Printed Circuit Design & Fab - November 2007 - (Page 20) HDI DESIGN AND FAB HDI VIA STRUCTURES EFFECT on PCB Design Flexibility, Constraints and Cost Microvias are more reliable than through holes, so adding HDI to the design can improve reliability and reduce cost. by HAPPY HOLDEN Meeting the predictable but challenging market-defined needs of high-density (HD) PCBs requires new flexible design approaches that provide higher I/O densities, higher performance and lower costs than previously available solutions. In this paper, the four common high-density interconnect (HDI) via architectures are compared to determine how well each meets these diametrically opposed requirements. The four via architectures to be examined are: ■ Drilled sequential lamination ■ Staggered sequential microvia build-up ■ Stacked sequential microvia build-up ■ Co-laminated any layer microvia build-up. The basis for comparison is looking at the complexity of the fabrication process and expected yields. Design for manufacturing (DfM) now focuses on yield management (YM), and via structure is a major contributor to yield loss. This is contrasted to the resulting density, design constrains and I/Os per square inch achieved. Yield issues are more difficult to pin down because they are dependent on a number of variables and are largely statistically driven (i.e., the greater the occurrence of a certain configuration, the greater the likelihood of a board failure). This paper will propose a simplification of the Wiebull Defect Density model as the basis for predicting the first-pass yield (FPY) of new HDI boards in manufacturing. Introduction An excellent way to describe interconnect complexity and FIGURE 1. The Interconnect Technology Map showing the effect of component density on PCB technologies. The “Region of Advanced Technologies” shows densities that will require sequential lamination or microvias. (Source: Printed Circuit Handbook1). 20 FIGURE 2. HDI technologies vintage chart (Source: Printed Circuit Handbook2). NOVEMBER 2007 PRINTED CIRCUIT DESIGN & FAB
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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