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Old 12th April 2008, 12:13 AM   #1
shagone is offline shagone  United States
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Question Sony XM-2252HX

Has anyone ever found a reasonably priced source for output fets in a Sony XM-2252HX ??? i know the original mitsubishi parts are very pricey last i checked. anyone know of a reliable substitute. i'll post the original part number when i get a chance.
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Old 12th April 2008, 01:36 AM   #2
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Fairchild crosses the N-channel but doesn't have a 100v P-channel to replace the original. The datasheets are available for the orginals so you should be able to find a suitable replacement.

Original numbers:
FX50SMJ-2 -100v -50 amps TO-3P
FS70SMJ-2 100v 70 amps TO-3P
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Old 15th April 2008, 12:39 AM   #3
shagone is offline shagone  United States
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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
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Old 15th April 2008, 01:00 AM   #4
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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.
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Old 15th April 2008, 03:37 AM   #5
jol50 is offline jol50  United States
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Are those the same mitubishi in the XM-7527? One sony I put IRFZ44 in the PS and they wanted $15 each for the original fets (+shipping!). I believe they do not come with included lubricant.
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Old 15th April 2008, 03:47 AM   #6
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The 7527 uses the same outputs.
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Old 27th March 2014, 09:59 AM   #7
sdoom is offline sdoom  Germany
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Perry, do you think the FS70SMJ can be substituted with

IRFP054N

http://www.reichelt.de/index.html?&A...RFP054N_IR.pdf
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Old 27th March 2014, 10:53 AM   #8
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I don't know but if you find a replacement, it will probably be good news for a lot of the collectors of Sony amps.

If you try them, test the amp thoroughly. That includes testing for bias hold through the entire thermal operating range.
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Old 27th March 2014, 03:57 PM   #9
tiomilo is offline tiomilo  Costa Rica
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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
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Old 27th March 2014, 04:22 PM   #10
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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'
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