PCB Libraries Forum Homepage
Forum Home Forum Home > PCB Footprint Expert > Questions & Answers
  New Posts New Posts RSS Feed - No 3D STEP Polarity Marker on SOT23 Packages
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

No 3D STEP Polarity Marker on SOT23 Packages
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
Todd Manning View Drop Down
Active User
Active User


Joined: 25 Jul 2013
Location: Perth WA
Status: Offline
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.



Thanks
Todd
Back to Top
Back to Top
Tom H View Drop Down
Admin Group
Admin Group
Avatar

Joined: 05 Jan 2012
Location: San Diego, CA
Status: Offline
Points: 5718 		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.
Stay connected - follow us! X - LinkedIn
Back to Top
Todd Manning View Drop Down
Active User
Active User


Joined: 25 Jul 2013
Location: Perth WA
Status: Offline
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.

Thanks
Todd
Back to Top
Tom H View Drop Down
Admin Group
Admin Group
Avatar

Joined: 05 Jan 2012
Location: San Diego, CA
Status: Offline
Points: 5718 		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. 
Stay connected - follow us! X - LinkedIn
Back to Top
Todd Manning View Drop Down
Active User
Active User


Joined: 25 Jul 2013
Location: Perth WA
Status: Offline
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
Thanks
Back to Top
 Post Reply Post Reply

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.281 seconds.