[TriEmbed] Recommended non-SMT Logic-Level MOSFETs for prototyping

Tue Jun 23 14:10:04 CDT 2015

Martin,

The Digikey search engine points to this as the lowest Rds (100 mOhm at
Fgs=5V) N-FET in a 4-pin DIP package ($1 for 1). At the rated 2.5 amps it
would be dissipating 0.63 Watts which sounds like a challenge on a
breadboard but feasible on a PCB with some extra copper for spreading the
heat.
http://www.digikey.com/product-detail/en/IRLD024PBF/IRLD024PBF-ND/812492

You can use TO-220 or other SIP type packages on a breadboard. The Digikey
search engine found this TO-251A 30V N-FET with an Rds of 3.2 mOhms at
Vgs=4.5V, $0.81 for 1. The power dissipation should be very low until you
have well exceeded the current carrying capacity of your breadboard (0.08W
at 5 amps).
http://www.digikey.com/product-detail/en/AOI510/785-1487-1-ND/3603498

Super low Rds in through-hole P-FET is much tougher. They get pricey fast.
This is the best bang for the buck P-FET I could find, -30V part, Rds = 10
mOhms at Vgs=-5V, $2.90 for 1. (0.25 Watts at 5 amps).
http://www.digikey.com/product-detail/en/SUP53P06-20-E3/SUP53P06-20-E3-ND/2623103

Generally at TO-220 can dissipate around 1W without a heat-sink in free-air
without damage.

Shane

On Tue, Jun 23, 2015 at 2:12 PM, Martin Brooke via TriEmbed <
triembed at triembed.org> wrote:

> I would like your thoughts on *non-SMT* Logic Level MOSFETs that can
> plug into a protoboard.
>
> I have been using:
>
> NMOS  IRL2703PBF
> <http://www.digikey.com/product-detail/en/IRL2703PBF/IRL2703PBF-ND/811700>
>   $1.74 for 1 and
> PMOS IRLIB9343PBF
> <http://www.digikey.com/product-search/en?vendor=0&keywords=IRLIB9343PBF>
>  $1.37 for 1, they are quite similar in performance.
>
> These will fit (with a shove) in a regular protoboard and can carry a lot
> of current .  So they have been sort of a work horse for just boosting a
> microcontrollers switching capability to drive a motor
> or other high current device quickly.
>
> But is seems there should be better devices.  The above devices tend to
> be overkill in current and a 4-DIP or 6-DIP package would be much nicer.
> But everything I have found had too high a threshold voltage PMOS for logic
> control. I would like a similar NMOS and PMOS at least for threshold
> voltage magnitude (around 1-2V) and package type.
>  If I could find some around 100mA to 1A it would be ideal I think.
>
> I found this nice 4-DIP NMOS 
> IRLD120PBF
> <http://www.digikey.com/product-detail/en/IRLD120PBF/IRLD120PBF-ND/812490>
> , for $.76 and w
> e have been using this similar 4-DIP NMOS
> IRLD014PBF
> <http://www.digikey.com/product-detail/en/IRLD014PBF/IRLD014PBF-ND/812481>
>  for $.92 for a few years, I just wish there was a PMOS like them.
> 
> 
> This pair of NMOS and PMOS in a 8-DIP ALD1115PAL
> <http://www.digikey.com/product-detail/en/ALD1115PAL/1014-1044-ND/2414320> for
>  $2.02 looks OK but they are too low current (few mA) to be useful.
>
> Not interested in BJTs for this.  Hard to beat a MOSFET for simplicity
> of drive and you can put them in parallel without resistor degeneration.
>
>
> Cheers,
>
>
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>
>

-- 
A blog about some of my projects.  http://fettricks.blogspot.com/
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