This part is a kind of semiconductor called K20H603.

Function of this product has IKW20N60H3.

Manufacturers : Infineon

Image and pinout :

Some of the text within the PDF file :

IGBT HighspeedDuoPack:IGBTinTrenchandFieldstoptechnology withsoft,fastrecoveryanti-paralleldiode IKW20N60H3 600Vhighspeedswitchingseriesthirdgeneration Datasheet IndustrialPowerControl IKW20N60H3 Highspeedswitchingseriesthirdgeneration HighspeedDuoPack:IGBTinTrenchandFieldstoptechnologywithsoft,fast recoveryanti-paralleldiode  Features: C TRENCHSTOPTMtechnologyoffering •verylowVCEsat •lowEMI •Verysoft,fastrecoveryanti-paralleldiode •maximumjunctiontemperature175°C •qualifiedaccordingtoJEDECfortargetapplications •Pb-freeleadplating;RoHScompliant •completeproductspectrumandPSpiceModels: http://www.infineon.com/igbt/ G E Applications: •uninterruptiblepowersupplies •weldingconverters �� [ ... ]

K20H603 PDF Datasheet Download