PCB Libraries Forum : Anyone Have Experience With SOT89

PCB Libraries Forum : Anyone Have Experience With SOT89 https://www.PCBLibraries.com/forum/ Mon, 20 Apr 2026 17:48:34 +0000 Fri, 12 Jul 2013 18:01:48 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=1015 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Anyone Have Experience With SOT89 : The SOT89 was one of the first...]]> https://www.PCBLibraries.com/forum/anyone-have-experience-with-sot89_topic1015_post3888.html#3888 Author: Tom H
Subject: 1015
Posted: 12 Jul 2013 at 6:01pm

The SOT89 was one of the first SMT components invented.

There is no real industry standard so every mfr. makes their own version.

For the Footprint creation I normally add 0.05 mm (2 mils) periphery around the component lead.

I don't understand the datasheet link you provided where the component lead is Q = 0.062" but the mfr. recommended pattern has the pad length 0.059" which is smaller than the lead. So I don't trust the datasheet.

The VPL only matches a specific mfr. part number with a footprint and there are dozens of different part numbers.

You are correct that the footprint in your picture with the VPL lead will short to the copper pour.

We have avoided creating a SOT89 component family for the Library Expert because pin 2 is irregular shaped and comes with many variations. This is one of those parts that you create once and never create it again (hopefully).

]]> Fri, 12 Jul 2013 18:01:48 +0000 https://www.PCBLibraries.com/forum/anyone-have-experience-with-sot89_topic1015_post3888.html#3888 <![CDATA[Anyone Have Experience With SOT89 : I am curious why all recommended...]]> https://www.PCBLibraries.com/forum/anyone-have-experience-with-sot89_topic1015_post3887.html#3887 Author: rickdehart
Subject: 1015
Posted: 12 Jul 2013 at 3:51pm

I am curious why all recommended footprints for SOT89 seem to allow the pins to overhang on the inside. I fear this could cause shorts.

Here is a Valor VPL review of the standard SOT89 footprint. Has anyone else experienced this?

I've also attached a datasheet - uploads/107/Case_style_Dimension_DF782.pdf

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