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Have you tried using the newly bought transistor with the original motor? From way back when I remember quality of even LEDs being questionable. The irf20n one came from Adafruit and the Arduino kit looks pretty official. To my surprise that actually made the motor spin. This means that you can apply up to 20V difference between pin 1 and 3 on the device – as you mention you satasheet using a 9V battery or a 12V supply, neither of which come close to this maximum rating.

I would say, take some more pictures of the different setups so we can have datashfet look at those, to try and find out what’s going on here. Just as a note to you about Conrad: If this difference is smaller than the “threshold voltage”, found in the datasheet, the switch is “off”.

The old transistor doesn’t heat up noticeably. The voltage difference between the “Gate” and the “Source” pin determines how hard this switch is turned on. As joren vaes suggested I used the new transistors with the old motor and a 9V power supply. If I missed any important information please ask in the comments and I will include it in my post. I would not have thought ir520n it, but I did try it and you are right! Id “Continuous Drain Current” — how much current you can put through the transistor before things start melting or blowing up Vds “drain-source voltage” how much voltage dahasheet transistor can effectively block.


If we go above the threshold, the transistor is turns on. I found the datasheet to the newly acquired transistor listed on the page of the online store I bought it from but I don’t really understand anything it’s trying to tell me.

Since then I decided I wanted to buy more transistors of the same type and I found one which I thought was the same. Datazheet are very usefull parts, and people use them all the time. What does the transistor actually do which I bought and can I still use it for something I actually bought quite a lot of them. Using the 9V batterie with the 12V pump works fine but only with the old transistor.

I’m not even certain they keep track for the on-line supply. I did include the things you were asking for. It works with the original motor and a 9V battery which runs on 9V.

Please be gentle as I am a total newbie with electronics. It was really helpful.

But I couldn’t figure out the problem. With the new transistor the pump moves super slow and the transistor got worryingly hot.

IRFN – Infineon Technologies

Take note that this is not a very “binary” behavior – it’s not like a physical switch that’s either all the way on or all the way off – it’s a more gradual transition. The switch is located “between” the “Drain” and the “Source” terminals. I would just like to add that another very important bit of information in the datasheet is the pinout – in our case the Gate is pin 1, Drain is pin 2, Source is pin 3.


But the original transistor totally works with 12V and the pump but the new transistors dont I tried 3 of them, so it can’t be one which shipped broken do the transistors actually only work with 9V and the one I got from the kit just has a higher tolerance?

In fact, I have a bag of almost 50 IRFN’s a slightly bigger version of your transistor laying around here in my lab Lonely Neuron 5.

They do not practise any quality control or in-store stock tracking, so you cannot always be fully certain the datasheft you got “offline” fits the datasheet, as batches may be mixed. There isn’t really any more valuable information about the transistors which came along if you were hoping for that.

I would very much doubt that the transistors are very different. Post as satasheet guest Name. Feel free to ask me more specific questions!

IRF520N MOSFET. Datasheet pdf. Equivalent

Also, learning to read schematics is essential for doing electronics work. I hope I didn’t do anything wrong. Apparently the two transistors are not completely identical. I know that I wouldn’t need an Arduino for that. So it looks like the new transistor can’t handle the 12V?

IRF IRFN MOSFET N Channel Transistor

Also I couldn’t find the datasheet for the one delivered with the Arduino. I can’t believe that any of the two is.

Could you point out which values in the datasheet are important to me so I can pay attention to those when I look for another transistor? I included a schematic at the bottom.