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CTE (Coefficient of Thermal Expansion) mismatch between neighboring material can cause serious problems. For example, alumina substrate and FR-4 PC board have CTE difference of 13ppm/oC. If the size of the mismatched component is larger, the effect is more severe. For example, 10 mm long alumina component can be 20um longer if the temperature rises by 100oC.
PTM Published on: 2011-08-22
New Zealand