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Ann Craig is an adjunct professor and intercultural communications specialist who has lived and worked internationally. Her expertise is in the facilitation and design of programs on intercultural communications and presentation skills, the management of multisite training projects, and situation analysis and intervention. She can be reached at annscraig@aol.com.

BOM and AVL Component packages and logical Nets Outerlayer copper lands Solder mask, solder paste, and legend layers Drilling and routing layers Documentation layers Physical Nets Outer copper layers (non-lands) Innerlayers Nondocument miscellaneous layers Instructions and specifications Component tuning and programming instructions, program files, and/or references thereof

This format contains information not available in the earlier formats (including details about personnel and the enterprise, material requirements, and component tuning and programming). Most industry tools lack these items in their internal formats, so at this point these sections are usable primarily in human-readable form. Future evolution and market acceptance of IPC-2581 depend on committee work and vendor implementation and could well take several more years.

Component Information BOM and AVL files do not usually follow any global standard, but rather conform to the internal standards of each organization. Their format may be simple ASCII or a spreadsheet (see Fig. 18.18). Interpretation of BOM and AVL files requires either manual or semi-automatic parsing followed by conversion into a known supported format. This process might entail creation of templates that recognize various types of BOM and AVL files and translate them semi-automatically. BOM and AVL files are sometimes combined in a single BOM/AVL file that lists reference designators to be placed and part-ordering information. Figure 18.19 is a typical AVL file sample as seen in already-tabulated format. The line numbers are not part of the file. Lines 1 through 5 are header lines and lines 6 through 15 are data lines. There are two types of data lines; line 1 contains column headers for the first line type, and line 3 contains column headers for the second line type. Lines 6 and 12 are lines of the first type, representing functional devices (usually referred to as customer part

A number of different industry standards can be used to evaluate copper-clad laminate properties. Many of the test methods for similar properties are very comparable, though, and in the end the materials engineer must decide which standard to use as a basis for his or her characterization. In some cases, it may even be necessary to define a new characterization method to qualify a laminate material for a specific customer application or a particular requirement.

IPC-TM-650 This document is the most comprehensive and most widely used compilation of copper-clad laminate test methods. It is administered by IPC (Association Connecting Electronic Industries) and available in print or online.*

Most of the test methods described in this chapter are based on the test manual IPC-TM650. It contains industry-approved test techniques and procedures for chemical, mechanical, electrical, and environmental tests on all forms of printed wiring and connectors. An IPC test method is a procedure by which the properties or constituents of a material, an assembly of materials, or a product can be examined. These test procedures do not contain acceptability levels for specific properties.

IPC Specification Sheets IPC publishes a wide variety of technical specification sheets for PCB and printed circuits assembly (PCA) products. A few are important in this context:

IPC 4101, Specifications for Base Materials for Rigid and Multilayer Printed Boards, Rev. B 06/06 This document contains specification sheets for laminate materials used to manufacture PCBs for commercial and military applications. The minimum requirements for key material properties can be found in these specification sheets. IPC 4103, Specification for Plastic Substrates, Clad or Unclad, for High Speed/High Frequency Interconnections, 01/02 This document contains specification sheets for Teflon (polytetrafluoroethylene, or PTFE) and other laminate materials used to manufacture PCBs for high-speed or high-frequency applications. IPC 4104, Specification for High-Density Interconnect (HDI) and Microvia Materials, 05/99 This document contains specification sheets for materials used in HDI and microvia applications.

ASTM The American Society for Testing and Materials (ASTM) develops standard test methods and specifications that are in some cases related to laminate materials. They will be referenced as appropriate. More information can be found online.*