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'[EE] Jellybean P-channel SOT-23 for 3V?'
2009\06\03@141253 by Mark Rages

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I need a P-channel to switch a ~20 mA load.   System supply voltage is 3V.

Good ol' BSS84 has a threshold voltage of up to 2V,  and looking at
the curves it looks like it might not switch hard enough with 3V
drive.

What part are people using for this?  I prefer to spec cheap, common parts.

(A saturated PNP would work, but I need to watch quiescent current in
this battery-powered application.)

Regards,
Mark
markrages@gmail
--
Mark Rages, Engineer
Midwest Telecine LLC
spam_OUTmarkragesTakeThisOuTspammidwesttelecine.com

2009\06\03@143830 by Isaac Marino Bavaresco

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Mark Rages escreveu:
> I need a P-channel to switch a ~20 mA load.   System supply voltage is 3V.
>
> Good ol' BSS84 has a threshold voltage of up to 2V,  and looking at
> the curves it looks like it might not switch hard enough with 3V
> drive.
>
> What part are people using for this?  I prefer to spec cheap, common parts.
>
> (A saturated PNP would work, but I need to watch quiescent current in
> this battery-powered application.)
>
> Regards,
> Mark
> markrages@gmail
>  

What MCU are you using?

Many PICs can supply up to 25mA per output pin.

Regards,

Isaac

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2009\06\03@150605 by Mike Harrison

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On Wed, 03 Jun 2009 15:38:25 -0300, you wrote:

{Quote hidden}

At 3V you will probably get a noticeable voltage drop though. If you can low-side switch  PIC O/P or
N-Fet) , you'll get less drop at lower supplies.

I tend to use Zetex ZXM61P/N02 or 03 as a general-purpose small FET - very fast and can take about
an amp (as long as you switch it nice & quick, before it pops!)

2009\06\03@154345 by Mark Rages

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On Wed, Jun 3, 2009 at 2:06 PM, Mike Harrison <.....mikeKILLspamspam@spam@whitewing.co.uk> wrote:
{Quote hidden}

I'm using an MSP430 (I could use something else I guess -- no firmware
written yet.)  MSP430 has less output drive than PIC.

Mike, I was looking at that Zetex part.  It's more expensive than I
expected, about $0.20 in 1k.  I guess that's cheap enough though.

Regards,
Mark
markrages@gmail
--
Mark Rages, Engineer
Midwest Telecine LLC
markragesspamKILLspammidwesttelecine.com

2009\06\03@155611 by Bob Blick

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On Wed, 3 Jun 2009 13:12:52 -0500, "Mark Rages" <.....markragesKILLspamspam.....gmail.com>
said:
> I need a P-channel to switch a ~20 mA load.   System supply voltage is
> 3V.
>
> Good ol' BSS84 has a threshold voltage of up to 2V,  and looking at
> the curves it looks like it might not switch hard enough with 3V
> drive.
>
> What part are people using for this?  I prefer to spec cheap, common
> parts.

Fairchild NDS336P might be a bit overkill but it is a good part and
threshold voltage is under a volt.

Cheers,

Bob

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2009\06\03@155632 by Bob Blick

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I should have looked first, the new part number is FDN336P.

Cheers,

Bob

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2009\06\03@163220 by Mark Rages

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On Wed, Jun 3, 2009 at 2:56 PM, Bob Blick <EraseMEbobblickspam_OUTspamTakeThisOuTftml.net> wrote:
> I should have looked first, the new part number is FDN336P.
>

Excellent.  Thanks, Bob.

Regards,
Mark
markrages@gmail
--
Mark Rages, Engineer
Midwest Telecine LLC
markragesspamspam_OUTmidwesttelecine.com

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