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Polarized Electrolytic TH Capacitor

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jflagstad View Drop Down
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    Posted: 09 Feb 2015 at 2:25pm

I've notice that 3D models for electrolytic capacitors place the minus (stripe) side on the same side as pin 1 for radial type packages. 

We would usually associate the plus side with pin 1. 

Is there a way to configure this in the Library Expert so you can dictate which side is plus and which side is minus? (I am an Altium user if it matters).

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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 09 Feb 2015 at 2:53pm

Do you want the 3D STEP polarity on Pin 2?


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Post Options Post Options   Thanks (0) Thanks(0)   Quote jflagstad Quote  Post ReplyReply Direct Link To This Post Posted: 09 Feb 2015 at 3:15pm
Yes, I need a way to keep pin 1 on the left, and the stripe on the 3D model on the right.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote chrisa_pcb Quote  Post ReplyReply Direct Link To This Post Posted: 09 Feb 2015 at 3:47pm

If you import the STEP file manually, you should be able to specify a 180 degree rotation around the vertical axis. Since its centered on the origin, this should flip the stripe to the other side. Haven't tried it, but that should be a temp fix.

Its also feasible to do this in code, but I would need some UI to denote this is what was intended and its a very specialized use case. I'll run it by Jeff.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote jflagstad Quote  Post ReplyReply Direct Link To This Post Posted: 09 Feb 2015 at 3:57pm

Yep, importing the STEP itself with the 180deg. rotation works.  I guess I was looking for this orientation coming direct from the "CreateALibrary" script that I wouldn't have to modify.

I can also see the other side of this argument... that being we could just change our polarized capacitor symbol so the negative side is pin 1 and the positive side is pin 2. 

However, in our database library, we are using 1 symbol to many parts, so we wouldn't want to change that at this point. 

Having this as a configurable option in the UI would be desirable.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote chrisa_pcb Quote  Post ReplyReply Direct Link To This Post Posted: 09 Feb 2015 at 8:22pm

The other side of the argument is you simply add it manually, or rotate the model itself 180 after placement.

The issue I have is that for the FPX to handle it, the modification is so user specific to a single family that literally you're likely to be the only one that uses it. How many Radial Electrolytics are we talking?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote jflagstad Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 2015 at 10:24am

All of them :)

Rotating the STEP is fine; we can deal with the three seconds it takes to do that. 

I was merely looking for another solution other than a manual edit. 

Thanks.

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