This part is a kind of semiconductor called DTV1500HF.

Function of this product has CRT HORIZONTAL DEFLECTION HIGH VOLTAGE DAMPER DIODE.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

® DTV1500Hxx (CRT HORIZONTAL DEFLECTION) HIGH VOLTAGE DAMPER DIODE MAIN PRODUCTS CHARACTERISTICS IF(AV) VRRM VF (max) trr (max) 6A 1500 V 1.7 V 125 ns K A FEATURES AND BENEFITS High breakdown voltage capability High frequency operation Specified turn on switching characteristics Very fast recovery diode Low static and peak forward voltage drop for low dissipation Insulated package (ISOWATT220AC & TO-220FPAC): Insulating voltage = 2000V DC Capacitance = 12pF Planar technology allowing high quality and best electrical characteristics s s s s s s s A K TO-220FPAC DTV1500HFP A K ISOWATT220AC DTV1500HF DESCRIPTION High voltage diode especially designed for horizontal deflection stage in standard and high resolution displays for TV’s and monitors. This device is packaged in TO-220AC [ ... ]

DTV1500HF PDF Datasheet Download