[Lab] Mosfets

Richard Guy Briggs rgb at tricolour.net
Thu Nov 15 21:33:08 EST 2012

On Thu, Nov 15, 2012 at 08:44:58PM -0500, Bruce Harding wrote:
> Will this https://www.adafruit.com/products/355 mosfet, work this same as a 
> IRF520 mosfet?

That all depends on your application.

part	IRLB8721	IRF520
Vmax	30V		100V
Imax	60A		10A
Rds	0.009 ohms	0.27 ohms

If you are doing low voltage switching (under 30V) the adafruit part will
perform better.  If it is over 30V, but under 100V, the latter will be a better

That Adafruit part has a really low on resistance, which is good, meaning it
can operate without a heat sink for many uses where the latter part could not.

I'm currently staring at 7 IRFP254 power mosfets, 250v, 23A, 0.14 ohm on my
desk...  which are much higher voltage rating than the two you've listed, but
are somewhere in the middle in terms of switching capability in amps and on
resistance (which determines how much current they can carry without
overheating).  They are a larger package (TO-247AC) than the TO-220 package for
your two.

> Bruce Harding

	slainte mhath, RGB

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