Pioneer PRS-D2000SPL (2SK3777)

[Troy Dionne]

Does anyone know a reliable source for the outputs in this PRS-D2000SPL? They are 2SK3777. Or maybe a suitible sub? I can't seem to find much on these FETs.

 

[steveu]

http://rtellason.com/transdata/2sk3777.pdf

IXTH54N30T IXYS | Mouser

Find A Sales Rep | Fuji Electric Corp. of America

Note that 2sk3779 is only 250V but 59A which may be better since 2KW in to 1 Ohm is only about 130V Rail-Rail. Indeed you may choose to replace them with the biggest (highest current) 150V FET you can find, but check the supply voltage first. I assume you have checked/replaced the drivers as well? BTW, this kind of power can make fiberglass PCBs into charcoal, which there is no fixing. You have to replace the PCB.

 

[Troy Dionne]

The PCB is fine, no damage at all.

I was considering using the IRFP4868. https://www.mouser.com/datasheet/2/196/Infineon-IRFP4868-DS-v01_02-EN-1227691.pdf

Any reason this wouldn't be suitible. I will have to add insulator to the heat sink since these arent fully encased packages, but that's not a big deal.

 

[Troy Dionne]

FDA59N30 Also seems like it would be suitible and is a lot more cost effective since I need to replace ALL of them.

 

[NadaD]

Dont forget, that these replacements have shorter legs than originals.

 

[steveu]

All good possibilities, but without the schematic and details like circuit voltages, it's hard to say. The Fairchild part has a higher gate threshold which would be good if the failure was shoot-through but bad if it was on resistance heating. The failed part specs claims no secondary breakdown but obviously it did fail, perhaps for other reasons. Does the product have over temperature shut-down, over-current protection and fuses the customer can't bypass?

 

[Troy Dionne]

It does have temp and over-current. Does not apparently have DC offset protection as it seemed plenty happy to have 120V DC offset and keep running no problem.