Benefits are all positive.
1. Better warpage control through equal copper balance in the stackup
2. Better thermal conductivity (minimizes temperature extremes and hot
spots, and lowers associated mechanical stresses...increases life/reliability)
3. Stiffer (less flexing of PCB with vibration...avoids solder
crystallization and increases reliability)
4. Better shielding of internal signals (frequency for three skin depths
drops by a factor of four relative to 1-ounce copper)
5. Lowers net planar inductance for lower common-mode voltage generation;
hence, lowers radiated emissions
6. etc.
Mike Conn
Owner/Principal Consultant
Mikon Consulting
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