Can I use this type of transistors(https://www.reichelt.de/Transistors-IRFB-IRFI-/IRFB-31N20D/3/index.html?&ACTION=3&LA=2&ARTICLE=90239&GROUPID=2892&artnr=IRFB+31N20D) to controll these RGB leds :
60 LED per Meter
864 lumens/meter
Power consumption 6 Amps, 14.4 watts
60 lumens per watt
Read the datasheet.
That MOSFET gas an RDS(ON) of 82 mohms , which means 6A will dissipate 3W in the device.
Also , the gate threshold max is 5.5V which means it's not a logic level MOSFET and the ardui o signal is very close to the minimum to turn on the device. You would need a heatsink.
Bottom line, it's marginal. It can handle current but you would barely be able to turn it on.
Can't you get the FQP30N06 from sparkfun ?
How about this one? 
https://www.reichelt.de/Transistors-IRFB-IRFI-/IRFB-3806/3/index.html?&ACTION=3&LA=2&ARTICLE=90244&GROUPID=2892&artnr=IRFB+3806
Can you help me to find the right one in this page please?
https://www.reichelt.de/Transistors-MOSFET/2/index.html?&ACTION=2&LA=2&GROUPID=2889
It would be a great help, because I'm not sure which one should I use.
Thank you very much!
Sorry, I don't read German.
raschemmel:
Sorry, I don't read German.
They have an English version of the page too
If you can help me please .
No, you need a logic level MOSFET, they will have Rds(on) specified for Vgs = 4.5V, not just for 10V.
If Rds(on) is only specified for 10V, then the MOSFET is designed to be driven with 12V on the gate,
not 5V.
Ignore the threshold voltage rating, that's the point the device turns fully off, not on.
MarkT:
No, you need a logic level MOSFET, they will have Rds(on) specified for Vgs = 4.5V, not just for 10V.If Rds(on) is only specified for 10V, then the MOSFET is designed to be driven with 12V on the gate,
not 5V.Ignore the threshold voltage rating, that's the point the device turns fully off, not on.
Thank you very much!
I found these Logic Level Gate MOSFETs:
Which one do you think will work best if I want to power 3 meters of leds! (twenty segments per meter for the 60/LED per meter strip) = 1.2 Amps per meter)
Thank you!
I know this is a silly question but are you looking at any of the specs for these ?
Is there some reason if you are asking if you should use a mosfet rated for 120A on a project you say requires 6A ? Do you see the disparity there ?
I would go with
IRLIZ 44N :: Power MOSFET N-LogL TO-220-FU 55 V 30 A
(the LAST one)
raschemmel:
I know this is a silly question but are you looking at any of the specs for these ?
Is there some reason if you are asking if you should use a mosfet rated for 120A on a project you say requires 6A ? Do you see the disparity there ?I would go with (the LAST one)
I'm a beginner but the one you recommended to me has a Power Dissipation of 45 W, so 3 meters of the led strip I am planning to use consume 6 Amps 15 Watts (3x15=45W) does this mean that my mosfets are going to get to hot?
Should I choose a transistor with more Poer Dissipation?
This is maybe a silly question but I'm a begginer, SORRY!
Thank you very much!
The power that the strip dissipates is irrelevant. Is the power that the MOSFET dissipates that you would worry about. This is determined by the RdsOn figure (usually given in milliohms) and the current flowing through the MOSFET and led strip. P=IIR. Even then, you only get the quoted RdsOn value if the MOSFET is fully switched on.
This is maybe a silly question but I'm a begginer, SORRY!
there is no silly question, and you don't have to be sorry for being a beginner, but sometimes, doing some research by yourself can be helpful 
if you google "mosfet as a switch" , you'll find this (and much more)
and now, you'll understand what PaulRB just wrote (and BTW what Raschemmel wrote in answer #1 ]
That MOSFET has an RDS(ON) of 82 mohms , which means 6A will dissipate 3W in the device
, and you'll see that, for your case, with the IRLIZ44N
if the load needs 6A , the power in the mosfet will be P=RxI² = 0.022 x 6² = 0.022 x 36 = 0.792 -> 0.8W
"what raschemmel " politely" mentioned...." ;D
alnath:
there is no silly question, and you don't have to be sorry for being a beginner, but sometimes, doing some research by yourself can be helpful
if you google "mosfet as a switch" , you'll find this (and much more)and now, you'll understand what PaulRB just wrote (and BTW what Raschemmel wrote in answer #1 ] , and you'll see that, for your case, with the IRLIZ44N
- RDSon = 0.022 Ohm (when fully ON)
if the load needs 6A , the power in the mosfet will be P=RxI² = 0.022 x 6² = 0.022 x 36 = 0.792 -> 0.8W
Thank you very much ,now I get it !
if the load needs 6A , the power in the mosfet will be P=RxI² = 0.022 x 6² = 0.022 x 36 = 0.792 -> 0.8W
by way of a trivial aside, P=RxI² is usually represented as P=I² x R (obviously doesn't affect the outcome)
As a matter of fact, I've more often seen (and written) it as P=RI² or P=I²R . I added the 'x' sign and all the details to make things clear .
To find the Power (P)
[ P = V x I ] P (watts) = V (volts) x I (amps)
Also,[ P = V2 ÷ R ] P (watts) = V2 (volts) ÷ R (Ω)
Also,[ P = I2 x R ] P (watts) = I2 (amps) x R (Ω)
FROM HERE
Just to be fair:
raschemmel:
FROM HERE
If you know
P = VI
And can remember
V=IR
You can easily (in your sleep) sub in
P = (IR)I
P = I^2R
Sometimes its more useful to sub in
I = V/R
P = V(V/R)
P = V^2/R
Its bread and butter stuff
@Resonator,
Alnath and I were simply discussing WHICH form of the power formula is more common : "P= I^2R" or "P=RI^2"., NOT whether or not one could remember some formula. ,
" it's bread and butter stuff".
Really, ?
Thanks . ( like we didn't know that ?)
