custom componet pads?

Question

Hi, I've tried to search for help on this, but I suppose I'm going about it all wrong so I'm not getting anywhere.

I'm trying to make a mini ATO fuse holder package. here is link to datasheet: http://www.keyelco.com/pdfs/M55-prod09.pdf I couldn't find any libraries that already had a mini ATO fuse holder, so I tryied to make my own. The problem comes when I think I want to have one big pad for both pins on each side and this is the best I can come up with. It worked fine until I added the supply polygon pour and there's no connecting thermals. It showes a ratsnest line to the nearest pad on the same net. I could draw the thermals in hack style, but I'd like my devices that I make to work like thier supposed to. I also inserted the mounting detail from the datasheet. All I want is to use the parts with big pads on top and bottom that will connect to the power layer polygon around it. Thanks, Ben

Former Member · Answer

Hi Ben

This is a challenge with Eagle Version 5 (getting fixed somewhat in v6)

It's not clear if you have a two layer board or multilayer with internal

power layers. I'll assume a two layer board.

Have a look at my attachment

Build your package with 4 pads. Your symbol will need to have 4 pins.

You don't include the polygons for the top and bottom copper in the

library. You will draw these when you edit the board.

In the library I added, on a user defined layer, the outlines of the

polygons that you draw manually on the board. This assists with getting the

size right and acts as a reminder to do it.

Next, if you need to make the solder stop the size of this guiding polygon

it wont be created automatically so put areas representing the solder stop

on the tStop and bStop layers. This assumes you want an area larger than

the pads to solder to. Your thermal problem suggests you are happy with

just the pad soldered. In which case miss this step.

If this was a SMD part you would need to do the same for the Cream layers

as well.

Once the part is on the board draw the polygons on the Top and Bottom

layers, guided by the polygons from the library package.

Name these polygons the same as the signal on the pads they surround. With

Thermals set for the polygons the thermals will be created.

A long haul but your there.

Consider no thermals as they may be rated less than the rating of your

fuse.

HTH

Warren

ps. When adding files and images when posting at Element14 do not embed

them in-line. Attach them. as they are not visible on the official CadSoft

newsgroup forum or EagleCentral site.

Hopefully a fix for this is going to occur.

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