Electronics > Beginners

What to look when looking for a FET or MOSFET equivalent

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gkmaia:
What are the key ratings to consider when replacing a FET or MOSFET for and equivalent apart from voltage and current ratings?

magic:
SOA, threshold voltage, RDS(on), gate charge, zillion of things...

What kind of application, what kind of FET?

gkmaia:
I suspected you could look at a zillion things, but if you were to simplify these zillion things to a couple that are the most critical ones apart from voltage and current what would those be?

Circlotron:
The most critical things vary, depending on the application. If you tell us the application we can narrow things down a *lot*.

aheid:
You can simplify somewhat but it is highly dependent on application. Attributes which are important in some applications can lead to detrimental aspects for another application. For example a good switching MOSFET typically won't work well in the linear regime. IIRC high voltage tolerance leads to higher capacitance, which is very bad for other applications.

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