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Gragala
Joined: 23 Jul 2008
Posts: 2
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 24 Jul 2008 11:59 Glue layer |
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Hi,
I have read in the forum some information about glue layer, but I have a simple doubt.
If I need to add a glue layer for components on the botton surface, is possible to do it using Orcad?
I know that Allegro provides Filmask top and bottom layer that can be use for information like gold, glue...But can you find a similar layer in Orcad?
And the last question... In what part of the component the glue has to be applied? what are the specifications for the glue layer? does it depend on the manufacturer?
Thanks in advanced!
Regards,
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kender
Joined: 19 Jun 2005
Posts: 965
Helped: 70
Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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Anonymous_Ricky
Joined: 26 Dec 2006
Posts: 146
Helped: 7
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| 28 Jul 2008 9:06 Glue layer |
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hi,
glue layer is generally used for SMD components and is provided for each pad of the component.
you can provide glue layer pad size less 5-4 mils the actual pad size for very small packages you can provide it equal to the pad size.
Regards,
Ricky
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House_Cat
Joined: 21 Feb 2002
Posts: 1356
Helped: 275
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| 29 Jul 2008 0:23 Re: Glue layer |
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Anonymous_Ricky -
I think you got confused while answering this question. What you are describing is the paste layer for solder paste, not the glue layer.
The glue layer defines glue dots which are placed at the center of component bodies away from the soldering pads. Their purpose is to hold the component in place during soldering.
You normally define the glue dot location in the component footprint, using a mechancial layer. The mechanical layer Gerber is then identified as the glue mask layer for the fab and assembly house. Although there are some assembly houses that can use the pick and place centroid information for glue dot application - they don't want or need a special mask layer.
You can read a bit more about glue dots at : http://www.loctite.com/int_henkel/loctite/binarydata/pdf/elec_workingsurfacemountadhesives.pdf
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Anonymous_Ricky
Joined: 26 Dec 2006
Posts: 146
Helped: 7
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| 29 Jul 2008 7:05 Glue layer |
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Thanks House_cat,
yes I admit that I got his question wrong.
thanks for you help
Ricky
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