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Pages:  2. Topic: Best mosfet for switching DC from 5v Arduino pin. Read times previous topic - next topic. Best mosfet for switching DC from 5v Arduino pin. For home automation I want to switch some DC current ranging from v. Some 48v led series, strike plates, and allot more. I want to build some universal switching boards that I can use for all DC switching that I need. It needs to switch fast enough to use PWM from an Arduino pin. And works perfect on v. For v AC I will use solid state relays ebay.
I ones used a mosfet IRFN old one for switching fans and leds, but I want to choose the best available, and also more watts. Someone advised me this one Or if they switch fast enough for PWM?
I selected some But will these heavy mosfets work? AWOL Guest. Re: Best mosfet for switching DC from 5v Arduino pin. Firstly you can usually ignore the current rating as power-dissipation is the limiting factor without substatial heatsinking.
The key spec is the Rds on. Very high input capacitances. You can drive the gate from the Arduino with a resistor to limit the pin's current to a safe level for the microcontroller say 25mA max - ohms. For low to medium power loads at low to moderate PWM frequencies this is fine, but driving a high powerload at high frequency PWM this will become prohibitive.
Arduino default PWM is 1kHz or Hz depending on the pin, so this isn't too big an issue unless you change it. These driving chips need proper decoupling but can level shift from 5V to 12V to allow non-logic MOSFETs to be used There is one more issue you need to be aware of which is capacitive coupling between drain and gate.
You mean I can't use one of these mosfets? Are you sure, Vgs th Max is only between v. Quote from: mwhens on Aug 27, , pm. Its usually about 0. Quote from: MarkT on Aug 27, , pm. Thanks for all your information, but I don't understand it all. I made a drawing showing what I want to do, this is the basic principle How I switched some leds a couple of years ago was this way. It worked perfect, did not get hot, I used it with 12v, 3A I now want to make an switching board that I can install in all kind of places for switching DC.
Someone advised me a modern logic mosfet instead of the old IRFN. He advised me this one But I may need more than 68 watt, I gues a max. Thats around watt. I can't understand all those datasheets, I see so much graphs. Can I simply ask whats the biggest mosfet I can easily use the way I drawed? No one of the mosfets I posted above? As far as I know they are all logic level's. The power you can switch is NOT the power rating of the mosfet. A mosfet can switch much more power than it dissipates if it is selected properly and driven properly.
Choose a mosfet whose Vds max rating is comfortably above the voltage you want to switch. Choose a mosfet whose Ids max rating is comfortably above the current you want to switch.
So it will comfortably drive your 48v 4A load and will dissipate only 0. Formal verification of safety-critical software, software development, and electronic design and prototyping. Please do not ask for unpaid help via PM, use the forum. Well some of us are trying to explain the meaning of the specifications so that then you may learn and then use that new knowlege to make your own choices. However you seems to just want someone to say, "use this one, it should work fine". Someone will undoubtedly eventually make that choice for you, but will that help you in the future when you have to again select a component from a raft of choices?
PS: that small transistor looking device in the picture of the arduino that is going to give you "more then 20ma", you are going to have to identify what it is, why you think you need it. I suspect it will not work at all as you suspect it will. I want to learn, but it all seems so complicated to me, mostly all the graphs. But I try to understand.
That would be a better option you say. When I compare them I see it has a higher voltage and amp rating, that I can understand. It has also other differences I can't understand What does this digikey spec tells me, and wich would be better, lower Ohm's? There are more differences Another spec Does that mean how much power is needed to switch on?
Ok, a little bit more clear now, thanks. I was thinking about putting on all output pins of the arduino an small transistor. If all outputs would be high, the Arduino can't power everything I think. To be sure of this, I tought, why not boost it with an transistor. Can that be a problem?
How much current wil an mosfet use normally? Good idea about the resistor. Any other ways to make it an safer switch circuit? Some spook about fuses and zenerdiodes and resistor on the gate, don't know what it all does, or if it's usefull.
But I like to be on the safe side. Ok, I now know it is thermal watts. And also, the 5v and ground from the Arduino will be provided by a long around meter Cat6 cable. That would be ok right? Where can I find a tutorial about using a mosfet gate driver? Does it need any extra power supply?
Is it easy to use?
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