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Glazer, Metallurgy of Low Temperature Lead-free Solders: A Literature Review, International Materials Review, vol 40, 1995, pp 65 93 39 H L Hvims, Adhesives as Solder Replacement for SMT, vols I and II, Danish Electronics, Light and Acoutics, Hoersholm, Denmark, January 1994 40 A Emerick, J Ellerson, J McCreary, R Noreika, C Woychik, and P Viswanadham, Enhancement of TSOP Solder Joint Reliability Using Encapsulation, Proceedings of the 43d Electronic Components and Technology Conference, IEEE-CHMT, 1993, pp 187 192 41 P Tobias and D Trindade, Applied Reliability, Van Nostrand Reinhold, New York, 1986 42 ASTM D 257-78, Standard Test Methods for DC Resistance or Conductance of Insulating Materials 43 Military specification for Printed Wiring Boards 44 Military standard test method for Electronic and Electrical Component Parts 45 P J Boddy, R H Delaney, J N Lahti, E F Landry, and R C.

Restrick, Accelerated Life Testing of Flexible Printed Circuits: Part I and II, 14th Annual Proceedings of the IEEE Reliability Physics Symposium, Las Vegas, Nev, April 20 22, 1976 46 K-L B Wun, M Ostrander, and J Baker, How Clean is Clean in PCA, Proceedings of Surface Mount International, San Jose, Calif, 1991, pp 408 418 47 K C Norris and A H Landzberg, IBM Journal of Research and Development, vol 13, 1969, p 266 48 For example, see J H Lau, Surface Mount Solder Joints Under Thermal, Mechanical, and Vibration Conditions, in The Mechanics of Solder Alloy Interconnects, D R Frear, H Morgan, S Burchett, and J Lau (eds), op cit, pp 361 415 49 E B Hakim, Acceleration Factors for Plastic Encapsulated Semiconductors, Solid State Technology, Dec 1991, pp 108 109..

ASM Electronic Materials Handbook, Vol. 1: Packaging, ASM International, Materials Park, Ohio, 1989. Frear, D. R., H. Morgan, S. Burchett, and J. Lau, The Mechanics of Solder Alloy Interconnects, Van Nostrand Reinhold, New York, 1994. IPC-A-600D, Acceptability of Printed Boards, August 1989.

IPC-A-610A, Acceptability of Electronic Assemblies, Feb. 1990. IPC-D-279, Design Guidelines for Reliable Surface Mount Technology Printed Board Assemblies, to be issued. IPC-SM-785, Guidelines for Accelerated Reliability Testing of Surface Mount Solder Attachments, Nov. 1992. de Kluizenaar, E. E., Reliability of Soldered Joints: A Description of the State of the Art, Soldering and Surface Mount Technology, Part I: no. 4, pp. 27 38; Part II: no. 5, pp. 56 66; Part III: no. 6, pp. 18 27, 1990. Lau, J. H. (ed.), Solder Joint Reliability, Van Nostrand Reinhold, New York, 1991. Lau, J. H. (ed.), Thermal Stress and Strain in Microelectronics Packaging, Van Nostrand Reinhold, New York, 1993. Lea, C., A Scientific Guide to Surface Mount Technology, Electrochemical Publications, Ayr, Scotland, 1988. Tummala, R. and E. J. Rymaszewski (ed.), Microelectronic Packaging Handbook, Van Nostrand Reinhold, New York, 1989.

The reliability and electrical functionality of electronic components is partially determined by the temperature at which they operateAs such, control of the component temperatures in the system is an important design consideration Factors that impact device temperatures include the power at which they operate, the air flow surrounding them, heat generation upstream to them, the environment in which the system operates (either indoors or outdoors), the system orientation (either vertical or horizontal), and a variety of printed circuit board (PCB) layout and design properties These PCB design factors include the design of the copper (Cu) traces contacting the components, the number and area of Cu planes that are connected to them, any thermal vias that might be designed between them and the spreading planes, the proximity of other devices that dissipate power, and any cuts in the thermally conducting layers.

Additional PCB features that impact the thermal performance of components include chassis screws, connectors, edge guides, and shields To control component temperatures, PCB factors that impact thermal energy flow must be considered in the design phase of the PCB layout These factors include many complex interactions that make application of simple equations to calculate system temperatures impossible For example, the historical equation used to calculate component temperatures from a thermal resistance parameter called Theta-ja (qja) as shown in Eq 171 is not applicable in modern systems This is stated clearly in the Joint Electron Device Engineering Council (JEDEC) standard for qja1 qja is not a constant It is a function of the PCB onto which the component is placed and can vary by a factor of two or more as a function of the PCB design layout Therefore, if component temperatures are calculated using Eq 17.