This part is a kind of semiconductor called 40N25.

Function of this product has N-Channel MOSFET Transistor.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

INCHANGE Semiconductor isc N-Channel MOSFET Transistor isc Product Specification 40N25 ·FEATURES ·Drain Current ID= 40A@ TC=25℃ ·Drain Source Voltage- : VDSS= 250V(Min) ·Static Drain-Source On-Resistance : RDS(on) = 0.08Ω(Max) ·Fast Switching ·APPLICATIONS ·Switching power supplies,converters,AC and DC motor controls ·ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER VALUE UNIT VDSS VGS Drain-Source Voltage Gate-Source Voltage-Continuous 250 ±30 V V ID Drain Current-Continuous 40 A IDM Drain Current-Single Plused 160 A PD Total Dissipation @TC=25℃ 250 W Tj Max. Operating Junction Temperature 150 ℃ Tstg Storage Temperature -55~150 ℃ ·THERMAL CHARACTERISTICS SYMBOL PARAMETER MAX UNIT Rth j-c Rth j-a Thermal Resistance, Junction to Case 0.833 �� [ ... ]

40N25 PDF Datasheet Download