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 BGA padstack PCB Editor 

Last post Mon, Nov 14 2011 6:05 AM by steve. 2 replies.
Started by KnowledgeSeek 13 Nov 2011 12:45 PM. Topic has 2 replies and 2075 views
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  • Sun, Nov 13 2011 12:45 PM

    BGA padstack PCB Editor Reply

    Hi,

    I'm fairly new to the OrCad package. I'm trying to create a footprint for a DDR2 IC (MT47H128M16RT-25E:C) I'm going to use in my system. This IC comes in a 84 ball BGA package with 0.45mm ball diameter. What padstack do I use?

    I'm using the Package Symbol Wizard. There is something called "Bgapad" in the padstack list, but it's not working, all I get when I'm done with the wizard is a polygon with no pins.

     

    Thanks for the help in advance :)

     

     

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    • Post Points: 5
  • Mon, Nov 14 2011 12:47 AM

    Re: BGA padstack PCB Editor Reply

    Well, for now, I'm using the 4MM_RD padstack, with a width of 15.75mils(0.4mm).. It's the same padstack used by the OMAP-L138 footprint that I'm using provided by TI. The balls on the L138 seem to have the same dimensions(or at least within the same range: tolerance levels of 0.55/0.45 on the L138, while the DDR2 IC only states ø= 0.45) with the same pitch(0.8mm).

    Someone please let me know if I'm way off. (I'm also fairly new to PCB design in general, as you might have guessed)

    • Post Points: 20
  • Mon, Nov 14 2011 6:05 AM

    • steve
    • Top 10 Contributor
    • Joined on Fri, Jul 18 2008
    • Woking, Surrey
    • Posts 1,243
    • Points 20,215
    Re: BGA padstack PCB Editor Reply

    The padstacks provided are just sample libraries. If you need a padstack of a different size then use the Pad Designer to create new ones. This way you can design a bga pad to suit. Have a look for c:\cadence\spb16.x\doc\algrolibdev\algrolibdev.pdf for details of pad and footprint creation.

    • Post Points: 5
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Started by KnowledgeSeek at 13 Nov 2011 12:45 PM. Topic has 2 replies.