Solder joint failure history has generally been assumed to follow a straight line when plotted as a lognormal or 2parameter Weibull distribution. Test results presented here show that a deviation from straightline behaviour occurs at low percentage failure probabilities. This indicates that solder joint failure history is more correctly characterised as a 3parameter Weibull distribution with a failurefree period of life for true wearout failures. The solder joint failure distribution characteristic is also affected by applied strain. Lower strain, in addition to increasing median life, also improves the distribution such that the number of cyclestofirstfailure is increased compared with the median cyclestofailure. The ratio of cyclestofirstfailuremedian cyclestofailure and apparent Weibull slope increases as strain decreases in a predictable manner. The effects of part elevation, part size, solder joint volume and shape, conformal coating, temperature differential, and alternative board materials are also presented with test data showing the effect of variation of these parameters.
Soldering & Surface Mount Technology – Emerald Publishing
Published: Feb 1, 1994
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