This part is a kind of semiconductor called 13N50H.
Function of this product has N-CHANNEL MOSFET.
Manufacturers : KIA
Image and pinout :
Some of the text within the PDF file :
KIA SEMICONDUCTORS 13Amps，500V N-CHANNEL MOSFET 13N50H 1.Description The KIA13N50H N-Channel enhancement mode silicon gate power MOSFET is designed for high voltage, high speed power switching applications such as high efficiency switched mode power supplies, active power factor correction,electronic lamp ballasts based on half bridge topology 2. Features RDS(on)=0.48Ω @ VGS=10V Low gate charge ( typical 43nC) Fast switching capability Avalanche energy specified Improved dv/dt capability 3. Pin configuration Pin 1 2 3 4 1 of 5 Function Gate Drain Source Drain KIA SEMICONDUCTORS 13Amps，500V N-CHANNEL MOSFET 13N50H 4. Absolute maximum ratings Parameter Symbol Drain-source voltage Gate-source voltage Drain current continuous Drain current pulsed (note1) TC [ ... ]