FEDEVEL
Platform forum

Sakib816 , 09-07-2025, 03:42 PM

What parameters are important for selecting a MOSFET? For low-power, high-power, and for high-speed or low-speed applications? Are there any guidelines or documents available? Can anyone provide them?

QDrives , 09-07-2025, 03:50 PM

There are many parameters that are important... **depending on**...
And no, I cannot provide guidelines as it is not clear to what type and level you need them. You need to be specific for the application.

Robert Feranec , 09-08-2025, 04:25 AM

yes, depends on application. for example if you would like to use it as a simple switch, you may want to check the max current and voltage, but also gate voltage or the voltage drop. do you have any specific application in mind?

Sakib816 , 09-12-2025, 01:00 PM

For example , application like : BLDC motor drive (ESC application ) or where high switching needed , cost effective 🙂

QDrives , 09-12-2025, 02:08 PM

So 1V, 10V, 100V or 1000V?
0.1A, 1A, 10A, 100A or 1000A?
1Hz, 1kHz, 1MHz or 1GHz?
$0.01, $0.10, $1.00, $10.00 or $100.00?
You have MOSFETs for all these specs. But it will not be a single MOSFET that can do it all.
You can start here: https://www.youtube.com/watch?v=W50ib1MJ8T8

Sakib816 , 09-21-2025, 02:23 PM

so how i will determine the gate switching frequency ? like how i will determine how fast the mosfet will turn on and off ? is there any thumb rule or any equation ?

QDrives , 09-21-2025, 10:44 PM

The gate switching frequency depends on the thing that drives the gate eventually -- like the MCU.
As for the speed -- that also depends on what you take all into consideration like delays and rise time in the driver.
For the FET itself, a simple rule is to look at the (total) gate charge and then calculating how fast you can get that charge in/out.

Sakib816 , 09-22-2025, 02:51 PM

can you give me the formula or a calculation ?

QDrives , 09-24-2025, 02:36 PM

Q[C] = C[F] * dU[V]

QDrives , 09-24-2025, 02:36 PM

Q[C] = I[A] * t[s]

Sakib816 , 09-26-2025, 05:28 AM

kindly give me the calculation , for example

QDrives , 09-26-2025, 06:09 PM

https://www.youtube.com/watch?v=of_v2N5f788