This part is a kind of semiconductor called K40H1203.

Function of this product has IKW40N120H3.

Manufacturers : Infineon

Image and pinout :

Some of the text within the PDF file :

IGBT High speed DuoPack: IGBT in Trench and Fieldstop technology with soft, fast recovery anti-parallel diode IKW40N120H3 1200V high speed switching series third generation Data sheet Industrial Power Control IKW40N120H3 High speed switching series third generation High speed DuoPack: IGBT in Trench and Fieldstop technology with soft, fast recovery anti-parallel diode Features: C TRENCHSTOPTM technology offering • very low VCEsat • low EMI • Very soft, fast recovery anti-parallel diode • maximum junction temperature 175°C • qualified according to JEDEC for target applications • Pb-free lead plating; RoHS compliant • complete product spectrum and PSpice Models: http://www.infineon.com/igbt/ G E Applications: • uninterruptible power supplies • welding converters [ ... ]

K40H1203 PDF Datasheet Download