Courtesy of Peter Luniewski:
Below is a link to AN where most of parameters of power IGBT modules are described. There you will see what means Vcesat or Vces and other important parameters like Qq and how it is derived. As power semiconductor manufacturer follow IEC60747 standard especially IEC60747-9 and -15 which is dedicated to IGBT and isolated power semiconductor devices, all symbols are IEC conform and their meaning for any supplier is same. Some differences for minor parameters for Mitsubishi are different as they have not yet adjusted themselves to EU market completely.
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