Do either of these look suitable to replace the P-channel FX50SMJ-2 ?:
http://www.fairchildsemi.com/ds/FQ/FQA47P06.pdf
http://www.fairchildsemi.com/ds/FQ/FQA36P15.pdf
Is this the replacement you found for the FS70SMJ-2 ?:
http://www.fairchildsemi.com/ds/FQ/FQA70N10.pdf
http://www.fairchildsemi.com/ds/FQ/FQA47P06.pdf
http://www.fairchildsemi.com/ds/FQ/FQA36P15.pdf
Is this the replacement you found for the FS70SMJ-2 ?:
http://www.fairchildsemi.com/ds/FQ/FQA70N10.pdf
The 36P15 can't handle as much current but it should survive. It really depends on how abusive the owner is.
The low voltage transistor probably wouldn't survive. The amp is supposed to have ±55v on the rails in high voltage mode. The output configuration (cascode) will divide the voltage across the outputs but it will not divide it evenly so one of the P-channel outputs will almost certainly see more than its rated voltage.
Yes, that's the sub for the N-channel.
The low voltage transistor probably wouldn't survive. The amp is supposed to have ±55v on the rails in high voltage mode. The output configuration (cascode) will divide the voltage across the outputs but it will not divide it evenly so one of the P-channel outputs will almost certainly see more than its rated voltage.
Yes, that's the sub for the N-channel.
Perry, do you think the FS70SMJ can be substituted with
IRFP054N
http://www.reichelt.de/index.html?&ACTION=7&LA=3&OPEN=0&INDEX=0&FILENAME=A100%252FIRFP054N_IR.pdf
IRFP054N
http://www.reichelt.de/index.html?&ACTION=7&LA=3&OPEN=0&INDEX=0&FILENAME=A100%252FIRFP054N_IR.pdf
i don't think FQA36P15 could be a good replacement for FX50SMJ : HTTP 301 This page has been moved
those have too many capacitance/electrical differences.
i have bought some of this and work very well at reasonable price :RENESAS FX50SMJ 2 to 3P High Speed Switching Use | eBay
those have too many capacitance/electrical differences.
i have bought some of this and work very well at reasonable price :RENESAS FX50SMJ 2 to 3P High Speed Switching Use | eBay
I'd be interested in seeing the guts of an old, original FS70 that was installed by sony and one of the ebay transistors. Many times, the ebay versions of hard-to-find transistors are low quality parts that work reasonably well but cannot handle the full power/current of the originals. Generally,, the silicone die is much smaller. Sometimes there are multiple smaller dies to help boost the current capacity.
Something I didn't notice earlier is that the original is a 4v drive. The standard FET requires a higher drive (10v is commonly used). The 4v drive circuit may need to be modified to use with other FETs.
The following site has a few of the original part in stock. I've had good luck dealing with B&D but even reputable distributors can get fooled into buying counterfeit parts.
FS70SMJ-2 - Mitsubishi - FS70SMJ2 - datasheet
B+D Enterprises - Search results for: 'FS70SMJ-2'
Something I didn't notice earlier is that the original is a 4v drive. The standard FET requires a higher drive (10v is commonly used). The 4v drive circuit may need to be modified to use with other FETs.
The following site has a few of the original part in stock. I've had good luck dealing with B&D but even reputable distributors can get fooled into buying counterfeit parts.
FS70SMJ-2 - Mitsubishi - FS70SMJ2 - datasheet
B+D Enterprises - Search results for: 'FS70SMJ-2'
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