Irfp244B

Apogee · 26th September 2003, 05:54 PM

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

Nickolas K. · 26th September 2003, 07:17 PM

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

uli · 27th September 2003, 02:50 PM

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

Uli

BrianGT · 27th September 2003, 03:33 PM

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.

--
Brian

uli · 27th September 2003, 03:42 PM

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

BrianGT · 27th September 2003, 03:47 PM

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.

--
Brian

uli · 27th September 2003, 03:51 PM

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

26th September 2003, 05:54 PM	#1
Apogee diyAudio Member Join Date: Feb 2002 Location: Tacoma, WA	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 __________________ "If I had my life to live over again, I would have made a rule to read some poetry and listen to some music at least once a week." - Charles Darwin

27th September 2003, 02:50 PM	#3
uli diyAudio Member Join Date: Dec 2002 Location: Vienna, Austria	TO3P Folks be careful! TO-3P is nearly the same plastic case as TO247 NOT compatible to normal TO-3!!! Uli __________________ 'Jazz is not dead, it just smells funny' F.Zappa

27th September 2003, 03:51 PM	#7
uli diyAudio Member Join Date: Dec 2002 Location: Vienna, Austria	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 __________________ 'Jazz is not dead, it just smells funny' F.Zappa

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26th September 2003, 07:17 PM	#2
Nickolas K. diyAudio Member Join Date: Apr 2002 Location: Athens	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

27th September 2003, 03:33 PM	#4
BrianGT diyAudio Moderator Emeritus Join Date: Jan 2002 Location: near Atlanta, GA	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. -- Brian

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