IRFB V N-channel B-FET / Substitute of IRF & IRFA. These N- Channel enhancement mode power field effect transistors are produced using. IRFB datasheet, IRFB pdf, IRFB data sheet, datasheet, data sheet, pdf , Fairchild Semiconductor, V N-Channel MOSFET. IRFB Datasheet PDF Download – V N-Channel MOSFET, IRFB data sheet.

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The water pump is rated at 12V and 2. This is its listing on Ebay: My problem is that it never seems to be in an off state, as soon as I connect the power, the pump turns on and the MOSFET gets really hot.

IRFB Datasheet (PDF Download) 1/10 Page – Fairchild Semiconductor

This happens even if I don’t even have the Ardunio hooked up. I’ve attached an actual picture of what I’m working with. You alo need to check the data sheet to see how well it performs with only 5v on the gate. You might need something to increase the gate voltage for lower internal resistance. Use Google Search box in upper right side of this page. Have you got a potentiometer to hand, maybe 1K?

I looked at the spec for a the IRF, and it looks like it needs 10V to switch it on. And Arduino doesn’t have high-voltage tolerant output pins. MarkT Brattain Member Posts: Remember MOSFETS have an effectively infinite input resistance so if the gate is left floating it will pick whatever ions are floating around in the air, respond to any slight leakage currents that might be present. Tying the gate to the source with a high value resistor is a good plan as people have mentioned, such as 1Mohm, so that its safely off until setup has run.


You simply need to drive its gate from a NPN transistor with pull-up to 12V – however the pump might be putting spikes onto the 12V rail which might be an issue. I’d suggest a 1K from 12V to a capacitor to ground.

IRF840B PDF Datasheet浏览和下载

Another problem you have is that the IRF has an enormous Ron of 0. Something rated V and A and with logic-level drive would be much more useful to you Then try supplying the Idf840b base from the arduino idf840b. I thought I’d post an update since everyone was so helpful. I went to Radio Shack today and picked up a few things that I thought would be helpful and help get me ahead of datasheeet I was yesterday: I didn’t have any luck with the transistors that got from Radio Shack, I actually just ended up getting the original IRFs that I had to work by using 4 in parallel to prevent them from overheating.

Both lowered resistance, but still kept maybe 2k ohms.

Also, I have no idea how to properly use a PNP transistor, I attempted to run the 12V irf480b the PNP and use the Arduino’s 5V to turn it off an on, however this did not seem to work and I ran into all kinds of crazy issues such as power seeming to run back through the gate from the collector.

I maybe could have solved this with proper use of diodes, but after a few hours of messing around, I was still stumped. This apparently produces a 1V signal. I found that “analogWrite 9, ” worked better.

Once I did these things, the resistance seemed to drop to zero when I applied 5V to the gate.

The last problem that I had was that the thing would overheat pretty bad after a just a few moments of the motor being on. I solved this by simply adding 3 more IRF’s in parallel. When I first heard of MOSFETs and saw some pictures, I said there is no way they can carry the load that they are rated at, it takes thick wire to carry significant amounts of power, not these tiny little pins So my next question is what is the proper method for giving a motor more and less power?


IRFB 데이터시트(PDF) – Fairchild Semiconductor

Do you do what I did and turn the power on and off really fast? If so, what are proper components to use? If not, what do you do, and again, what are the proper components to use? This is the datashert code that I used: Here are some examples, to illustrate what is available http: Perhaps I should post this in a separate topic, but it is a continuation of the project addressed above and may relate to the way that I am using power.

I’m having some very weird issues with using PWM analogWrite and the delay function.

(PDF) IRF840B Datasheet download

Also of note is that the delay function seems to work just fine if I remove the PWM pin so that it is not connected to anything. I combed over the code because oftentimes problems like this are due to coding errors, but I have not been able to find any problems in the code.

Here is the part of the code where the delay is not working, I set it up to eliminate any outside factors:

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