defining in KiCad a NPTH hole in the form of a SOT123A flange

On Wed, Apr 30, 2014 at 05:02:10PM -0000, Nicolaas van Dijk wrote:
> In an RF board made in KiCad I have to define a hole where a BLW85 RF Power transistor fits. That hole must have the format of the flange of that transistor, a SOT123A. There should be no metalisation, so a NPTH hole. Round holes is no problem, but I could not find a way to define the patern for the flange. Anyone can help me?

General case:

If it's NPTH draw the hole on the PCB edges layer, with the line tool.
Too bad that at the moment it can't be done in the module editor, only
on the board itself.

The board fabricator will mill the area as an hole, check the minimum
distance they handle (usually is about 1mm, depends on the machine they
use).

In this particular case:

Since we are talking about a specific case (the oval flange of
a SOT123A), you can also use a pad with an oval hole (a slot) do fit the
flange in (I presume you want to directly reach some heat sink below the
board), in this way:

- Pad type NPTH
- Shape oval
- Drill Size X 25, size Y 6.6 (check the datasheet and take care of milling
  tolerances and so on, it's just a starting point)
- Size same as drill size
- Orientation 450, assuming you want 'straight' regular leads

This can be done on a module and goes in the drill file, not in the
board outline (it's usually easier to handle)

--
Lorenzo Marcantonio
Logos Srl

Thanks a lot Lorenzo.
I did draw in PCB edges. A small problem is that you only can draw lines at 0, 45 and 90 degrees, but that didn't give me a problem
Kind regards and many thanks for the help
Nico

On Thu, May 01, 2014 at 09:11:39AM -0000, Nicolaas van Dijk wrote:

> I did draw in PCB edges. A small problem is that you only can draw lines at 0, 45 and 90 degrees, but that didn't give me a problem

You can change that in the general options. There are two flags, one for
tracks and one for other lines.

--
Lorenzo Marcantonio
Logos Srl

Thanks Lorenzo
Regards
Nico

----- Original Message -----
From: "Lorenzo Marcantonio" <email address hidden>
To: <email address hidden>
Sent: Thursday, May 01, 2014 11:32 AM
Subject: Re: [Question #247940]: defining in KiCad a NPTH hole in the form
of a SOT123A flange

Your question #247940 on KiCad changed:
https://answers.launchpad.net/kicad/+question/247940

Lorenzo Marcantonio posted a new comment:
On Thu, May 01, 2014 at 09:11:39AM -0000, Nicolaas van Dijk wrote:

> I did draw in PCB edges. A small problem is that you only can draw
lines at 0, 45 and 90 degrees, but that didn't give me a problem

You can change that in the general options. There are two flags, one for
tracks and one for other lines.

--
Lorenzo Marcantonio
Logos Srl

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