This part is a kind of semiconductor called IRFS730A.

Function of this product has Advanced Power MOSFET.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

Advanced Power MOSFET FEATURES Avalanche Rugged Technology Rugged Gate Oxide Technology IRFS730A BVDSS = 400 V RDS(on) = 1.0 Ω ID = 3.9 A TO-220F Lower Input Capacitance Improved Gate Charge Extended Safe Operating Area Lower Leakage Current : 10 µA (Max.) @ VDS = 400V Lower RDS(ON) : 0.765 Ω (Typ.) 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 Characteristic Drain-to-Source Voltage Continuous Drain Current (TC=25 C ) Continuous Drain Current (TC=100 C ) Drain Current-Pulsed Gate-to-Source Voltage Single Pulsed Avalanche Energy Avalanche Current Repetitive Avalanche Energy Peak Diode Recovery dv/dt Total Power Dissipation (TC=25 C ) Linear Derating Factor Operating Junction and Storage Tempe [ ... ]

IRFS730A PDF Datasheet Download