Russell,
Acid copper pulse plating involves the use of a pulse rectifier.  The
rectifier is capable of reversing the current periodically, hence the term
periodic pulse reverse (PPR).
The combination of, the manipulation of the pulsed wave and the additive
(brightner and carrier) gives superior copper thickness distribution on the
surface and in the PTH without the need to resort to low CD plating.
Advantages are in product quality and in productivity.
Drawbacks are cost of rectifier and the learning curve of all the new
parameters like forward and reverse current, duty cycle etc.
If you have very demanding parts Pulse Plating could be in your future.
George Milad
Technical Marketing Manager
The Shipley Company

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