This part is a kind of semiconductor called BU2508DF.

Function of this product has NPN TRIPLE DIFFUSE PLANAR SILICON TRANSISTOR(COLOR TV HORIZONTAL OUTPUT APPLICATIONS).

Manufacturers : Wing Shing Computer Components

Image and pinout :

Some of the text within the PDF file :

BU2508DF COLOR TV HORIZONTAL OUTPUT APPLICATIONS(No Damper Diode) NPN TRIPLE DIFFUSE PLANAR SILICON TRANSISTOR TO-3PML ! ! High Collector-Base Voltage(VCBO=1500V) High Speed Switching ABSOLUTE MAXIMUM RATINGS (TA=25℃) Characteristic Collector-Base Voltage Collector-Emitter Voltage Emitter-Base voltage Collector Current (DC) Collector Dissipation (Tc=25℃) Junction Temperature Storage Temperature Symbol VCBO VCEO VEBO IC PC Tj Tstg Rating 1500 1500 6 5 50 150 -50~150 Unit V V V A W ℃ ℃ TERMINATIONS 1. BASE 2. COLLECTOR 1 2 3 3. EMITTER ELECTRICAL CHARACTERISTICS (TA=25℃) Characteristic Collector- Emitter Cutoff Current(VBE=0) Collector Cutoff Current Emitter Cutoff Current DC Current Gain Collector- Emitter Saturation Voltage Symbol ICES ICBO IEBO hFE VCE(sat) Test [ ... ]

BU2508DF PDF Datasheet Download