Aluminum Oxide (Al2O3) is an important ceramic for the electronics industry. Besides its use as a passivation layer on Silicon, the ceramic is often used as a carrier for thick and thin film passive components and for other small printed circuit boards. A relatively low cost is combined with a relatively high thermal conductivity, especially when compared to FR4 board material. … [Read more...]
The thermal conductivity of pure metals
As discussed previously in this section, the measurement of the thermal conductivity is notoriously difficult. The consequence is that, while the measurement accuracy by individual researchers is claimed to be of the order of 2%, laboratories participating in round-robin tests produce results differing from each other by 15% or more [1]. Even the measurement of pure metals is … [Read more...]
The coefficient of thermal expansion
This is the second technical data feature that deals with the coefficient of thermal expansion (CTE). The first technical data feature, incorporated in the September 1997 issue, covered semiconductor materials, leadframes and solder alloys. This issue will discuss the temperature dependence of the CTE and present data on other materials that are of importance to electronic … [Read more...]
Coefficient of thermal expansion
As complexity increases and dies and packages become even larger, temperature gradients also increase, leading to problems with thermal mismatch. Hence, thermomechanical analysis grows in importance. Apart from the temperature differences, the most important parameter describing thermally induced stress is the coefficient of thermal expansion (CTE, or °), expressed in units of … [Read more...]
Thermal resistance: an oxymoron?
Introduction Dark light, deafening silence, cruel kindness, living dead, fuzzy logic,honest politics. The adjectives seem to contradict the substantives; such afigure of speech is called an oxymoron. It will be argued within this articlethat 'thermal resistance' is also a serious candidate for this category, atleast if the concept is being applied without realizing the … [Read more...]
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