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Old 20th October 2014, 07:18 AM   #1
Vasquo is offline Vasquo  United States
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Default Mosfet in TO-3 package

Is there a MOSFET part# (equivalent to IRFP240, IRFP9240) in TO-3 package?
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Old 20th October 2014, 07:36 AM   #2
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The obvious answer would be the IRF240 and IRF9240 (the TO-3 parents of the IRFP TO-247 parts), but they'll be hard to find/quite possibly faked.
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Old 20th October 2014, 11:06 AM   #3
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ask there:
Magnatec. ALFET Lateral MOSFETs
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Old 20th October 2014, 11:41 AM   #4
JMFahey is offline JMFahey  Argentina
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Sorry but no.
IRF(P)240/9240 are vertical/switching MosFet ; the Magnatecs are Lateral/audio types.

Very different, specially the biasing voltage.

Direct substitution will not work.

May I ask what does Vasquo need them for?
Maybe others can be used or the easy to find plastics fit there.
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Old 20th October 2014, 11:59 AM   #5
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Quote:
Originally Posted by JMFahey View Post
Sorry but no.
IRF(P)240/9240 are vertical/switching MosFet ; the Magnatecs are Lateral/audio types.

Very different, specially the biasing voltage.

Direct substitution will not work.

May I ask what does Vasquo need them for?
Maybe others can be used or the easy to find plastics fit there.
This I know all. Therefore I write "ask there". This means, a call to this company clarify, whether there are replacements available or not for the IRF240/9240 in TO 3 outline.
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Old 20th October 2014, 05:29 PM   #6
llwhtt is offline llwhtt  United States
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Newark has IRF240s in stock now and IRF9240s due in December, Newark "should" be trustworthy.

Craig
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Old 20th October 2014, 06:44 PM   #7
Vasquo is offline Vasquo  United States
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Quote:
Originally Posted by JMFahey View Post
Sorry but no.
IRF(P)240/9240 are vertical/switching MosFet ; the Magnatecs are Lateral/audio types.

Very different, specially the biasing voltage.

Direct substitution will not work.

May I ask what does Vasquo need them for?
Maybe others can be used or the easy to find plastics fit there.
JM, this is for the amplifier schematic in the LME49830 datasheet.

Well, I'm a little surprise the TO-3 package is only 125W Pd vs (150Watt Pd on the TO-247 package), I thought the TO-3 package will have a higher Pd.
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Old 20th October 2014, 07:47 PM   #8
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For a reasonable heat sink without fan or liquid augmentation, I would not allow more than about 30W dissipation per package. The 125/150W numbers are kinda bogus, as they assume a perfect heat sink and unacceptable temperature for the die inside the package. A TJ of 100C or so at max dissipation and max ambient temperature is a generally accepted limit for silicon devices.
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Old 20th October 2014, 08:48 PM   #9
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by Vasquo View Post
JM, this is for the amplifier schematic in the LME49830 datasheet.

Well, I'm a little surprise the TO-3 package is only 125W Pd vs (150Watt Pd on the TO-247 package), I thought the TO-3 package will have a higher Pd.
Well, that datasheet clearly specifies IRFP parts, I'm baffled as to why you would want the TO3 ones , which by the way if ever existed are obsolete (so unobtanium/ultra expensive/etc.)

I thought you were repairing some old amp with heatsinks which only accept TO3 .

EDIT: as of dissipation, I am not surprised at all, TO3 is steel (worse conductor) while all of TO247 back is (tinned) pure copper.

Last edited by JMFahey; 20th October 2014 at 08:50 PM.
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Old 20th October 2014, 08:57 PM   #10
Vasquo is offline Vasquo  United States
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I just like the look of a TO-3 package. but yes, found some online and they're 4x cost as much. Looks like I'm back to the TO247 package.
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