Original poster: humanb-at-chaoticuniverse-dot-com Mitsubishi has a interesting paper on their IGBT modules, I found it quite informative: http://www.chaoticuniverse-dot-com/webdoc2.htg/SSTC/Designs/My_ISSTC/powermos4_0.pdf http://209.210.231.220/webdoc2.htg/SSTC/Designs/My_ISSTC/powermos4_0.pdf Regards, David Trimmell