheet doesn't say which leg is which. Should it be obvious?
     
  2. 73's de Edd

    73's de Edd

    2,678
    1,085
    Aug 21, 2015
    Sir seanspotatobusiness . . . . .


    WHUT you taklin' 'bout . . . . . . . . . . Willis ?
    Whut you gonna do . . . . . .wire this up to a "tater " eye incubator ?
    Notice that it has 2 drain connections ∴ you could change out the cooling oil in a HURRY on that sucker !

    upload_2019-4-29_1-17-26.png

    73's de Edd

    My wife and I always compromise . . . How? . . . “I admit I am wrong and she agrees with me!”




     
    Last edited: Apr 29, 2019
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    9,231
    1,861
    Nov 17, 2011
    You can't.
    PNP is a bipolar transistor, not a MOSFET. What you have is a P-channel MOSFET.
     
  4. 73's de Edd

    73's de Edd

    2,678
    1,085
    Aug 21, 2015
    "Notice that it has 2 drain connections" ( OPTIONS)
     
  5. seanspotatobusiness

    seanspotatobusiness

    193
    4
    Sep 11, 2012
    Thanks very much. It was for a project to light a green LED whenever my ESD grounding point is connected to ground but it turns out that neither a transistor nor MOSFET is suitable (a MOSFET even less so because it lights up when I touch the probe without a need for two connections to ground).

    Do you think it's sketchy to connect my PSU ground to earth for this? The PSU will be a PC PSU and used to power a few other pieces of equipment (network switch, Raspberry Pis, label printer). Originally I was advised to use a "high side" circuit but they're too sensitive and light the LED even when the connection to ground is poor.
     
  6. Harald Kapp

    Harald Kapp Moderator Moderator

    9,231
    1,861
    Nov 17, 2011
    The ESD grounding point is usually connected to earth potential using a resistor in the MΩ range. The explanation is e.g. here.
    The circuit in your link may be suitable when you replace the NPN by a MOSFET. You'll have to add a resistor from gate to source to reduce sensitivity to small charges (as you have noticed). Also a series resistor and a zener diode to protect the gate from overvoltage are advisable. Hre's a rough sketch:
    upload_2019-5-1_10-21-9.png
     
  7. Cannonball

    Cannonball

    170
    47
    May 6, 2017
    Sir that is real diplomacy!
     
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