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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. Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. 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.

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Products may be manufactured at datasheet of several qualified locations.

This is the source code that I used: Repetitive rating; pulse width limited by maximum junction temperature see fig. To the maximum extent permitted by applicable law, Vishay disclaims i any and all liability arising out of the application or use of any product, ii any and all liability, including without limitation special, consequential or incidental damages, and iii any and all implied warranties, including warranties of fitness for particular purpose, non-infringement and merchantability.

To tackle this we should use a current limiting capacitor, I have a used a value of here. I’ve attached an actual picture of what I’m working with.

Use Google Search box in upper right side of this page. Then try supplying the NPN base from the arduino pin.

If you are designing a PCB or Perf board with this component then the following picture from the 2N Datasheet will be useful to know its package type and dimensions.


I maybe could have solved this with proper use of diodes, but after a few hours of messing around, I datazheet still stumped. I solved this by simply adding 3 more IRF’s in parallel. Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk.

Remember MOSFETS have an effectively infinite input resistance so if the gate is left floating it will pick whatever ions datasehet floating around in the air, respond to any slight leakage currents that might be present.

The water pump is rated at 12V and 2. 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 looked at the spec for a the IRF, and it looks like it needs 10V to switch it on.

Meaning, they can be turned on or turned off by supplying the required Gate threshold voltage VGS. Please contact authorized Datassheet personnel to obtain written terms and conditions regarding products designed for such applications.

I’d datadheet a 1K from 12V to a capacitor to ground. You might need something to increase the gate voltage for lower internal resistance.

IRF840A Datasheet PDF

And Arduino doesn’t have high-voltage tolerant output pins. Hence it is mostly used with Arduino and other microcontrollers for logic switching. This happens even if I don’t even have the Ardunio hooked up. When you turn on a Ir840a by supplying the required voltage to the gate pin, it will remain on unless you supply 0V to the gate.

Mosfet TO-220 & SMD220 Power MOSFETs

Also, I have no idea how to properly use a PNP transistor, I attempted to run the 12V through 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.


Irf840q last problem that I had was that the thing would overheat pretty bad after a just a few moments of the motor being on. Speed control of motors and Light dimmers are also possible with this Mosfet since it has good switching characteristics.

Another problem you have is that the IRF has an enormous Ron of 0. If not, what do you do, and again, what are the irf840aa components to use? It also has a threshold voltage of 4V, which means it can easily driven by low voltages like 5V.

Trouble with MOSFET

So if you are looking for a Mosfet to switch applications that consume high current with some logic level devices then this Mosfet will be a perfect choice for you. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. Do you do what I did and turn the power on and off really fast?

Available in To package Note: Such statements are not binding statements about the suitability of products for a particular application. MarkT Brattain Jrf840a Posts: B, Mar This datasheet is subject to change without notice. Product names and markings noted herein may be trademarks of their respective owners.

Irfa datasheet pdf

Also of note is that the delay function seems to work just fine if I remove the PWM pin so satasheet it is not connected to anything. So my next question is what is the proper method for giving a motor more and less power?

Here is the part of the code where the delay is not working, I set it up to eliminate any outside factors: Once I did these things, the resistance seemed to drop to zero when I applied 5V to the gate.

You alo need to check the data sheet to see how well it performs with only 5v on the gate. This mosfet can drive loads upto 23A and can support peak current upto A.