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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.

 

 

Parents

  • Well Mr Pearce,

    as much as I thank you for your help, I must admit that I am not as

    knowledgeable using Eagle as you might have thought I was. That is why I

    didn't understand (and still don't) why there are supposed to be holes in

    the tStop layer, what they do, nor how come it is one of the only two

    layers that are generated automaticall for a SMD pad. there might be

    something (or more than one thing) that I don't understand, that's obvious,

    but if I did know, then I obviously wouldn't be posting on this forum, eh?

     

    So, no need to insinuate something by saying that I need less syllables in

    order to understand, or telling me to read the help file when I don't even

    know specifically what to look for... It is hard to know what to look for

    when you think you've looked at everything you could think of, and then

    there's the things one doesn't think of...

     

    In any case your explanation did help me out. I shall try this polygon

    perimeter-delimitation method with the tRestrict layer.

     

    sincerely,

     

    Redcutlass

    --

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

     

  • in reply to Former Member

    On Wed, 30 Mar 2011, Owen wrote to us saying :

    >Well Mr Pearce,

    >as much as I thank you for your help, I must admit that I am not as

    >knowledgeable using Eagle as you might have thought I was.

     

    >So, no need to insinuate something by saying that I need less syllables in

    >order to understand

     

    I apologise for being snarky. However, please do not try to suggest that

    your inexperience with Eagle was under attack. I am actually very

    tolerant of "newbies". What set me off was that I was repeating Olin's

    earlier answer. I have less tolerance than I should of people who need

    to be told things twice. Sorry.

    --

    Rob Pearce                       http://www.bdt-home.demon.co.uk

     

    The contents of     | All power corrupts, but we need electricity.

    this message are    |

    purely my opinion.  |

    Don't believe a     |

    word.               |

     

  • in reply to Former Member

    Robert Pearce wrote on Thu, 31 March 2011 17:43

    On Wed, 30 Mar 2011, Owen wrote to us saying :

    >Well Mr Pearce,

    >as much as I thank you for your help, I must admit that I am not as

    >knowledgeable using Eagle as you might have thought I was.

    <snip>

    >So, no need to insinuate something by saying that I need less

    syllables in

    >order to understand

     

    I apologise for being snarky. However, please do not try to suggest

    that

    your inexperience with Eagle was under attack. I am actually very

    tolerant of "newbies". What set me off was that I was repeating Olin's

     

    earlier answer. I have less tolerance than I should of people who need

     

    to be told things twice. Sorry.

    --

    Rob Pearce                       http://www.bdt-home.demon.co.uk

     

    The contents of     | All power corrupts, but we need electricity.

    this message are    |

    purely my opinion.  |

    Don't believe a     |

    word.               |

     

    OK, I understand. Although not a newbie, I certainly am no expert, even

    though I use Eagle almost daily in my work. I guess each person's level of

    experience is ... subjective.

    I will try to read answers more carefully in the future as it is true that

    I missed one word which made a difference. I am guilty of this, it's

    happened before.

     

    cheers,

     

    Redcutlass

     

     

    ps: In any case I was able to properly design my footprints using the

    Restrict layer. Fabulous!

    --

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

     

Reply
  • in reply to Former Member

    Robert Pearce wrote on Thu, 31 March 2011 17:43

    On Wed, 30 Mar 2011, Owen wrote to us saying :

    >Well Mr Pearce,

    >as much as I thank you for your help, I must admit that I am not as

    >knowledgeable using Eagle as you might have thought I was.

    <snip>

    >So, no need to insinuate something by saying that I need less

    syllables in

    >order to understand

     

    I apologise for being snarky. However, please do not try to suggest

    that

    your inexperience with Eagle was under attack. I am actually very

    tolerant of "newbies". What set me off was that I was repeating Olin's

     

    earlier answer. I have less tolerance than I should of people who need

     

    to be told things twice. Sorry.

    --

    Rob Pearce                       http://www.bdt-home.demon.co.uk

     

    The contents of     | All power corrupts, but we need electricity.

    this message are    |

    purely my opinion.  |

    Don't believe a     |

    word.               |

     

    OK, I understand. Although not a newbie, I certainly am no expert, even

    though I use Eagle almost daily in my work. I guess each person's level of

    experience is ... subjective.

    I will try to read answers more carefully in the future as it is true that

    I missed one word which made a difference. I am guilty of this, it's

    happened before.

     

    cheers,

     

    Redcutlass

     

     

    ps: In any case I was able to properly design my footprints using the

    Restrict layer. Fabulous!

    --

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

     

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