[TriEmbed] Recommended SMD Logic-Level MOSFETs for prototyping

[Shane Trent]

Pete,

I like the board. I think a library of helper boards could be helpful for
prototyping. The engineers at Pololu have the best examples I have seen for
high-current PCB layout with surface mount MOSFETS. This board uses SOIC8
transistors in a motor driver H-bridge rated for 18 volts and 15 amps. I
like their multipurpose details on the high-current terminals. They use all
the copper they can for the terminal pads while allowing the use of screw
terminals or direct soldering of two different sizes of wire. Beautiful
design.

https://www.pololu.com/product/755
Top image - https://www.pololu.com/picture/view/0J1025
Bottom image  - https://www.pololu.com/picture/view/0J1026

Shane

On Tue, Jun 23, 2015 at 1:45 PM, Pete Soper via TriEmbed <
triembed at triembed.org> wrote:

>  Great writeup.
> I found myself searching for "beefy breakouts" for SOIC-8 packages and
> couldn't find one. I just knocked this out in Eagle and would like comments
> or criticism:
>
>   http://triembed.org/images/b1.png
>
> (the Eagle files are the same URL but ending FAT-SOIC8.{brd,sch})
>
> This is a dead-simple board except there are redundant traces on the
> bottom to vias that are in turn connected to the chip pads. So there are
> two .024" traces for each pin. The vias have relatively large holes I
> guestimate to have a circumference three times the trace width.
>
> The biggest question is whether this is redundant. If there's an
> unburdened Eagle file out there that I could upload to OSHPark I might be
> able to get some boards made in time for the next meeting. This board would
> cost 47 cents. But the boards I've found so far online have laughably
> narrow traces for multiple amps.
>
> I notice that the N channel chip you point to can handle pulses over 100
> amperes. Wow.
>
> -Pete
> PS Is just crazy some times. A fraction of the time it flagged net
> connections when I added wires from the via chip pads or else refused to
> acknowledge the connection. So I'm only 92% sure there would be copper in
> some cases and the first version of this board might really only have
> single traces for some of the pins.
>
>
> On 06/23/2015 11:22 AM, Shane Trent via TriEmbed wrote:
>
> Someone else asked for recommendations on logic-level MOSFETs so I wrote
> it up as a blog post.
>
>
> http://fettricks.blogspot.com/2015/06/prototype-friendly-smd-logic-level.html
>
>
>  Shane
>
>  --
>  A blog about some of my projects.  http://fettricks.blogspot.com/
>
>
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-- 
A blog about some of my projects.  http://fettricks.blogspot.com/
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