kicad-developers team mailing list archive

[Jean-Paul Louis <louijp@xxxxxxxxx>]

The double diodes in SOT23 packages are really confusing since there are several configurations possible,
and they are all existing.
Pin
 1       2       3				-----------	Pin 1
A1, C1A2, C2              Pin 2    SOT23
C1, A1C2, A2				-----------	Pin 3
A1, C1C2, A2
C1, A1A2, C2

That is what I use as pin naming convention for the schematic.

Jean-Paul (AC9GH)



On Apr 4, 2014, at 8:16 PM, Dick Hollenbeck <dick@xxxxxxxxxxx> wrote:

> I am just doing 2 pin diodes, since they are easily confused orientation-wise.  They have cathode silkscreen markings, so I went with pad names A&C.
> The netlist reads better too, on the rare moment a human has to look at it.
> 
> 
> 
> 
> Sent from my Galaxy S®III
> 
> -------- Original message --------
> From: Heiko Rosemann <heiko.rosemann@xxxxxx> 
> Date:04/04/2014  5:23 PM  (GMT-06:00) 
> To: kicad-developers@xxxxxxxxxxxxxxxxxxx 
> Subject: Re: [Kicad-developers] Diode pad names? 
> 
> Signed PGP part
> On 04/04/2014 10:45 PM, Carl Poirier wrote:
> > I think this is a very good idea. I will add this to our upcoming
> > KiCad library convention. Many transistors use letters already.
> 
> I do not agree for footprints, because - at least if I understand the
> proposal correctly - it will lead to many many different footprints of
> the same housing, i.e. an SOT23-EBC, an SOT23-SGD (for FETs), an
> SOT23-CBE, an SOT23-A1-C-A2, an SOT23-A1-C1A2-C2 etc. pp. with all the
> same dimensional data but different pad names.
> 
> I came to kicad from Eagle some years ago and I still believe
> distinguishing between symbol-package-device to be the best solution
> for this problem.
> 
> > As for capacitors, why not also using C and A for cathode and
> > anode?
> 
> In my experience, the terminals of a capacitor are not called cathode
> and anode.
> 
> YMMV,
> Heiko
> 
> > On Fri, Apr 4, 2014 at 2:24 PM, jp charras <jp.charras@xxxxxxxxxx
> > <mailto:jp.charras@xxxxxxxxxx>> wrote:
> >
> > Le 04/04/2014 20:02, Nick Østergaard a écrit :
> >> 2014-04-04 19:24 GMT+02:00 Dick Hollenbeck <dick@xxxxxxxxxxx
> > <mailto:dick@xxxxxxxxxxx>>:
> >>>
> >>>
> >>> I am in the process of migrating my personal footprint an
> > schematic part libraries to
> >>> using A and C for pad/pin names.
> >>>
> >>> Away from 1 and 2.
> >>>
> >>> Other than the fact that I now have the burden of maintaining
> > every footprint and
> >>> schematic part object myself relating to all things diode,
> >>> from
> > now to eternity, is this a
> >>> bad idea?
> >
> > Since a long time, I am using A and K (or C for you) for diodes,
> > EBC for bipolar transistors and GSD for FETs.
> >
> > I suggest you to also use + and - for polarized capacitors.
> 
> 
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