Counterpart of the NPN transistor, this time, we show you a N Channel MOSFET, a power transistor. We also have the famous STP16NF06 (16A) on the shop but is't sometime not enough (mostly when the temperature is increasing.
The transistor IRF540NPBF does have a dispose Drain-Source resistor RDS(on) lower than 0.044 Ohms. This means that it can draw higher current while limitating the heat dissipation (which is critical when enlosing electronic in a box).
An another interesting point is the very low Gate Threasold Voltage (Vgs(th) fixed to 2.0V, so you can use it directly with a 5V microcontroler. You may have some results with a 3.3V device... but this will depend on the real VGs threasold of the transistor in you hand (this value may vary a bit from one transistor to another).
This VGs threasolt is closed of 2V this will work nicely with a 3.3V... if VGs Threasold is higher then the result may be unpredictable on 3.3V device.
Using N-Channel MOSFET is really common, they are widely used and internet does have a lot of free tutorial.
The IRF540N is a good challenger if the STP16NF06 are suffering... the MOSFET transistor are very popular in the maker's wolrd because it can drive a verrryyyy high current (very cool to drive strip leds and RGB led strip).
We suggest to use 100 KOhms resistors with this transistor (See the tutorial section)
- 2 x N-Channel MOSFET - IRF540NP
- Datasheet IRF540N.
- Drain Source Voltage Vdss: 100V
- On Resistance Rds(on): 44 mOhms
- Id = 33A
- Max Working temperature: 175°C
- Power dissipation Pd: 130W
- Rds(on) Test Voltage Vgs: 10V
- Threshold Voltage Vgs: 2V
- We have a french tutorial on "Motor Mini Kit for Hobby" which use the STP16NF06 (also a N-Channel MOSFET). You can replace the STP16NF06 by a FDP7030BL (same pinout) or a IRF540N (please check the pinout).
- You can also find a plenty of tutorials on IRF540N.
Good to know it!
- Cool down your transistors, they don't like the heat!
- The maximum current is 33Amp, it is a very high current. So cold down the transistor ;-)
- Using a High Frequeny signal to drive the transistor always cause a higher power dissipation.
So you should think to cold down your transistor!
- A PWM signal has an infinite frequency on the raising and falling edge of the signal. Indeed , the signal goes from 0 to 1 with no delay in between which result in a "infinite frequency".
No problem if it happens from time to time... but if you are driving your MOSFET with such signam (EG: PWM signal) then this will create a noticable heat dissipation.
Once again... cold down your transistor.
With PWM signal you will be able to modulate the power delivred by the transistor.