MOSFET substitution

E

enkidu

Guest
I want to build a switching power supply that calls for an IRF420
MOSFET, which looks like its really hard to get a hold of....

http://www.semi-tech-inc.com/view.php?Prod_Type=STM420

If anyone has some time to take a look, could I substitute this?

http://rocky.digikey.com/WebLib/Panasonic/Web%20data/2SK3045.pdf

As far as I can see, its the same only better spec'd, but I want to be
sure before I play around with high voltage!

Thanks!

Michael
 
enkidu wrote:
I want to build a switching power supply that calls for an IRF420
MOSFET, which looks like its really hard to get a hold of....

http://www.semi-tech-inc.com/view.php?Prod_Type=STM420

If anyone has some time to take a look, could I substitute this?

http://rocky.digikey.com/WebLib/Panasonic/Web%20data/2SK3045.pdf

As far as I can see, its the same only better spec'd, but I want to be
sure before I play around with high voltage!

Thanks!

Michael
Click to expand...
It looks pretty close. It has a bit higher on resistance, so it is no
bigger but this should mean that the gate capacitance is not
significantly higher, either.
You might look at this plastic power tab version of the IRF420 (at
least to see a better list of specs):

http://www.irf.com/product-info/datasheets/data/irfr420.pdf

--
John Popelish
 
Thanks for the link, I didnt know about the irfr420 and irfu420..... and
Digikey even has them in stock :)

Michael
 
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