@inproceedings{SteffensSzaboLenzetal., author = {Steffens, Oliver and Szab{\´o}, Peter and Lenz, Michael and Farkas, G{\´a}bor}, title = {Thermal transient characterization methodology for single-chip and stacked structures}, series = {Semiconductor Thermal Measurement and Management Symposium, 2005}, booktitle = {Semiconductor Thermal Measurement and Management Symposium, 2005}, publisher = {IEEE}, issn = {1065-2221}, doi = {10.1109/STHERM.2005.1412198}, pages = {313 -- 321}, abstract = {High-power semiconductor packages typically exhibit a 3D heat flow, resulting in large lateral changes in chip and case surface temperature. For single-chip devices we propose to use an unambiguous definition for the junction-to-case thermal resistance as a key parameter, based on a transient measurement technique with much higher repeatability, also for very low thermal resistances compared to a two-point thermal resistance measurement. The technique is illustrated on thermal transient measurements of power MOSFETs. A comparison between different thermal coupling to the ambient is used to demonstrate the method's capability to reveal even subtle internal details of the package. The concept is extended to multichip and stacked-chip structures, where transfer impedances have to be introduced. Here, the dynamic properties of the package are important and complex impedance mapping is the proper way to characterize the package.}, language = {en} } @article{SzaboSteffensLenzetal., author = {Szab{\´o}, Peter and Steffens, Oliver and Lenz, Michael and Farkas, G{\´a}bor}, title = {Transient junction-to-case thermal resistance measurement methodology of high accuracy and high repeatability}, series = {IEEE Transactions on Components and Packaging Technologies}, volume = {28}, journal = {IEEE Transactions on Components and Packaging Technologies}, number = {4}, issn = {1521-3331}, doi = {10.1109/TCAPT.2005.859768}, pages = {630 -- 636}, abstract = {High-power packages show a characteristic three-dimensional heat flow resulting in large lateral changes in chip and case surface temperature. This paper proposes an unambiguous definition for the R/sub thJC/ junction-to-case thermal resistance as a key parameter of such packages based on a transient measurement technique ensuring high repeatability even at very low R/sub th/ values. The technique is illustrated on thermal transient measurements of high-power MOSFET devices. It is also presented how the same measurement results can be used for die attach quality analysis. Finally, a comparative method is shown for measuring the differences of R/sub th/ values among samples with many times higher resolution compared with a direct R/sub thJC/ measurement.}, language = {en} }