Porter Cable 851 Driver/Drill part 698955 FET?

[BoyntonStu]

Porter Cable 851 Driver/Drill part 698955 FET?

Do you know what the FET actually is?

I need to replace it.

The part is in a TO220 package and the 3 terminals are G D S.

Porter cable describes it as an FET

It is a 12 Volt tool's variable speed control trigger that is
connected to this component.

Could it be a 7812 (7815)?

What part would you recommend as a replacement?

 

[Phil Allison]

"BoyntonStu"

Porter Cable 851 Driver/Drill part 698955 FET?

Do you know what the FET actually is?

I need to replace it.

The part is in a TO220 package and the 3 terminals are G D S.

Porter cable describes it as an FET

It is a 12 Volt tool's variable speed control trigger that is
connected to this component.

Could it be a 7812 (7815)?

** LOL - no way.

What part would you recommend as a replacement?

** It's almost certainly an N channel power mosfet .

There are lots of possible replacements.

Needs to have at least a 30 volt rating and a low resistance - like 0.01
ohms.

Current rating needs to be 50 amps or more.

An " IRFZ48VPBF " is good candidate.

Unless the beastie is a logic level FET.




....... Phil

 

[John Smith]

"BoyntonStu"



** LOL - no way.




** It's almost certainly an N channel power mosfet .

There are lots of possible replacements.

Needs to have at least a 30 volt rating and a low resistance - like 0.01
ohms.

Current rating needs to be 50 amps or more.

An " IRFZ48VPBF " is good candidate.

Unless the beastie is a logic level FET.




...... Phil

Actually, why couldn't it, and you vary the "reference voltage" to the
voltage regulator to "trick" it into becoming a "current regulator?"

I can picture a circuit which could be used ...

Regards,
JS

 

[John Smith]

...
Actually, why couldn't it, and you vary the "reference voltage" to the
voltage regulator to "trick" it into becoming a "current regulator?"

I can picture a circuit which could be used ...

Regards,
JS

Well, basically, it could be done ... however, I "over read" this too
quickly, the original poster negates some of what I advanced--only I
should have read his/her words closer ... sorry.

Regards,
JS

 

[BoyntonStu]

"BoyntonStu"








** LOL - no way.


** It's almost certainly an N channel power mosfet .

There are lots of possible replacements.

Needs to have at least a 30 volt rating and a low resistance - like 0.01
ohms.

Current rating needs to be 50 amps or more.

An " IRFZ48VPBF " is good candidate.

Unless the beastie is a logic level FET.

...... Phil

Phil or anyone,

Do you have a spare one that I can buy if I send you a SASE?

Thanks,

BoyntonStu

 

[BobG]

Do you have a spare one that I can buy if I send you a SASE?

=====================================
Spend some time browsing digikey or mouser... you know you need To220
and 50A, see what they have, how much they cost etc.

 

[Joel Koltner]

Actually, why couldn't it, and you vary the "reference voltage" to the
voltage regulator to "trick" it into becoming a "current regulator?"

Because a 7812 is still a linear regulator, and I've never seen a
variable-speed drive on a cordless power tool that uses such a wasteful (in
terms of energy) technique; it just wouldn't make sense to turn, e.g., half of
your energy into heat when you want to drill at half speed (give or take).

 

[BoyntonStu]

=====================================
Spend some time browsing digikey or mouser... you know you need To220
and 50A, see what they have, how much they cost etc.

Would these do?

NEW 10pcs International Rectifier N- HEXFET Power MOSFET IRFZ48V
60V, 150W, 72A, pulse current 290A, TO-220AB package
Ultra low on residence,maximum 0.012ohm resistance,
More information on IRFZ48V use the link

http://www.irf.com/product-info/datasheets/data/irfz48v.pdf

I really do not need 5 for an old tool.

It is just an experiment.

Any gathering dust?

 

[James Beck]

Would these do?

NEW 10pcs International Rectifier N- HEXFET Power MOSFET IRFZ48V
60V, 150W, 72A, pulse current 290A, TO-220AB package
Ultra low on residence,maximum 0.012ohm resistance,
More information on IRFZ48V use the link

http://www.irf.com/product-info/datasheets/data/irfz48v.pdf

I really do not need 5 for an old tool.

It is just an experiment.

Any gathering dust?

I have a pile of :
IRF1010E 60V 200W 84A 330APeak 12mOhm
IRF3205 55V 200W 80A 390APeak 8mOhm
IRL2203N 30V 180W 82A 400APeak 7mOhm

All in TO-220 package.
You are welcome to 5 of your choice.
An address gets 'em thrown in an envelope.
We used them in some PWM speed controls and now they are just gathering
dust while waiting to be used in repairs.

Jim