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Author Topic: Favourite Power MOSFET  (Read 1418 times)
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Sorry - book research again.

I have a favorite power MOSFET. The FQP33N10. They cost about 80p / $1 each, are ok for logic level switching and generally rock.

http://www.farnell.com/datasheets/104979.pdf

However, while Mouser and Digikey do sell them, they don't seem to be that commonly used in the US.

Any one got a nice logic level N-channel Power MOSFET recommendation?


 MOSFET, N, TO-220
 Continuous Drain Current Id: 33A
 Drain Source Voltage Vds: 100V
 On Resistance Rds(on): 52mohm
 Threshold Voltage Vgs Typ: 4V
 Power Dissipation Pd: 127W
 Current Id Max: 33A
 Pulse Current Idm: 132A
 
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http://www.ebay.com/itm/10-PCS-RFD3055LE-RFD3055-IC-BOX-86-/160768659447?pt=LH_DefaultDomain_0&hash=item256e8f0ff7

RFD3055LE


Drain to Source Voltage (Vdss)                -  60V
Current - Continuous Drain (Id) @ 25° C   -  11A
Rds On (Max) @ Id, Vgs                          - 107 mOhm @ 8A, 5V
Vgs(th) (Max) @ Id                                - 3V @ 250µA
Gate Charge (Qg) @ Vgs                         - 11.3nC @ 10V
Input Capacitance (Ciss) @ Vds                 - 350pF @ 25V
Power - Max                                         - 38W


I'm loving these for switching power LED's.  About forty cents each in ten quantity, including shipping.  Remind me to order some more next week, will ya?

I've run these pulling nearly 6A at 12v and they barely get warm.  At 2A, they don't even get above room temp.  I don't bother with a gate to source resistor, as I understand the internal resistance in the microcontroller is more than enough to discharge the gate (and I've had no problems with shutoff delay to indicate otherwise).  I was intimidated by MOSFETs far too long, these are easier to use and more efficient than any bipolar transistor.

Right now I have three of them on a vectorboard next to me, providing PWM for a five meter RGB LED strip light (24 watts per color), controlled by the arduino of course... they are also the MOSFET I am using for the LED flash.  Can't seem to find fault with them, even seem to be relatively static tolerant, to the point of a nice carpet-spark discharge to one I went to solder not causing any apparent harm.

I was previously a fan of Darlington NPN's for switching (like TIP120), and for low power I still will use ULN2003 line - can't beat them for ease of use.  However, for anything over a couple hundred milliamps... these here MOSFETs are the bee's knees.  If there's an equivalent MOSFET array to the ULN Darlington arrays, that would be perfection (assuming it also cost only a buck or so each, that is...)
« Last Edit: June 26, 2012, 10:45:05 am by focalist » Logged

When the testing is complete there will be... cake.

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Quote
RFD3055LE

You can't really argue with 20c a transistor!

Nice.
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Dangit, I couldn't make myself wait.  Just ordered another twenty of the suckers.  Seven dollars including shipping, and the last time I ordered them, they were here in three days.  They really seem to be a clearinghouse for bulk surplus parts, so I don't know how long their supply will last.  I've bought a couple of things from this vendor, and been really happy overall..

When run through Octopart I see prices ranging from 30 to 60 cents per unit, even that is a pretty good price.  (I only price out through hole.  I am still SMD phobic)
http://octopart.com/partsearch#search/requestData&q=RFD3055LE&start=0&sortby%5B%5D=avg_price&sortby%5B%5D=asc

This mean I get a signed copy of the new book?   smiley-mr-green
« Last Edit: June 26, 2012, 06:12:19 pm by focalist » Logged

When the testing is complete there will be... cake.

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@retrolefty has recommended one several times.  I'll see if I can find it...
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I think this is the one...
http://www.sparkfun.com/products/10213
http://www.sparkfun.com/datasheets/Components/General/RFP30N06LE.pdf
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IRF510, not sure why, might be because I bought hundred a few years ago.
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IRFB9N60A
4V operation and 9.5A
$2.52 each
Using them on an ATtiny2313 controlled Step/Direction Unipolar Stepper driver.
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IRLS3036-7PPbF  1.5mOhm typical at 10V, 1.7mOhm at 5V.  Continuous current package limited at 240A, pulsed current limit 1000A.  gate capacitance 11nF(!)  D2PAK with 6 legs.

Having said that I haven't found a use for it yet!
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IRLS3036-7PPbF  1.5mOhm typical at 10V, 1.7mOhm at 5V.  Continuous current package limited at 240A, pulsed current limit 1000A.  gate capacitance 11nF(!)  D2PAK with 6 legs.

Okay - $7.62 qty 1
But how do you hook up a surface mount device that size and then run 240 Amps through it???
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