IRFZ34N Transistor Datasheet, IRFZ34N Equivalent, PDF Data Sheets. MOSFET. Parameters and Characteristics. Electronic Component Catalog. IRFZ34N Infineon / IR MOSFET MOSFET, 55V, 26A, 40 mOhm, nC Qg, TO- AB datasheet, inventory, & pricing. Buy IRFZ34N N-Channel MOSFET Transistor, 29 A, 55 V HEXFET, 3-Pin IRFZ34N; Brand International Rectifier IRFZ34N Power MOSFET Data Sheet.

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I tried at reducing the resistor from 10K to Ohm.

IRFZ34N Hoja de datos ( Datasheet PDF ) – Power MOSFET

Here is the code, Code: Agree about the gate resistor. What I noticed is that when i disconnect the 19V supply, the serial monitor shows a steady 0 from the pot read from A0.

Triple check the wiring and post a circuit diagram hand drawn, not Fritzing. But the thermistor isnt turning off. The key specification is the value of Ifz34n quoted in the on-resistance section.

PDF IRFZ34N Datasheet ( Hoja de datos )

MarkT Brattain Member Irf34n As mentioned above, the schematic shows the MOSFET wired backwards, which can’t work the heater should be on all the time due to the body diode. Some people get confused by the threshold voltage – this is the voltage the device switches fully off, not on. I am PWMing the pin 3 of the nano. Please point out what you are calling a thermistor on your diagram. Ok, once again, thanks for helping out an electrically challenged person. I need dtaasheet study more.


Normally the on-voltage will be about 3 times the threshold voltage being the point the device switches fully off. So the heater can be on datasheer reset until the pin 3 pinMode is executed in setup. If you mean that the power resistor heater is not turning off, double check your wiring and the pinout of your MOSFET.

The thermistor 25W 5. I did connect a 10K from the gate to the ground.

If that is a problem, a 10K. But that didnt make a difference. I read serial values and can see that the pot is working. A thermistor is a type of variable resistor used to measure datashee. But when I connect the 19V, the values start floating wildly, and thats probably why the thermistor started smoking before I unplugged.

The test code I used is here. Is the attached looking any better? This is one of many useful ones.

IRFZ34N getting too hot. I am using the attached circuit to heat up the 3D printer bed.


It sends sine wave: A better choice would be more like ohms, high enough to limit current but low enough to charge the input capacitance quickly as possible. In between those two the device can be half-on, meaning it may dissipate lots of power and get very hot – the region of operation you want adtasheet avoid.

Attached is the new circuit just a variation to my irffz34n, this time using a pot. I measured a 2.

The behavior that you describe sounds like what jremington mentioned in reply 7. The gate resitor is way too high. Screen Shot at Also the sine irzf34n code is something I found out on one of the forums that was used to demo a bulb going dim and bright slowly.

Is your printer bed rotating?