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topic 9822

High throwing power in reverse pulse plating



I'm trying to find the correct parameters for reverse pulse plating for 3.2 m"m panels thick and aspect ratio of 11 at least. Until now I got throwing power of only 60% for these panels and big "dog bone". I would like to get hints.


Benny Minkowski
P.C.B - Migdal Haemek, Israel


You will probably find that there is no single PPR recipe that is agreed upon in the industry.

I have read in various publications that a 10 or 20 ms forward with 0.5 to 1 ms reverse is the timing target. Keep the ratio at 20:1. The range for current density is forward at current density X and reverse at 2.5 X to 3 X. Start at 20-30 ASF forward.

Don't be surprised if different cycles work best for different aspect ratios. And through-hole needs different cycles than blind vias. Your best source for exact recommendations is the plating bath vendor. Secondary source is the supplier of the power supply.

bill vins
Bill Vins
microwave & cable assemblies
Mesa (what a place-a), Arizona 

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