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If the questioner is monopolizing your time, don t conclude by asking, Did I answer your question You can avoid giving a dominant person more airtime by simply giving a brief answer and moving on However, if you are teaching and a student is asking for a more thorough explanation, Did I answer your question is an appropriate response Rephrase your answer if asked a question you have previously answered Regardless of whether the questioner wasn t listening or you weren t clear in your explanation, attempt to help the questioner save face and not be embarrassed for repeating a question Here s an example Imagine that after you ve worked hard to explain your process, someone asks how you reached your conclusion You might respond this way: We reached our conclusion by working through the four steps I explained.

1 a3

57.6.3.3 Temperature, Humidity, Bias. The primary purpose of these tests is to identify surface insulation resistance (SIR) degradation due to corrosive materials left on the board from the assembly process or due to galvanic couples set up in the assembly process. The usual test procedure is to use SIR comb patterns on the PCB, and to subject the assembly to 85 C/85 percent relative humidity/ 20Vdc for 1000 h. The bias voltage is dependent on the test device or test vehicle chosen.

One acceleration model that is applied is the modified Eyring model, which was developed for moisture-induced corrosion in plastic packages: t50% = A exp where t50% A, B, C, and D Ea k T Hr V = = = = = = = Ea kT exp C Hr Dexp V B (57.4)

time at which 50 percent of parts have failed empirical constants thermal activation energy Boltzmann constant temperature in degrees Kelvin relative humidity reverse-biasing voltage41,46

The time to failure is also dependent on the concentration of ionic contaminants. The default industrial ionic contamination limit comes from MIL-STD-28809A; it is the equivalent of 3.1 g/cm2 of NaCl. For small plastic packages, enough data have been collected to show that an empirical acceleration factor for temperature and relative humidity AFT,Hr applies: AFT, H r = 2(T+Hr)test (T+Hr)service where AF = acceleration factor T = temperature in C Hr = relative humidity in percent46,49 (57.5)

The rule of thumb for the effect of reverse bias is very device-specific; the following relationship was established for 20-V Schottky diodes in SOT-23 packages:46 AFV = 7700 exp V 12.32

When both acceleration factors apply, the total acceleration factor is: AFtotal = (AFT, Hr )(AFV)

Reliability of electronic assemblies is a complex subject. This chapter has touched on only one aspect of the problem: understanding the primary failure mechanisms of printed circuit boards and the interconnects between these boards and the electronic components mounted on them. This approach provides the basis for analyzing the impact of design and materials choices and manufacturing processes on printed circuit assembly reliability. It also provides the foundation for developing accelerated testing schemes to determine reliability. It is hoped that the fundamental approach will enable the reader to apply this methodology to new problems not yet addressed in mainstream literature.

1. M. A. Oien, Methods for Evaluating Plated-Through-Hole Reliability, 14th Annual Proceedings of IEEE Reliability Physics, Las Vegas, Nev., April 20 22, 1976. 2. K. Kurosawa, Y. Takeda, K. Takagi, and H. Kawamata, Investigation of Reliability Behavior of Plated-Through-Hole Multilayer Printed Wiring Boards, IPC-TP-385, IPC, Evanston, Ill., 1981.

3 IPC-TR-579, Round Robin Reliability Evaluation of Small Diameter Plated Through Holes in Printed Wiring Boards, Institute of Interconnecting and Packaging Electronic Circuits, Lincolnwood, Ill The IPC recently initiated a second round robin study, the results of which should be available in about 1996 4 F Fehrer and G Haddick, Thermo-mechanical Processing and Repairability Observations for FR-4, Cyanate Ester and Cyanate Ester/Epoxy Blend PCB Substrates, Circuit World, vol 19, no 2, 1993, pp 39 44 5 D B Barker and A Dasgupta, Thermal Stress Issues in Plated-Through-Hole Reliability, in Thermal Stress and Strain in Microelectronics Packaging, J H Lau (ed), Van Nostrand Reinhold, 1993, pp 648 683 6 IPC-TM-650, Method 248 7 L D Olson, Resins and Reinforcements, in ASM Electronic Materials Handbook, Vol 1: Packaging, ASM International, Materials Park, Ohio, 1989, pp 534 537 8 DW Rice, Corrosion in the Electronics Industry, Corrosion/85, paper no.