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How to create library part with thermal pad?

Former Member

Hi there,

 

I was hoping someone could give me the recommended flow for creating a

library package with a thermal pad.  I'm using an LME49600TS/NOPBLME49600TS/NOPB which has 5

pins and a thermal pad.  The pad is electrically connected internally

to Vee.

 

I initially tried just marking a tStop region in the shape of the pad

hoping that if I just drew a polygon over it in the layout editor and

hit ratsnest, all would work out.  All I got was a polygon around the

pad not connected to it.

 

I then tried to draw a polygon in the package and name it something but

I discovered you can't name polygons.  A square pad would work I guess

but this isn't the shape of the pad which is in the shape of a 'T'.

 

Any pointers on the correct way of doing this?  The demo board doesn't

have the pad polygon connected to the Vee pin so that shouldn't be an

issue.

 

Thanks, Shareef.

 

 

  • in reply to Former Member

    Olin Lathrop wrote:

    warrenbrayshaw wrote on Mon, 26 September 2011 16:48

    >> The request is for documentation and CAD drawings practices  and not

    >> the spines of books,

     

    As I said before, down-reading vertical text is a strong convention

    here. The book spines are merely a way to illustrate this and point

    out that there really is a difference.

     

    You're not going to find a standard document, but the fact that's how

    it's done here should be good enough.  I don't know what fraction of

    Eagle users are in the US, but that's got to be a significant number.

     

    --

    I too would have guessed there were a large number US resident Eagle users

    but alas not one has responded to confirm your assertions.

     

    I was only curious. I went looking for an example and found none. I was not

    asking for a standard document, just a link to a document or attachment that

    provides anecdotal evidence that the convention exists beyond individuals

    choosing to use that practice. You are requesting the feature and have not

    in the interrum provided examples.

     

    To me it seems that Cadsoft would be justified in not catering for it as the

    business case has not been made.

     

    Warren

     

    Viewed / responded via the newsgroup at

    news.cadsoft.de

     

     

     

  • in reply to Former Member

    warrenbrayshaw wrote on Mon, 26 September 2011 18:20

    I too would have guessed there were a large number US resident Eagle

    users

    but alas not one has responded to confirm your assertions.

     

    I don't think many people watch these forums, particularly in the US where

    they are not well known.  Haven't you noticed that particularly the NNTP

    users are disproportionately European?  Also note that nobody from the US

    has disagreed with me either.  Most people don't want to use NNTP,

    Element14 is widely disliked, and few people know about Eagle Central.

     

    I can tell you that I've mentioned this to others and have pointed people

    to my TEXTFLIP ULP that tries to fix vertical text after the fact.

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

  • in reply to Former Member

    On 09/27/11 01:42, Olin Lathrop wrote:

    warrenbrayshaw wrote on Mon, 26 September 2011 18:20

    >> I too would have guessed there were a large number US resident Eagle

    >> users

    >> but alas not one has responded to confirm your assertions.

     

    I don't think many people watch these forums, particularly in the US where

    they are not well known.  Haven't you noticed that particularly the NNTP

    users are disproportionately European?  Also note that nobody from the US

    has disagreed with me either.  Most people don't want to use NNTP,

    Element14 is widely disliked, and few people know about Eagle Central.

     

    I can tell you that I've mentioned this to others and have pointed people

    to my TEXTFLIP ULP that tries to fix vertical text after the fact.

     

    And I am still waiting for you to provide a

    concrete example of a diagram, data sheet

    or whatever (preferably, of course, a schematic diagram)

    that has vertical text reading downwards (or "from the left

    side"). Since this is, according to you, what everybody

    does in the US, it shouldn't be hard to come up with something.

     

    Klaus Schmidinger

    --

    _______________________________________________________________

     

    Klaus Schmidinger                       Phone: +49-8635-6989-10

    CadSoft Computer GmbH                   Fax:   +49-8635-6989-40

    Pleidolfweg 15                          Email:   kls@cadsoft.de

    D-84568 Pleiskirchen, Germany           URL:     www.cadsoft.de

    _______________________________________________________________

     

  • in reply to kcadsoft

    On 9/27/2011 12:16 AM, Klaus Schmidinger wrote:

    On 09/27/11 01:42, Olin Lathrop wrote:

    >> warrenbrayshaw wrote on Mon, 26 September 2011 18:20

    >>> I too would have guessed there were a large number US resident Eagle

    >>> users

    >>> but alas not one has responded to confirm your assertions.

    >>

    >> I don't think many people watch these forums, particularly in the US

    >> where

    >> they are not well known. Haven't you noticed that particularly the NNTP

    >> users are disproportionately European? Also note that nobody from the US

    >> has disagreed with me either. Most people don't want to use NNTP,

    >> Element14 is widely disliked, and few people know about Eagle Central.

    >>

    >> I can tell you that I've mentioned this to others and have pointed people

    >> to my TEXTFLIP ULP that tries to fix vertical text after the fact.

     

    And I am still waiting for you to provide a

    concrete example of a diagram, data sheet

    or whatever (preferably, of course, a schematic diagram)

    that has vertical text reading downwards (or "from the left

    side"). Since this is, according to you, what everybody

    does in the US, it shouldn't be hard to come up with something.

     

    Klaus Schmidinger

     

    I (in the US)  Like NNTP. Clear Concise, no frills and searchable.

     

  • I think you should use SinoGuide TCP110U thermal pad for test, one side with fiberglass reinforcement;  TCP110U has a 1.1 W/mK thermal conductivity for exceptionally low thermal resistance. Naturally tacky on one side for easy assembly,  A special resin material that is easy to pull from the liner and place in the application enhances handling.