This part is a kind of semiconductor called BU2527AX.
Function of this product has Silicon NPN Power Transistor.
Manufacturers : Inchange Semiconductor
Image and pinout :
Some of the text within the PDF file :
INCHANGE Semiconductor isc Product Specification isc Silicon NPN Power Transistor BU2527AX DESCRIPTION ·Collector-Emitter Sustaining Voltage: VCEO(SUS)= 800V (Min) ·High Switching Speed APPLICATIONS ·Designed for use in horizontal deflection circuits of high resolution monitors. ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER VALUE UNIT VCES Collector- Emitter Voltage(VBE= 0) 1500 V VCEO Collector-Emitter Voltage 800 V VEBO Emitter-Base Voltage 7.5 V IC ICM Collector Current- Continuous 12 A Collector Current-Peak 30 A IB B Base Current- Continuous 8 A IBM Base Current-Peak Collector Power Dissipation @ TC=25℃ Junction Temperature 12 A PC 45 W ℃ ℃ TJ 150 Tstg Storage Temperature Range -55~150 SYMBOL PARAMETER Thermal [ ... ]