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Old 26th September 2003, 05:54 PM   #1
Apogee is offline Apogee  United States
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Question Irfp244B

Am about ready to order my fets and found this on Fairchild's site...

http://www.fairchildsemi.com/pf/IR/IRFP244B.html

Would these be better or worse than standard IRFP244's? Anyone know what the difference is in the "B" model?

Also, does anyone know of a reasonable source for IRF244's in TO3 cases? The vendors that I've tried all want ~$7.50 each for these. I'm figuring that I'll have to buy ~300 to end up with 4 sets of 16 and 4 sets of 12 that are matched...

I really wanted to use the TO3 style devices because the "scrap" metal that I have is already drilled for them but the pricing is just brutal!!!

Any chance Pass Labs would consider selling 112 devices that are matched?

Help!

Thanks
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Old 26th September 2003, 07:17 PM   #2
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IRFP244 is in TO247AC packaqe - IRFP244B is in TO3P.

Difference in absolute maximum ratings is minimal and IMHO of no importance.

I heard that IR now belongs to Fairchild. Maybe IRFP244B is manufactured by IR under the Fairchild logo in just a different package.

Nick
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Old 27th September 2003, 02:50 PM   #3
uli is offline uli  Austria
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Default TO3P

Folks be careful!
TO-3P is nearly the same plastic case as TO247
NOT compatible to normal TO-3!!!

Uli
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Old 27th September 2003, 03:33 PM   #4
BrianGT is offline BrianGT  United States
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TO-3P is a good deal bigger then the TO-247AC, but still the same plastic package. I don't like them only because I can't find any large insulators meant for the package.

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Old 27th September 2003, 03:42 PM   #5
uli is offline uli  Austria
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Quote:
Originally posted by BrianGT
TO-3P is a good deal bigger then the TO-247AC
Brian
I fear that is not quite correct:

TO3P:
15,6 x 19,9 x 4,8 mm

TO247:
15,9 x 20,3 x 4,7-5,1 mm

Uli
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Old 27th September 2003, 03:47 PM   #6
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by uli


I fear that is not quite correct:

TO3P:
15,6 x 19,9 x 4,8 mm

TO247:
15,9 x 20,3 x 4,7-5,1 mm

Uli
Well, I guess it depends on the part. I have some MJL1302A/3281 devices, which were classified as TO-3P, and they are a good deal larger then my IRFP240 TO-247AC devices.

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Old 27th September 2003, 03:51 PM   #7
uli is offline uli  Austria
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Default cases

Hi Brian,

there are some different versions of TO3P(+suffix) on the
market but the above dimension data is true for IRFP250
by IR and IRF250B by Fairchild.

You can consider them to be nearly identical except the
mounting hole which is isolated from drain at TO247!

Uli
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