Help with MOSFET sub..

Dec 27, 2007 3 Replies
R

Hi there..



Sometime lurker first time poster.



I'm working on an older mid 90's vintage cnc motor controller board.



The magic smoke has been let out of several of the 2SK1277 MOSFETs on this board along with the IR2110 high/low controllers.



The problem I'm having is finding a suitable substitute for the



2SK1277. I've found some IR2110 ICs, but cannot find any of the
2SK1277.

In all honesty I'm not that great at this stuff, although I do manage to get most of the stuff working I attempt to repair. What I'm looking for is some help in determining a good sub for the MOSFET I need. One caveat, it does need to be in a TO-3P package due to how the board/ heatsink combo is built.



Data sheet for the 2SK1277 is here: http://www.ortodoxism.ro/datasheets/fuji/2SK1277.pdf



A possible replacement that may or may not work (help!) is here:

formatting link



Thank you for any help! :) Michael


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W

I also have the same problem when I need to replace switching PS transistor. My solution is rather simple :

- the substitute must have Vgs treshold = original Vgs treshold

- the substitute must have Vds max >= orig- the substitute must have package = original package

Wicaks> Hi there..

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R

Okay, here is what I have found.

The original datasheet is here: http://www.ortodoxism.ro/datasheets/fuji/2SK1277.pdf

I have found this Fairchild part which appears to be even better than the original.

formatting link

Please take a look and let me know what you think and if I've missed anything.

Thanks, Michael

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W

Well, after I compared parameter in the datasheet :

- Vgs treshold of FQ =3D Vgs treshold of 2SK

- Vds max of FQ =3D Vds max of 2SK

- Id max of FQ > Id max of 2SK

- package of FQ =3D package of 2SK it can be concluded that FQ can replace 2SK. So, go ahead and replace it !

Wicaks> =A0Okay, here is what I have found.

/2SK1277.pdf

.

on

ge

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