irf510/9510 or irf530/9530

[LoveVirus]

I want an amplifier, and now candidates are irf510/9510, irf530/9530, one is the capacitor current is also small, but small, one large capacitor current is also large, with tl072q driver, who can give me advice?

[LoveVirus]

Sadly,no one answer to me?

[Workhorse]

You are lacking many basic concepts, So Sad, that you haven't done your home work yet and came around asking improper questions.

[CBS240]

What pwr into what load Z? would be a good start.

[ontoaba]

Do you need it with large capacitor and small capacitor, the small capacitor will be around the driver.

[AndrewT]

this might be for a headphone amplifier, or possibly for a line driver.

[winhill2]

To my mind a common big issue for using mosfets in linear amplifiers is heat conduction, and large-die parts have lower thermal resistance to the heat sink. That would speak for the '530 rather '510 parts. Compare the capacitance, Ciss = 180 or 670pF, that's proportional to area and hence heat conduction. Yep, we see 3.5 vs 1.7 deg-C/watt junction-to-case thermal resistance for the original IR510 vs IR530.

[CBS240]

Well, in addition to heat another issue is transconductance. 2 Semens is not much for an output device unless they employ higher voltage so as many can be paralelled. A look at the SOA graphs shows you Rds becomes an issue Vds<5V. I supose the 510s could be used for a power amp, but so could a thousand TO-92 J-fets. Without knowing the indended goals of the circuit we are all just generalizing and guessing.