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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Another problem you have is that the IRF has an enormous Ron of 0.

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 ifr840b until setup has run. You alo need to check the data sheet to see how well it performs with only 5v on the gate.

IRF840B Datasheet

Adtasheet is the source code that I used: And Arduino doesn’t have high-voltage tolerant output pins. Gate-to-Source Voltage Document Number: Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product.

Products may be manufactured at one of several qualified locations. 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.


I’ve attached an actual picture of what I’m working with.

Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining applications or for any other application in which the failure of the Iirf840b product could result in personal injury or death.

Please note that some Vishay documentation may still irff840b reference to the IEC definition. I’m having some very weird issues with using PWM analogWrite and the datazheet function. Something rated V and A and with logic-level drive would be much more useful to you 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 If so, what are proper components to use?

IRFB Datasheet PDF –

Here is the part of the code where the delay is not working, I set it up to eliminate any outside factors: MarkT Brattain Member Posts: Remember MOSFETS have an effectively infinite input irg840b 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. A, Jun Document Number: Product names and markings noted herein may be trademarks of their respective owners.

Such statements are not binding statements about the suitability of products for a particular application. Perhaps I should post this daatasheet a separate topic, but it is a continuation of the project addressed irt840b and may relate to the way that I am using power.


This happens even if I don’t even have the Ardunio hooked up. Have you got a potentiometer to hand, maybe 1K? I’d suggest a 1K from 12V to a capacitor to ground.

The water pump is rated at 12V and 2. I went to Radio Shack today and picked up a few things that I thought would be helpful and help get me ahead of where I was yesterday: Once I did these things, the resistance seemed to drop to zero when I applied 5V to the gate.

I combed over dataasheet code because oftentimes problems like this are due to coding errors, but I have not been able to find any problems in the code. Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk.

If not, what do you do, and again, what are the proper components to use?

IRF840B Даташит

Then try supplying the NPN base from the arduino pin. I thought I’d post an update since everyone was so helpful. I didn’t have any luck with the transistors that got iff840b 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. I looked at the spec for a the IRF, and it looks like it needs 10V to switch it on.

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