This part is a kind of semiconductor called IRFZ34N.
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 IRFZ34N FEATURES ·Advanced Process Technology ·Dynamic dv/dt Rating ·175°C Operating Temperature ·Fast Switching ·Fully Avalanche Rated DESCRIPTION ·Designed for use in switch mode power supplies and general purpose applications. ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER VDSS Drain-Source Voltage VGS Gate-Source Voltage-Continuous ID Drain Current-Continuous IDM Drain Current-Single Pluse PD Total Dissipation @TC=25℃ TJ Max. Operating Junction Temperature Tstg Storage Temperature VALUE UNIT 55 ±20 V V 26 A 100 A 56 W -55~175 -55~175 ℃ ℃ THERMAL CHARACTERISTICS SYMBOL PARAMETER Rth j-c Rth j-a Thermal Resistance, Junction to Case Thermal Resistance, Junction to A [ ... ]
IRFZ34N PDF Datasheet Download
