Can I test the nominal value of the MOSFET with one circuit?

Can such a circuit test the nominal withstand voltage and current value of the MOSFET by changing the power supply and load?

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Doesn't the data sheet givs you those values?

kmimax:
Can such a circuit test the nominal withstand voltage and current value of the MOSFET by changing the power supply and load?

No, you need a test circuit that supplies a fixed current to measure breakdown voltage, and the current
specification of a MOSFET is simply the package maximum power dissipation in disguise. If I-squared-R
loss in the MOSFET meets the package dissipation limit, that's the continuous current limit.

The peak pulsed current limit you'd need another test circuit for, and a supply of parts to burn up.

Easier to let the manufacturer do all this for you!

NO!!!! If you are that close get a different MOSFET. The testing you do will be good for one device and most of the time it is destructive although that may not immediately manifest itself.

The first thing you may want to do is learn to understand the datasheet published for the device. This is no easy task.

The semiconductor manufacturers spend millions of dollars to check and validate there parts. They have checked thousands upon thousands of parts to determine the ratings they will guarantee. They are all tested in the product process again to validate the parameters. Yes some will perform better but if the manufacturer is reputable they will all meet the published specification. They do not play the one upmanship as others have stated elsewhere. They sell these in the millions and cannot afford to get them back.
Good Luck, Have Fun
Gil