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Or am I overlooking something?

Using MOSFETS with TTL levels (5 Volt and 3.3 Volt)

Thanks, perhaps we are just discussing terminology here. Every time I tried with new IRF, but any of them worked only for first time. If you come up with an idea I would be happy to hear it.

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This site uses cookies. Sorry, your blog cannot share posts by email. Perhaps one of the wires is corrupt. But then again, if bought at the right place. Thank irrf520 for the clear explanation.

Using MOSFETS with TTL levels (5 Volt and Volt) – Arduino, ESP & Raspberry Pi stuff

Thanks in advance, Ruben. Thanks — You are correct.


You are limited to a current of about mA. I can imagine that a SOT23 indeed can only take a current the size of 7 amps if there hardly is any dissipation read low RDSon. Notify me of new posts via email. I am not sure what datasheet you looked at but I do not see a max of 4Volt, I see a max of ca 20 Volt. Yes you can make it Ohm.

IRF Datasheet(PDF) – STMicroelectronics

I noticed that the range is very low. For the differences, print out both datasheets and look at each value Fill in your details below or click an icon to log in: Post was not sent – check your email addresses! You could consider the FQP27P Sorry no T2 and R1. Was that the same as for the mosfet? I datasneet a IRF Irf502 but now i understand why it became very hot.

That 52 mOhms at 2. Is it possible to use two or maybe three IRF to handle more amperage? Antonio, thank you for expanding. This is for direct transfer so it is already mirrorred the right way. It doesnt look dedicated to a steppermotor though, more to drive a rgular DC motor.

Who can tell me what should I improve i my schematic? The relatively cheap BUZ11 is also an option.


Sign up using Email and Password. The question is the dtaasheet joe provided a solution to in an earlier question, except just as you pointed out, his solution doesnt work because the emitter voltage will be close to 12V and the base voltage from the arduino will be 5V so the transistor will close. Use a baseresistor of say Ohm.

IRF520 Datasheet

If it does open at 3 volt and your PIC supplies that, adding a transistor is not really necesary and if you do it doesnt need to be the BC, can be a regular signal transistor too, like the That is definitely daasheet for most applications. That just will make your circuit much easier and save you a transistor and resistor. Sometimes a MCU seems to be driving a mosfet correctly, but only a careful measurement will show the mosfet is not getting fully turned on, overheating and wasting power.