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Solder Paste for BGAs

Olek

Is solder paste required for soldering of BGAs?

BGAs "pins" are solder alloy balls that melt during the soldering, so I wonder if solder paste is needed.

I'm creating footprint for the BGA (1mm pitch, 576 pins) and I wonder if the padstack pad on  solder paste layer should be defined.

In other words, should solder paste stencil have openings for BGA "pins"?

  • redwire

    Yes.  Amount? That depends.  Check with your assembler on what they want.

    Remember that not all BGAs use eutectic balls.

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