How to create library part with thermal pad?

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

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On 3/30/2011 12:29 PM, Owen wrote:

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

Hi Redcutlass,

I'm sure Mr. Pearce didn't mean anything by it. To understand what the

tStop and bStop layers do you need to look at a PCB. Whenever you have

smd components, the pads of the components need to remain exposed once

the board is manufactured, otherwise they'll get covered with

soldermask(this is gives PCBs their classic green color) and you won't

be able to solder parts to the board.

The function of the tStop and bStop is to indicate what areas need to be

void of soldermask so that the copper pad can show through. This is why

features are automatically drawn on the tStop layer whenver you create

an smd pad for your package. These voids are what Olin referred to as

"holes", though I could see how that term could be confusing to a new user.

If you want the autorouter to avoid a certain area then as already

mentioned you would draw features in the appropriate restrict layer.

hth,

Jorge Garcia

On 3/30/2011 12:29 PM, Owen wrote:

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

Hi Redcutlass,

I'm sure Mr. Pearce didn't mean anything by it. To understand what the

tStop and bStop layers do you need to look at a PCB. Whenever you have

smd components, the pads of the components need to remain exposed once

the board is manufactured, otherwise they'll get covered with

soldermask(this is gives PCBs their classic green color) and you won't

be able to solder parts to the board.

The function of the tStop and bStop is to indicate what areas need to be

void of soldermask so that the copper pad can show through. This is why

features are automatically drawn on the tStop layer whenver you create

an smd pad for your package. These voids are what Olin referred to as

"holes", though I could see how that term could be confusing to a new user.

If you want the autorouter to avoid a certain area then as already

mentioned you would draw features in the appropriate restrict layer.

hth,

Jorge Garcia