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Tribology Every material has frictional (tribologic) properties. Some are naturally lubricating, such as Sn-Pb alloys, and others are notably nonslippery, such as tin or copper. Copper is one of the least slippery of the surface finishes and typically requires more pressing force than Sn-Pb or gold finishes for a comparably sized hole. Tin s crystalline structure is also rather resistant to sliding. In some cases, extra attention to PTH finished hole size (FHS) is required. The PWB vendor should be alerted to the fact that holes are being placed in the board for press-fit, so FHS and surface finish conditions are appropriate for the press-fit component. In some cases, for some materials such as copper, the holes could be specified for the upper end of its FHS as expressed by the connector vendor to aid in insertion. FHS should be just that: the hole size after surface finish is applied. If tribologic forces are too great, then the PTH barrel can be pushed out of the board or otherwise damaged. Trial boards and pressing parameters should always be assessed before full manufacturing commences. Only very small changes or imperfections can interfere with the typically high yields of press-fit connections. As previously mentioned, recently the European Union exempted press-fit connectors from its RoHS legislation, allowing the use of Sn-Pb coatings on compliant tails. The Pb adds a small amount of lubricity, allowing for easier pressing into notably difficult surface finishes such as organic solderability preservative (OSP) copper.

PTH Barrel Finish Barrel finish can have a profound impact on the press-fit operation. If a PTH barrel is too thin or poorly sized for the compliant pin, the pin may pierce the barrel wall or break internal connections to it. OSP-copper finish since it is a watery, thin topical coating adds no appreciable thickness to the PTH lands or barrel, so its control in high-aspect-ratio holes is not an issue in terms of press-fitting. Electroless/immersion surface finishes are generally thin and self-limiting in thickness, and as with OSP-copper, there no appreciable change in PTH hole diameter adding little impact to the press-fit process. At the other end of the spectrum are hot air solder leveling (HASL) and electroplated finishes, which may add significant material to PTH barrel walls and annular rings. Too thick a HASL coating can lead to PTH barrel diameter reduction. During pressing, the press-fit pins may be overcompressed, causing them to yield and collapse beneath the connector rather

1 2

FIGURE 15.4 The same PBA can have a wide range of natural resonances depending on the mounting method, which is why shock and vibration concerns are a critical design consideration.

E Modulus of elasticity (type GF epoxy-glass) m Poisson s ratio a Longer dimension of the PBA b Narrower dimension of the PBA t Thickness of the PBA W Weight of the PBA including components D= where D is the plate bending stiffness.

1.378 104 MPa 0.12 (dimensionless) 200 mm 150 mm 1.6 mm 0.25 kg Et 3 12(1 m2)

A primary source is rsthand, unedited information. This can appear in the form of words, images, or objects generated at or near the time of the event being studied. A secondary source is interpreted, edited, or summarized information from the primary source.

(15.4)

(15.5)

(15.6)

Methods of Reinforcement and Snubbers Printed board assemblies are stiffened using one or more methods to raise the natural resonant frequency sufficiently above the shock and vibration threat. The most obvious is to change the method of retaining or mounting the PBA in the next higher level of assembly. Frequently, though, this may not be an acceptable option due to the resources and schedule changes that may be necessary for extensive redesign. However, some simpler modification in the design may meet requirements. Sometimes changing the plug-in PBA guide from a loose supportive guide to a tighter spring-loaded or clamping-type guide may be sufficient. Other methods are to add ribs or stiffeners, additional single-point mounting locations, or snubbers across the surfaces of the PBAs.

1. Donald R. J. White and Michel Mardiguian, EMI Control, Methodology and Procedures, Interference Control Technologies, emf-emi Control, 4th ed., Gainsville, Va., pp. 5.5 5.6. 2. Ruey-Beei Wu, Resistance Modeling of Periodically Perforated Mesh Planes in Multilayer Packaging Structures, IEEE Transactions on Components, Hybrids, and Manufacturing Technology, vol. 12, no. 3, September 1989, pp. 365 372. 3. G. L. Ginsberg, Engineering Packaging Interconnection System, Chap. 4 in Clyde F. Coombs, Jr. (ed), Printed Circuits Handbook 3d ed., McGraw-Hill, New York, 1988 pp. 4 17. 4. ANSI-YI4.5 Dimensioning and Tolerancing, American National Standards Institute, New York, (date of current issue). 5. Cyril M. Harris and Charles E. Crede (eds.), Shock and Vibration Handbook, vol. 1, McGraw-Hill, New York, 1961, p. 1 2. 6. Donald B. Barker, Chap. 9, in Handbook of Electronic Packaging Design, Michael Pecht (ed.), Marcel Dekker, Inc., New York, 1991, p. 550. 7. Dave S. Steinberg, Vibration Analysis for Electronic Equipment, 2d ed., John Wiley, New York, 1988.