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Since then I decided I wanted to buy more transistors of the same type and I found one which I thought was the same. Apparently the two transistors are not completely identical. 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. Also I couldn’t find the datasheet for the one delivered with the Arduino.
If I missed any important information please ask in the comments and I will include it in my post. I included a schematic at the bottom. As joren vaes suggested I used the new transistors with the old motor and a 9V power supply.
To my surprise that actually made the motor spin. So it looks like the new transistor can’t handle the 12V? Using the 9V batterie with the 12V pump works fine but only with the old transistor. With the new transistor the pump moves super slow and the transistor got worryingly hot.
The old transistor doesn’t heat up noticeably.
As suggested by joren vaes i made another photo of the setup which shows the wiring properly and photos first pagesecond page of the instructions which came along in the kit. There isn’t really any more valuable information about the transistors which came along if you were hoping for that.
I know that I wouldn’t need an Arduino for that. 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.
The big metal tab is also connected to the Drain terminal, internally so watch out when working with the transistor, since this metal piece is at the same voltage as part of your circuit! This pinout is different for different parts and different manufacturers, so datashee a good idea to verify this from the manufacturers’ datasheet every time you are using a new part. This means that you can apply up to 20V difference between pin 1 and 3 datasheeh the device – as you mention you were using a 9V battery or a 12V supply, neither of which come close to this maximum rating.
IRF520N MOSFET. Datasheet pdf. Equivalent
This cannot be our problem. I also checked your picture, and it seems like you wired the transistor up correctly. I would say, take some more pictures of the different setups so we can have a look at those, to try and find out what’s going on here.
Perhaps also point to the location of the tutorial you started out with, telling you how to wire up the mosfet in the original experiment. I would usually link to the wikipage, but unfortunatly the one on MOSFETs is really quite complicated and I fear it will do more harm than good.
The switch is located “between” the “Drain” and the “Source” terminals. The voltage difference between the “Gate” and the “Source” pin determines how hard this switch is turned on. If this difference is smaller than the “threshold voltage”, found in the datasheet, the switch is “off”. If we go above the threshold, the transistor is turns datashret. Take note that this is not a very “binary” behavior iff520n 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.
These are very usefull parts, and people use them all the time.
In fact, I have a bag of almost 50 IRFN’s a slightly bigger version of your transistor laying around here in my lab There also exist “depletion mode” transistors – here the transistor is already turned on at 0V!
Depletionmode MOSFETs are very uncommon outside of specialized scenarios – so much so that most people in the last years of the EE bachelors won’t even know they exist, but I felt it was worth mentioning them here, for completeness sake.
IRFN Datasheet(PDF) – Inchange Semiconductor Company Limited
So my questions are: Why is that transistor not irf520 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?
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. I know that I wouldn’t need an Arduino for that ; Edit 3: I hope I didn’t do anything wrong. Lonely Neuron 5. Have you tried using the newly bought transistor with the original motor? Also, learning to read schematics is essential for doing electronics work.
It’s really simple – the only difficult part for a beginner will be understanding the symbols. Feel free to ask me more specific questions!
I would very much doubt that the transistors are very different. I would not have thought about it, but I did try it and you are right! It works with the original motor and a 9V battery which runs on 9V.
Transistor IRFN not working as expected – Electrical Engineering Stack Exchange
Ill include that in the post. 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 ird520n 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?
I can’t believe that any of the two is. The first irf5520n came from Adafruit and the Arduino kit looks pretty official. The other comes from the biggest electronics store here in Germany and Austria conrad.
Just as a note to you about Conrad: They do not practise any quality control or in-store stock tracking, so you cannot irf20n be fully certain the device you got “offline” fits the datasheet, as batches may be mixed.
I’m not even certain they keep track for the on-line supply. From way back when I remember quality of even LEDs being questionable. What does the IRFN actually do: Joren Vaes irf520b, 15 Thanks a lot for the detailed post. I did include the things you were asking for. I also included some info about an experiment I did with pump and 9V.
(PDF) IRF520N Datasheet download