PCB Libraries Forum : Too many SOT 23s https://www.PCBLibraries.com/forum/ Tue, 07 Apr 2026 14:14:37 +0000 Wed, 31 Oct 2012 12:20:04 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=651 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Too many SOT 23s : Ok great thanks.The &#039;L50&#039;...]]> https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2246.html#2246 Author: DaveCowl
Subject: 651
Posted: 31 Oct 2012 at 12:20pm

Ok great thanks.

The 'L50' type of option to define lead length should be adequate to differentiate the two.

Cheers!
]]> Wed, 31 Oct 2012 12:20:04 +0000 https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2246.html#2246 <![CDATA[Too many SOT 23s : IPC-7351C will recommend the...]]> https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2245.html#2245 Author: Tom H
Subject: 651
Posted: 31 Oct 2012 at 11:51am

IPC-7351C will recommend the following -
 
 

n  Theoriginal IPC-7351 footprint naming convention does not include componenttolerances, thermal pad sizes, BGA Ball sizes or various pin assignments intoaccount. Therefore, the same component with different tolerances can produce adifferent land size and spacing with the same footprint name.

n  Afootprint name of SOP50P710X120-14N can have version A, B, C, D which donot indicate the variances.

n  Asyou add parts to your library and you encounter a duplicate footprint name dueto Thermal Pad size, Terminal Length Tolerance or Ball Size

1.    ThermalTab Size = SOP50P710X120-14NT300

·        T300 = ThermalPad 3.00 mm

2.    LeadLength Tolerance = SOP50P710X120-14NL50

·        L50 = Lead Length= 0.50 mm

3.    BallSize = BGA121C50P11X11_600X600X100NB23

·        B23 = BallDiameter 0.23 mm

n  Forcomponent mfr. recommended footprint drop the environment level character afterthe pin qty. - SOP50P710X120-14

]]> Wed, 31 Oct 2012 11:51:18 +0000 https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2245.html#2245 <![CDATA[Too many SOT 23s : Actually the maximum height...]]> https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2244.html#2244 Author: DaveCowl
Subject: 651
Posted: 31 Oct 2012 at 11:32am

Actually the maximum height are identical. Hence the problem with naming...

I guess I could change one to be 0.01 mm different, which would result in a different name...
]]> Wed, 31 Oct 2012 11:32:15 +0000 https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2244.html#2244 <![CDATA[Too many SOT 23s : The variances in &#034;b&#034;...]]> https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2243.html#2243 Author: Tom H
Subject: 651
Posted: 31 Oct 2012 at 10:08am

The variances in "b" and "L" will generate a different pad size and spacing. But the component Maximum Height value are different and that differentiates the footprint name.
 
]]> Wed, 31 Oct 2012 10:08:28 +0000 https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2243.html#2243 <![CDATA[Too many SOT 23s : I understand that - both of these...]]> https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2239.html#2239 Author: DaveCowl
Subject: 651
Posted: 31 Oct 2012 at 9:39am

I understand that - both of these parts are on the same board.

Essentially the same part, just with quite different tolerances and pin dimensions for 'b' and 'L'.


]]> Wed, 31 Oct 2012 09:39:05 +0000 https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2239.html#2239 <![CDATA[Too many SOT 23s : The object is to use the FPE...]]> https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2233.html#2233 Author: Tom H
Subject: 651
Posted: 30 Oct 2012 at 7:22pm

The object is to use the FPE FPX as a resource to Copy/Paste into you personal FPX. Your Company FPX should only contain parts your company uses.
 
]]> Tue, 30 Oct 2012 19:22:05 +0000 https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2233.html#2233 <![CDATA[Too many SOT 23s : I am sure that this has been...]]> https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2232.html#2232 Author: DaveCowl
Subject: 651
Posted: 30 Oct 2012 at 7:17pm


I am sure that this has been answered before but I can't seem to find it.

I have run up against two (only 2?) different SOT23-6 footprints (currently Maxim vs TI) with the same height and such so that the names of the library entries are the same.

FPX seems to keep both of them there... but what is going to happen if I do a mass export of land patterns?

It looks like I can manually edit the Footprint Name, so perhaps that is the place to start?

What is the accepted norm for naming (I recall A, B, etc. has fallen out of favour...).

Cheers!
]]> Tue, 30 Oct 2012 19:17:47 +0000 https://www.PCBLibraries.com/forum/too-many-sot-23s_topic651_post2232.html#2232