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No 3D STEP Polarity Marker on SOT23 Packages
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Todd Manning View Drop Down
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Points: 49 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Todd Manning Quote  Post ReplyReply Direct Link To This Post Topic: No 3D STEP Polarity Marker on SOT23 Packages
    Posted: 14 Jun 2018 at 11:41pm
Hi,

When I create a footprint for a SOT23 package there is no pin 1 indicator on the 3D model. The pin 1 indicator on the silkscreen and assembly drawing appear, but that is it.



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Todd
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Tom H View Drop Down
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Points: 5717 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2018 at 6:43am
Component manufacturers do not put Polarity Marking on SOT23 packages. 

There are currently 3 pin pitches for SOT23 type packages - 
  1. 0.95 mm
  2. 0.65 mm
  3. 0.50 mm
Send us a picture of a SOT23 physical package with a polarity marker. 

You can Google search SOT23 Packages and you will not see any Polarity Marking.
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Todd Manning View Drop Down
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Points: 49 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Todd Manning Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2018 at 3:42pm
Hi Tom,

Thanks for the clarification. At some time in the past you must have included them as I have many SOT23 packages with the polarity marker. It doesn't worry me that its not there, it was just because I saw it on previous models that it concerned me that I had changed something for the indicator not to be there anymore.

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Todd
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Tom H View Drop Down
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Points: 5717 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2018 at 3:45pm
Yes, we originally had a Polarity Marker on SOT23, but when the industry produced a 0.50 mm pitch, there was no room on that micro-mini part. 

We did the research and found out that CM's do not have Polarity Indication on any SOT23, so we removed it. 
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Todd Manning View Drop Down
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Points: 49 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Todd Manning Quote  Post ReplyReply Direct Link To This Post Posted: 15 Jun 2018 at 3:59pm
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