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NEMA NEMA publishes standards on laminated thermosetting materials. The last published version is the LI 1-1998 Standard for Industrial Laminated Thermosetting Products, which includes the latest information concerning the manufacture, testing, and performance of laminated thermosetting products. Most copper-clad laminate materials are named according to NEMA grades, but it is important to understand that NEMA grades represent only material categories and not one individual material. One of the most commonly known material grades is FR-4, which is often thought of as a specific laminate material. This is not the case, however, as each NEMA grade represents a material class defined by properties that fall into a certain class. Thus, properties of different laminate materials from different suppliers that fall into the same class (FR-4, for example) may not be identical. More information can be found online.** (For a more detailed discussion of FR-4, see Sec. 6.4.)

Robert A. Deen III, M.Div., is the senior minister and director of the Greater Philadelphia Center for Spiritual Living in Paoli, Pennsylvania. He is a teacher, speaker, and facilitator, working with groups at home and abroad. His vision is to inspire and support people s personal transformation, thereby bringing about positive change in our world. For more information, visit www.rsiphiladelphia.org.

TABLE 12.1 NEMA Grade Material Designations and Properties NEMA grade XXXPC FR-2 FR-3 CEM-1 CEM-2 CEM-3 CEM-4 FR-6 G-10 FR-4 G-11 FR-5 Resin system Phenolic Phenolic Epoxy Epoxy Epoxy Epoxy Epoxy Polyester Epoxy Epoxy Epoxy Epoxy

Reinforcement Paper Paper Paper Paper-glass Paper-glass Glass matte Glass matte Glass matte Glass (woven) Glass (woven) Glass (woven) Glass (woven)

EXAMPLE 4-7 Show that c gab = 0 using (4.16).

Description Phenolic paper, punchable Phenolic paper, punchable, flame-resistant Epoxy paper, cold punchable, high insulation resistance, flame-resistant Epoxy paper core and glass on laminate surface, flame-resistant Epoxy paper core and glass on laminate surface Epoxy non-woven glass core and woven-glass surface, flame-resistant Epoxy non-woven glass core and woven-glass surface Polyester non-woven glass, flame-resistant Epoxy woven glass, not flame-resistant Epoxy woven glass, flame resistant High-temp epoxy, woven glass, not flame-resistant High-temp epoxy, woven glass, flame-resistant

NEMA Grades Table 12.1 shows technical and industrial laminate grades as they apply to the most important printed circuit board materials.

DESCRIPTION SPROM_ASSY cap, 1.0pF, sheet5 cap, cap, cap, cap, cap, 3.0pF, sheet6 4.0pF, sheet6 0.5pF, sheet5 100pF, sheet6 1000pF, sheet5

FIGURE 18.18 A typical spreadsheet-style BOM file containing the customer part number, part information, and reference designators.

4--------------------------------------------------------------------CAP CHIP 1PF 0.25PF 50V COG 0402 KEMET MURATA TI C0402C109C5GACTU GRM36COG010C050AQ GRM36COG010C050AQ

numbers [CPNs]). Lines 8 through10 and 14 and 15 are of the second type and represent alternative orderable part numbers (usually referred to as manufacturer part numbers [MPNs]). Line 6 translates as Part number XYZ00001 is a 1 Pico Farad chip capacitor of description CAP CHIP 1PF 0.25PF 50V COG 0402, whereas line 8 translates as to get the XYZ00001 functionality from Kemet Electronics Corporation, specify catalog number C0402C109C5GACTU.

Data exchange for PCB manufacturing must evolve in two directions:

Technology-based evolution Improved means of communication in a high pace, competitive global economy

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With the rapid advance of technology in the PCB industry, data exchange formats must adapt to include new information. For example, none of the CAD formats mentioned here and neither ODB++* nor IPC-2581 support buried resistors and capacitors out of the box, and therefore buried passive technology development is hindered by data communication errors and costs. Other technological challenges that need to be addressed are better integrated BOM, AVL, and CAD data packaging coming out of design houses, and tool support for specifications, standards, revision information, and ECO data in an online framework. With increasing trends toward globalization and supply chains, communication should be more than mere data exchange. The technology exists but is not yet utilized to its fullest extent. Online collaboration tools should replace file transfer. Means of maintaining issue lists and following up on their resolution would ensure that manufacturing requirements are met without compromising design integrity. Means of incrementally issuing design revisions without complete manufacturing reengineering would speed up prototype evolution.

1. Dean, Graham, A Review of Modern Photoplotting Formats, Electronics Manufacturing Tech-

2. Document 40101-S00-066A, Mania Barco Corporation. (http://members.optusnet.com.au/~eseychell/ rs274xrevd_e.pdf) 3. http://www.artwork.com/gerber/appl2.htm. 4. Mentor Graphics Fablink User s Manual. (www.mentor.com/) 5. ANSI/IPC-D-356, Institute for Interconnecting and Packaging Electronic Circuits, 3000 Lakeside Drive Bannockburn, IL, USA. 6. Valor ODB++ manual, available upon request from Paul Barrow at Paul.Barrow@valor.com; Tel, +972-8-9432430 (ext. 165); Fax, +972-8 9432429; Valor Computerized Systems, Ltd., P.O.

7. IPC-2581, Generic Requirements for Printed Board Assembly Products Manufacturing Description Data and Transfer Methodology ; IPC-258x and sectional requirements thereof, Institute for Interconnecting and Packaging Electronic Circuits, 3000 Lakeside Drive, Bannockburn, IL, USA.