Which transistors should i use?

Hey guys, Im doing a project that i need to turn on a mini fan that has 5v and the IC is 0,140A, i need a transistor is able to my arduino port from 20ma to 140ma, but i dont which one i should be looking for.

puelon:
Hey guys, Im doing a project that i need to turn on a mini fan that has 5

5 of ?

You're looking to sink 140mA?
IRL540 is good, 0.063 ohm on resistance at Vgs = 4V.
https://www.digikey.com/product-detail/en/infineon-technologies/IRL540NPBF/IRL540NPBF-ND/812000
TO220 package, easy to work with.

Like this?
NPNMot-2.png

CrossRoads:
You're looking to sink 140mA?
IRL540 is good, 0.063 ohm on resistance at Vgs = 4V.
https://www.digikey.com/product-detail/en/infineon-technologies/IRL540NPBF/IRL540NPBF-ND/812000
TO220 package, easy to work with.

Thank you for your time to read and help me, im looking to increment the output from the arduino pin that is by default 20ma, to 140ma. I was reading the datasheet it doesnt specify the collector, base and emitter currents. I am very sorry if i understood something wrong. Basically i am trying to do is make a 5v mini-fan work

@outsider i was thinking the same thing, to use a resistor and a NPN 2N2222 like in your schematics, but what would be output current and voltage in your schematics?

MOSFET works similar to NPN (2N2222).
Arduino drives a voltage into the Gate thru 150 ohm resistor, (like R1),
Source connects to Gnd,
Drain connects to the 'bottom' of the motor.

Rds of the MOSFET is very low, so the motor will see almost all of the battery voltage, vs the NPN wasting 0.7V across the Collector-emitter.

FYI
See Q3 circuit.
You replace the relay with your fan.
The 12v would be changed to 5v to match the fan voltage.

Outputs.jpg

Click on the image for full resolution.

Larry,
How did you do that ?
("click on image for full resolution")
Is that a new forum toolbutton ?

CrossRoads:
MOSFET works similar to NPN (2N2222).
Arduino drives a voltage into the Gate thru 150 ohm resistor, (like R1),
Source connects to Gnd,
Drain connects to the 'bottom' of the motor.

Rds of the MOSFET is very low, so the motor will see almost all of the battery voltage, vs the NPN wasting 0.7V across the Collector-emitter.

Very interesting, i will try it, and will update the topic with the results, thanks for the help once again :slight_smile:

raschemmel:
Larry,
How did you do that ?
("click on image for full resolution")
Is that a new forum toolbutton ?

When I click the resolutions is worse,very good function concept.

I didn't know there was a "Resolutions" toolbutton.
That's a new one in me, but then I'm so old, everything is new to me. I went out to my car this morning and it looked new to me. All I did was wash it last week and it still looks new. Must be the rain here in California doing that. Beats ice and snow...

Ice in California ???
I am north of that 2000 km, almost spring.

High altitude gives me headaches.

raschemmel:
Larry,
How did you do that ?
("click on image for full resolution")
Is that a new forum toolbutton ?

Paul__B make a Macro that you can copy and paste, your URL entered as shown.

[center] [url= Your_URL ][img width=500] Your_URL [/img] [/url][/center] [center]
Click on the image for full resolution.[/center]

It looks like a Link embedded in a Link

raschemmel:
It looks like a Link embedded in a Link

or, to be precise, a URL link (to the image) that will be activated when user clicks the image in the [ img ] tags.

CrossRoads:
MOSFET works similar to NPN (2N2222).
Arduino drives a voltage into the Gate thru 150 ohm resistor, (like R1),
Source connects to Gnd,
Drain connects to the 'bottom' of the motor.

Rds of the MOSFET is very low, so the motor will see almost all of the battery voltage, vs the NPN wasting 0.7V across the Collector-emitter.

The NPN won't waste 0.7V in saturation, 0.1V more likely. 0.7V is the base-emitter voltage.

It looks like 0.3V for 50ma and 1.0 for 500 mA
2n2222

CrossRoads:
MOSFET works similar to NPN (2N2222).
Arduino drives a voltage into the Gate thru 150 ohm resistor, (like R1),
Source connects to Gnd,
Drain connects to the 'bottom' of the motor.

Rds of the MOSFET is very low, so the motor will see almost all of the battery voltage, vs the NPN wasting 0.7V across the Collector-emitter.

is there any alternative MOSFET to IRL? i would have to import it, and takes to long lol

Check the MOSFET which you already have, you need a switching mosfet, in data sheet look for threshold voltage less than 5V.
example - IRF540
Gate-Source Threshold Voltage VGS(th) VDS = VGS, ID = 250 μA 2.0 - 4.0 V

https://www.vishay.com/docs/91021/91021.pdf