Printed Circuit Design & Fab - November 2007 - (Page 31) 1 0.01 0 0.0001 1E-06 1E-08 1E-10 1E-12 1E-14 Effect Of Surface Plating Rate 0.0001 0.0002 0.0003 0.0004 0.0005 0.0006 Platting Ratio @ 50% Barrel Position Plating Ratio @ 50% Barrel Position Surface Plating Rate (grams/sec) Effect of Plating Bath Index 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 0.030 0.032 0.034 0.036 0.038 0.04 0.042 0.044 Plating Bath Index (cu ft/g) FIGURE 10. Effect of surface-plating rate on plating ratio. FIGURE 11. Effect of plating bath index on plating ratio. The effect of the hole diameter at the 50% barrel position is shown in FIGURE 6 followed by a similar graph for the aspect ratio as shown in FIGURE 7. The predicted effect of the other parameters on the minimal plating thickness is shown in FIGURES 8, 9, 10 and 11. Ed note: This article was originally presented at the IPC Expo conference, February 2007 in Los Angeles, CA. DR. LEE PARKER is president of JLP Consultants LLC. He can be reached at leep001@msn.com. Summary The analysis concludes that the conventional wisdom concerning the variables that drive an electroplating throughhole process is correct but incomplete. This analysis finds that, in addition to the aspect ratio, there are several other variables of equal importance that should also be considered. These variables and the magnitude of their impact on plating are listed in TABLE 2. PCD&F REFERENCES 1. Schlichting, Herman, Boundary Layer Theory, McGraw Hill Book Company. 2. Faraday’s Law, The Columbia Encyclopedia, Sixth Edition. 3. National Metals Finishing Resource, Bluebook, Pollution Prevention and Control Technologies for Plating Operations. We'll Be There, Will You? December 2008 March 4-5, 2008 Bringing you the best of PCB East and West www.pcbshows.com NOVEMBER 2007 PRINTED CIRCUIT DESIGN & FAB 31 http://www.pcbshows.com
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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