Printed Circuit Design & Fab - November 2007 - (Page 29) PLATING TABLE 2. Magnitude of influence of specific variables. Effect of PTH Diameter 1 0.01 0.0001 0.000001 0.00000001 Hole Diameter (mils) VARIABLE Aspect Ratio Hole Diameter Agitation Speed Bulk Concentration Surface Plating Rate (Current Density) Plating Bath Index MAGNITUDE OF INFLUENCE Square Square Square Super Linear Linear Linear Plating Ratio @ 50% Barrel Position FIGURE 6. Effect of PTH diameter on plating ratio. transferred at that electrode2 or: w = GIt The rate of deposition is then: w = GI • Plating Ratio @ 50% Barrel Position Effect of PTH Aspect Ratio 1 0 0.1 0.01 0.001 0.0001 Aspect ratio 2 4 6 8 10 12 14 16 (Eq. 7) Where w is the amount of material plated, G is a constant, I is the effective current and t is time. The effective current is primarily a function of the concentration of the plating solution. Normally, the concentration of the bulk bath is very near the maximum level, and the plating process is said to be 100% efficient, but as the concentration, decreases the effective current becomes3: c I = I o ( 1 − exp[ − k c ]) 0 (Eq. 8) FIGURE 7. Effect of aspect ratio on plating ratio. Faraday’s Law, the number of moles of material plated at a cathode is proportional to the number of moles of electrons Where: I0 is the total current supplied to the plating bath The Strong Silent Type Si l Integrity I t Signal I t it Interconnects with Rugged F t t ith R d Features www.samtec.com/ruggedsi NOVEMBER 2007 6640 SAM StrongSilent_PCDM.indd 1 PRINTED CIRCUIT DESIGN & FAB 9/19/07 1:09:25 PM 29 http://www.samtec.com/ruggedsi
Table of Contents Feed for the Digital Edition of Printed Circuit Design & Fab - November 2007 Printed Circuit Design & Fab - November 2007 Contents Our Line Market Watch Around the World Happenings ROI Packaging HDI Design and Fab Plating Design Tools Metric Design Productronica Product Preview Marketplace Ad Index The Signal Doctor Printed Circuit Design & Fab - November 2007 Printed Circuit Design & Fab - November 2007 - Printed Circuit Design & Fab - November 2007 (Page Cover1) Printed Circuit Design & Fab - November 2007 - Printed Circuit Design & Fab - November 2007 (Page Cover2) Printed Circuit Design & Fab - November 2007 - Printed Circuit Design & Fab - November 2007 (Page 1) Printed Circuit Design & Fab - November 2007 - Contents (Page 2) Printed Circuit Design & Fab - November 2007 - Contents (Page 3) Printed Circuit Design & Fab - November 2007 - Our Line (Page 4) Printed Circuit Design & Fab - November 2007 - Our Line (Page 5) Printed Circuit Design & Fab - November 2007 - Market Watch (Page 6) Printed Circuit Design & Fab - November 2007 - Market Watch (Page 7) Printed Circuit Design & Fab - November 2007 - Around the World (Page 8) Printed Circuit Design & Fab - November 2007 - Around the World (Page 9) Printed Circuit Design & Fab - November 2007 - Around the World (Page 10) Printed Circuit Design & Fab - November 2007 - Around the World (Page 11) Printed Circuit Design & Fab - November 2007 - Happenings (Page 12) Printed Circuit Design & Fab - November 2007 - Happenings (Page 13) Printed Circuit Design & Fab - November 2007 - ROI (Page 14) Printed Circuit Design & Fab - November 2007 - ROI (Page 15) Printed Circuit Design & Fab - November 2007 - Packaging (Page 16) Printed Circuit Design & Fab - November 2007 - Packaging (Page 16A) Printed Circuit Design & Fab - November 2007 - Packaging (Page 16B) Printed Circuit Design & Fab - November 2007 - Packaging (Page 17) Printed Circuit Design & Fab - November 2007 - Packaging (Page 18) Printed Circuit Design & Fab - November 2007 - Packaging (Page 19) Printed Circuit Design & Fab - November 2007 - HDI Design and Fab (Page 20) Printed Circuit Design & Fab - November 2007 - HDI Design and Fab (Page 21) Printed Circuit Design & Fab - November 2007 - HDI Design and Fab (Page 22) Printed Circuit Design & Fab - November 2007 - HDI Design and Fab (Page 23) Printed Circuit Design & Fab - November 2007 - HDI Design and Fab (Page 24) Printed Circuit Design & Fab - November 2007 - HDI Design and Fab (Page 24A) Printed Circuit Design & Fab - November 2007 - HDI Design and Fab (Page 24B) Printed Circuit Design & Fab - November 2007 - HDI Design and Fab (Page 24C) Printed Circuit Design & Fab - November 2007 - HDI Design and Fab (Page 24D) Printed Circuit Design & Fab - November 2007 - HDI Design and Fab (Page 25) Printed Circuit Design & Fab - November 2007 - HDI Design and Fab (Page 26) Printed Circuit Design & Fab - November 2007 - Plating (Page 27) Printed Circuit Design & Fab - November 2007 - Plating (Page 28) Printed Circuit Design & Fab - November 2007 - Plating (Page 29) Printed Circuit Design & Fab - November 2007 - Plating (Page 30) Printed Circuit Design & Fab - November 2007 - Plating (Page 31) Printed Circuit Design & Fab - November 2007 - Design Tools (Page 32) Printed Circuit Design & Fab - November 2007 - Design Tools (Page 33) Printed Circuit Design & Fab - November 2007 - Design Tools (Page 34) Printed Circuit Design & Fab - November 2007 - Design Tools (Page 35) Printed Circuit Design & Fab - November 2007 - Metric Design (Page 36) Printed Circuit Design & Fab - November 2007 - Metric Design (Page 37) Printed Circuit Design & Fab - November 2007 - Metric Design (Page 38) Printed Circuit Design & Fab - November 2007 - Metric Design (Page 39) Printed Circuit Design & Fab - November 2007 - Metric Design (Page 40) Printed Circuit Design & Fab - November 2007 - Metric Design (Page 41) Printed Circuit Design & Fab - November 2007 - Productronica Product Preview (Page 42) Printed Circuit Design & Fab - November 2007 - Productronica Product Preview (Page 43) Printed Circuit Design & Fab - November 2007 - Marketplace (Page 44) Printed Circuit Design & Fab - November 2007 - Marketplace (Page 45) Printed Circuit Design & Fab - November 2007 - Marketplace (Page 46) Printed Circuit Design & Fab - November 2007 - Ad Index (Page 47) Printed Circuit Design & Fab - November 2007 - The Signal Doctor (Page 48) Printed Circuit Design & Fab - November 2007 - The Signal Doctor (Page Cover3) Printed Circuit Design & Fab - November 2007 - The Signal Doctor (Page Cover4)
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