Use something like Ohms if you want to put a resistor there. This is why you should always have a pullup or pulldown resistor on your MOSFET’s gate if there’s any chance it might be otherwise undriven. I want to put around 10A of current trough a coil to make a partical accelerator. The transistor may burnt. Rds 38mOhm with a Vgs of 3. I think that is not normal.

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At 10 volt it is 4mohm and the fet can take 45 amp, but at 4.

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

The battery is ok and gives a steady 4 volts. The IRF is a better choice: But where can I find K in the datasheet?

Do you have the break out board in the drain or the source? Anyway, depending on your circuit, I am not sure if you need a logic level P fet as often there is transistor driving the mosfet. Sign up using Facebook. Email Required, but never shown. Then you can find the current in the datasheet? Well what an amazing article. Somehow Logic P channel mosfetsarent as plentiful.


I have done like you said. To find out more, including how to control cookies, see here: In cd schematic I use an output with a small resistor Ohms in series with the gate of the N Channel Mosfet STP3NA and my load is in drain like the first schematic showed in this post, but I have no R1 resistor between gate and source, I only have a resistor like R1 in the second schematic.

It start switching on at around 3V and it seems to be quite wide open at 4,5V. Thanks — You are correct.

Aula 8 – Controlo Motor 24VDC MOSFET IRF | engenhocas4you

The driver will have only 2 inputs, allowing off, fw, rev and brake. Now you want to put current through a coil. I would like to use it to switch car heated seat 12V, 8A. So, the bottom line is: You may want to read up here https: I bought it and it works with Arduino. I just need to switch on and off small DC motor.

Try just to test without mitor converter, 3. The circuit should be robust enough to support the load during a few minutes. Switching speed indeed is important.

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

With regard to 9V and 5V input, I presume you mean supply voltage. Glad to be able to contribute!


This is for direct transfer so it is already mirrorred the right way. Rds 38mOhm irrf540 a Vgs of 3. By “no gate voltage applied”, I assume you’re not driving it – it’s unconnected, or connected to high impedance such as an input pin.

The Arduino’s 40mA output maximum per pin is not going to be an issue. I am not sure where you are based but the IRL costs abt 60 cts where I am.

See the reference below: Also, if you have the gate floating, the state of jrf540 mosfet could be undefined. What i like you to do first is to detach the pic-circuit and just put 5 Volt on the entrance of yr FET circuit, via say that ohm resistor, and see if then your lamp behaves the same.