This part is a kind of semiconductor called SSP70N10A.

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 Lower Input Capacitance Improved Gate Charge Extended Safe Operating Area Lower Leakage Current : 10 µA (Max.) @ VDS = 100V Lower RDS(ON) : 0.018 Ω (Typ.) SSP70N10A BVDSS = 100 V RDS(on) = 0.023 Ω ID = 55 A TO-220 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) Ο Value 100 55 38.9 1 O Ο Units V A A V mJ A mJ V/ns W W/ C Ο 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) Ο 220 + _ 20 1 [ ... ]

SSP70N10A PDF Datasheet Download