This part is a kind of semiconductor called HFA9N90.
Function of this product has 900V N-Channel MOSFET.
Manufacturers : SemiHow
Image and pinout :
Some of the text within the PDF file :
HFA9N90 July 2013 BVDSS = 900 V HFA9N90 900V N-Channel MOSFET FEATURES Originative New Design Superior Avalanche Rugged Technology Robust Gate Oxide Technology Very Low Intrinsic Capacitances Excellent Switching Characteristics Unrivalled Gate Charge : 55 nC (Typ.) Extended Safe Operating Area Lower RDS(ON) ȍ 7S #9GS=10V 100% Avalanche Tested RDS(on) typ ȍ ID = 9.0 A TO-247 1 2 3 1.Gate 2. Drain 3. Source Absolute Maximum Ratings Symbol VDSS ID IDM VGS EAS IAR EAR dv/dt PD TJ, TSTG TL Drain-Source Voltage Drain Current Drain Current Drain Current Gate-Source Voltage Single Pulsed Avalanche Energy Avalanche Current Repetitive Avalanche Energy Peak Diode Recovery dv/dt TC=25 unless otherwise specified Parameter Value 900 Units V [ ... ]