This part is a kind of semiconductor called 25N05.

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 25N05 ·FEATURES ·Drain Current ID= 25A@ TC=25℃ ·Drain Source Voltage- : VDSS= 50V(Min) ·Static Drain-Source On-Resistance : RDS(on) = 0.065Ω(Max) ·Fast Switching ·APPLICATIONS ·Switching regulators ·Switching converters,motor drivers,relay drivers ·ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER VALUE UNIT VDSS VGS Drain-Source Voltage Gate-Source Voltage-Continuous 50 ±30 V V ID Drain Current-Continuous 25 A IDM Drain Current-Single Plused 80 A PD Total Dissipation @TC=25℃ 60 W Tj Max. Operating Junction Temperature 150 ℃ Tstg Storage Temperature -55~150 ℃ ·THERMAL CHARACTERISTICS SYMBOL PARAMETER Rth j-c Thermal Resistance, Junction to Case MAX UNIT 1.25 ℃/ [ ... ]

25N05 PDF Datasheet Download