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Description: If you've ever wondered how to control the headlight of a car from a microcontroller, a MOSFET is what you need. The FQP27P06 is a very common MOSFET with very low on-resistance and a control voltage (aka gate voltage) that is compatible with most 5V microcontroller or mechanical switches. This allows you to control high-power devices with very low-power control mechanisms.

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Comments 20 comments

  • I’m looking at using this to control a motor with an Arduino. The power supply for the motor puts out 11.1v. Does this mean I need an additional element to provide the gate voltage, to bring Vgss up to 0v to switch off the MOSFET?

  • What’s the difference between a P-channel and an N-channel MOSFET?

    • don’t quote me on this, im no expert: a p channel mosfet is used on the positive side of the load whereas an n channel mosfet is used on the negative or ground side of the load. When triggered, a p channel mosfet connects the input on the load to the positive source whereas an n channel mosfet connects the output from the load to ground or the negative source.

      • That’s actually a fairly good description of how they’re used 99% of the time.

        A bit more details: The difference between a P and an N is that an N-channel fet will turn on (aka, conduct) when a voltage greater than the drain&source voltages is applied to the gate, while a P-channel fet will turn on when a voltage less than the drain&source voltage is applied to the gate. Now, in your example, if you wanted to switch something off from the high side (the +5V side), you would use a P-Fet. To turn on the device, connect the gate of the FET to ground. To turn off the device, connect the gate to +5V. This gets a bit trickier when it comes to switching something that needs a higher voltage than what your microcontroller is using, but that can be solved by using an N-fet to invert, then connect it to a P-fet in succession.

        Hope that helps.

  • Can I use this wired directly to the Sparkfun SE-10 PIR sensor, to turn on and off a 20W 12V light? Nothing more intelligent than when signal is low, power to the lamp, signal high power off.

    I have bought an off-the-shelf 12v PIR sensor module (one made by Velleman), but there’s too big a delay between sensing and activating, for what I want it to do. Seems as if there is an internal relay in the unit that is delaying things. Hence looking at some kind of non-relay option.

  • With the gate threshold on this at up to 4V, how could I drive several of these using a PCF8575 IO expander? The output voltages are much lower than 4V.

  • I’m trying to trigger a 12V monitor using one of this P Channel Mosfet.
    I have connected the Arduino to the 12V monitor power source, hopping it can power them both, using the Vin pin.
    Can someone tell how the wiring should be? should I use a register connected to the gate? what should be the resistance?

    • Anyone? was that a good choice to take the P-Channel version? am I missing something?
      I’ll really appreciate your help, as I have all the pieces ready for assembly…

  • Hey guys! Do remember the basic thermals!
    This will heat at 62.5 degree C per watts un ambiant.<br />
    This guy have a 0.070 Ohm RDSon.<br />
    The maximum temp is 175dC.<br />
    Hence:<br />
    175-25=150dC of margin for heat.<br />
    150/62.5 = 2.4W maximal<br />
    P = RI², so: 2.4/0.07 = I².<br />
    I = 5.855Amp.
    So remember: This will pass no more than a safe 5A over ambiant. Anything above that will require serious heat-sinking.

    • And that’s with the FET turned on well. With a VGS of -5V, the on resistance could be on the order of an Ohm and the available current without heat sinking would be an order of magnitude smaller. You definitely shouldn’t expect to get 27 A out of this while controlling it from a 5V I/O pin.

  • Can i use this for The high side in my hbridge that im making using the N-channel version of this ? When i use the N-channel for the high side they dont turn on all the way .
    –Richard

    • For an hBridge, I would consider keeping N channel.<br />
      If they do not turn full on for you, probably you did not gate them with proper voltage.
      Might I recommend an IRS2186 or an IR2011 gate driver?<br />
      These will give you the proper 12V above Vgs to drive those high side with a big rush of current, and allow for very fast turn-on and turn-off.

  • I just want one of these things…. but dang $4 shipping? Can’t ya fire it in an envelope with a $.44 stamp and call it a day? I don’t want a $5 transistor!!!!

    • I see where your comin from but ya gotta check out some other parts too. not only will it make your shipping worthwhile, but you’ll get cool parts and support sparkfun!

  • Why not something like the IRL520 or IRL540? Those are true logic-level gate MOSFETS?

    • Sir, these IRL5x0 parts are N channel. This one is P Channel. P Channel is mostly used as high-side on/off switches.
      The P Channel need a negative gate voltage to activate. So basically, you pull the gate to ground to activate them, instead of giving it a voltage.
      Those IRL parts would be better suited as low-sside switches, where you disconnect the ground from the device, and activate it with a simple MCU IO.

  • “The FQP27P06 is a very common MOSFET with very low on-resistance and a control voltage (aka gate voltage) that is compatible with any 3-5V microcontroller or mechanical switch.”
    It looks like you just copied the text from another MOSFET page, but it’s not entirely accurate for this MOSFET. This FET has a much higher gate threshold voltage (up to 4V) and will not be on well (or at all) at 3V.


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