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.4mm pitch BGA

Padmaster1

First time using .4mm pitch BGA's. Please share some of your via setup and routing stratagies.

 

Currently I have it setup with a 12/6 via in pad with 2.5 mil traces internal and 3.5 mil spacing to drilled hole.

Still trying to figure out how to make PWR/GND plane fill between vias.

  • redwire

     Microvia is the best choice here.  Check out pricing.  It's cheaper than you think.

    That way you can drop the gnd down a layer; spread the signals out;  blinds down a couple of signal layers.

    Mentor published some great articles on bga breakout that goes over strategies.

  • Cadpro2K

     Try this doc:

    http://www.streamlinecircuits.com/streamline/sales/bga.pdf

  • Cadpro2K

     Another good site:

    http://www.circuitree.com/Articles/Feature_Article/BNP_GUID_9-5-2006_A_10000000000000953428

  • Cadpro2K

     nother good one:

    http://focus.ti.com.cn/cn/lit/an/spraav1b/spraav1b.pdf

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