This part is a kind of semiconductor called D1556.

Function of this product has 2SD1556.

Manufacturers : Wing Shing Electronic

Image and pinout :

Some of the text within the PDF file :

2SD1556 NPN TRIPLE DIFFUSED PLANAR SILICON TRANSISTOR COLOR TV HORIZONTAL OUTPUT APPLICATIONS(Damper Diode BUILT IN) ! ! High Collector-Base Voltage(VCBO=1500V) High Speed Switching 2-16E3A 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 6 50 150 -50~150 Unit V V V A W ℃ ℃ 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 Condition VCE= 1400 V ,RBE= [ ... ]

D1556 PDF Datasheet Download