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They do not practise irf502n quality control or in-store stock tracking, so you cannot always be fully certain the device you got “offline” fits the datasheet, as batches may be mixed. 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?

(PDF) IRF520N Datasheet download

Post as a guest Name. Email Required, but never shown. 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.

I included a schematic at the bottom. Why is that transistor not working? By clicking “Post Your Datxsheet, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these iirf520n.

I can’t believe that any of the two is. Lonely Neuron 5. Using the 9V dataeheet with the 12V pump works fine but only with the old transistor. 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. 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.


HOWEVER, there is a slight possibility that the one you bought has different pin assignments than the original, so you might have it wired wrong.

It works with the original motor and a 9V battery which runs on 9V. I also included some info dataeheet an experiment I did with pump and 9V. 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?

So it looks like the new transistor can’t handle the 12V? Home Questions Tags Users Unanswered. The old transistor doesn’t heat up noticeably.

I have started my own little project and bought a 12V pump and hooked it up just as I previously did with the motor from the kit and it worked perfectly see picture.

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.

The switch is located “between” the “Drain” and the “Source” terminals. The other comes from the biggest electronics store here in Germany and Austria conrad. With the new catasheet the pump moves super slow and the transistor datasheey worryingly hot. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


I also checked your picture, and it seems like you wired the transistor up correctly. I would very much doubt that the transistors are very different. Also, learning to read schematics is essential for doing electronics work.

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.

Since then I decided I wanted to buy more transistors of the same datadheet and I found one which I thought was the same.

IRFN MOSFET Datasheet pdf – Equivalent. Cross Reference Search

The first one came from Adafruit and the Arduino kit looks pretty official. I did include the things you were asking for. I would not have thought about it, but I did try it and you are right!

Ill include that in the post. Joren Vaes 8, 15 Have you tried using the newly bought transistor with the original motor? Thanks for the reply!

The voltage difference between the “Gate” and the “Source” pin determines how hard this switch is turned on. So my questions are: If we go above the threshold, the transistor is turns on. 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. It was really helpful.