40A 290V FETs? pc boards

[WindriderNM]

I have 20 of these they need a +/- 15 volt supply that I also have. I want to use some of them for a controller. I haven't been able to get a spec sheet for the FET's? I think that from the #s IXTM40N29 on them they are 40A 290V.The fuses are 25A. They are from a pulse generator. any ideas?

[joestue]

they are probably IGBTs.
can you identify if the gate drive is bypolar? if the gate is sucked down to -15 or even -5 during turn off they are most likely igbts. of course you can check the on resistance yourself without a lot of work.
the part number itself doesn't look like a typical fet part number but i can't find anything.
in any case, 4 of those would make a nice 6kw inverter.

[boB]

Not exactly the same but close maybe...    IXTM40N30

Parameter      IXTM40N30 
VDSS, Max, (V)      300 
ID(cont), TC=25°C, (A)      40 
RDS(on), Max, Tj=25°C, (Ohm)  0.085 


http://ixdev.ixys.com/DataSheet/91535.pdf